The second step in the scientific method is to

The second step in the scientific method is to Answer: Make a hypothes...

The first step in the scientific method is to

The first step in the scientific method is to Answer: Make observatio...

The chemical used to make cans and foil is

The chemical used to make cans and foil is Answer: Alumin...

Substances which prevent spoilage are called

Substances which prevent spoilage are called Answer: Antioxidan...

The substance released when tissues are injured are

The substance released when tissues are injured are Answer: Propagandi...

An abrasive used in toothpaste

An abrasive used in toothpaste Answer: Calcium carbona...

Any material used in or used by a chemical reaction is a

Any material used in or used by a chemical reaction is a Answer: Chemic...

A substance that consists of one type of matter and always has the same composition and properties is

A substance that consists of one type of matter and always has the same composition and properties is Answer: Chemica...

The cubic centimetre has the same volume as a

The cubic centimetre has the same volume as a A) cubic inch B) cubic liter C) milliliter D) centimeter E) cubic decimeter Answer: ...

What is the metric relationship between grams and micrograms?

What is the metric relationship between grams and micrograms? A) 1g=100 microgram B) 1g=1000000 mg C) 1g=0.000001 mg D) 1g=1000mg E) 1g=0.001 mg ...

Which of the following is the largest unit?

Which of the following is the largest unit? A) millimeter B) micrometer C) meter D) decimeter E) kilometer Answer: E ...

5.21 cm is the same distance as

5.21 cm is the same distance as A) 0.0521 m B) 52.1 dm C) 5.21 mm D) 0.00521 km E) 5210 m Answer: ...

Which of the followings has 3 significant figures?

Which of the followings has 3 significant figures? A) 0.005 m B) 510 m C) 0.510 m D) 0.051 m E) 5100 m Answer: ...

Significant figures are important because they indicate

Significant figures are important because they indicate A) accuracy of a measurement B) number of digits on a calculator C) number of measurements D)...

The measurement of the gravitational pull on an object is its

The measurement of the gravitational pull on an object is its A) volume B) weight C) mass D) length E) size Answer: ...

Which of the following is a measurement of mass in the metric system?

Which of the following is a measurement of mass in the metric system? A) millimeter B) centimeter C) kilogram D) Celsius E) meter Answer: ...

Which of the following is the basic unit of mass in the SI?

Which of the following is the basic unit of mass in the SI? A) pound B) kilogram C) milligram D) microgram E) gram Answer: ...

The metric unit for volume is the

The metric unit for volume is the A) meter B) quart C) liter D) pint E) centimeter Answer: ...

The metric base unit for length is the

The metric base unit for length is the A) meter B) inch C) millimeter D) kilometer E) foot Answer: ...

Written in scientific notation 0.00000033 is

Written in scientific notation 0.00000033 is A) 3.3 x 10^7 B) 3.3 x 10-7 C) 3.3 x 10^8 D) 3.3 x 10^-8 E) 3.3 Answer: ...

Written in scientific notation 8300 is

Written in scientific notation 8300 is A) 8.3 x 10^2 B) 8.3 x 10^3 C) 8.3 x 10^4 D) 8.3 x 10^-3 E) 8.3 x 10^-2 Answer: ...

Written in scientific notation, 540,000 is

Written in scientific notation, 540,000 is A) 0.54 x 10^6 B) 54 x 10^8 C) 5.4 x 10^-5 D) 5.4 x 10^5 E) 5.4 Answer: ...

16 is what percent of 80

16 is what percent of 80 A) 200% B) 20% C) 2% D) 5% E) 50% Answer: ...

12 is what percent of 36

12 is what percent of 36 A) 3% B) 30% C) 33% D) 330% E) 12% Answer: ...

Which of the following would not be part of a study plan to learn chemistry?

Which of the following would not be part of a study plan to learn chemistry? A) study a little everyday B) skip your instructors study hours C) form...

In order to enhance your learning in chemistry, you should not

In order to enhance your learning in chemistry, you should not A) study a little everyday B) form a study group C) go to office hours D) be an active...

One way to enhance your learning in chemistry is to

One way to enhance your learning in chemistry is to A) study a little everyday B) form a study group C) go to office hours D) be an active learner E)...

There is more traffic between 8 and 9 in the morning because most people start work at 9. This would be a

There is more traffic between 8 and 9 in the morning because most people start work at 9. This would be a A) observation B) hypothesis C) experiment D)...

You notice that there is more traffic between 8 and 9 in the morning. This would be a

You notice that there is more traffic between 8 and 9 in the morning. This would be a A) observation B) hypothesis C) experiment D) theory E) all...

Which of the following is a chemical?

Which of the following is a chemical? A) sugar B) heat C) light D) noise E) a wave Answer: ...

When a part of the body is injured, substances called _____ are released.

When a part of the body is injured, substances called _____ are released. A) aspirins B) pain relievers C) nitrogen oxides D) chlorofluorocarbons E)...

Titanium dioxide is a chemical used in toothpaste to

Titanium dioxide is a chemical used in toothpaste to A) make the paste white B) disinfect the toothbrush C) keep the paste from spoiling D) remove...

Sodium fluoroscope is a chemical used in toothpaste to

Sodium fluoroscope is a chemical used in toothpaste to A) make the paste white B) disinfect the toothbrush C) keep the paste from spoiling D) remove...

Which of the following is not a chemical?

Which of the following is not a chemical? A) salt B) water C) light D) carbon dioxide E) sugar Answer: ...

One example of a chemical used in toothpaste is

One example of a chemical used in toothpaste is A) chlorine B) sulfur C) carbon dioxide D) calcium carbonate E) sugar Answer: ...

In this list, which substance can be classified as a chemical?

In this list, which substance can be classified as a chemical? A) salt B) sleep C) cold D) heat E) temperature Answer: ...

Water H2O is an example of

Water H2O is an example of A) chemical B) solid C) wave D) electric charge E) element Answer: ...

A compound of sodium and oxygen has 58.96% Na and a molar mass of 77.98 g/mol. What is the molecular formula of the compound?

A compound of sodium and oxygen has 58.96% Na and a molar mass of 77.98 g/mol. What is the molecular formula of the compound? A) Na2O B) NaO C) NaO2 D)...

You combine 6.54g of Zn with oxygen and find a while powder, ZnxOy with a mass of 8.14g the empirical formula of the product is

You combine 6.54g of Zn with oxygen and find a while powder, ZnxOy with a mass of 8.14g the empirical formula of the product is A) ZnO B) Zn2O C)...

A hydrocarbon has the empirical formula CH2. If it's molar mass is 140.3 g/mol, what is its molecular formula?

A hydrocarbon has the empirical formula CH2. If it's molar mass is 140.3 g/mol, what is its molecular formula? A) CH2 B) C5H10 C) C8H15 D) C10H20...

All of the following statements regarding 57.1 g of octane, C8H18 are true except

All of the following statements regarding 57.1 g of octane, C8H18 are true except A) 57.1g is 0.5 mol of octane B) the compound has 84.1% C by weight C)...

The simplest carbohydrate is glyceraldehyde. It's empirical formula is CH2O and it's molar mass is 90.08 g/mol. The molecular formula is

The simplest carbohydrate is glyceraldehyde. It's empirical formula is CH2O and it's molar mass is 90.08 g/mol. The molecular formula is A) CH2O B)...

The formula of the hydrocarbon decane is C10H22. The empirical formula is

The formula of the hydrocarbon decane is C10H22. The empirical formula is A) CH2 B) C2H4 C) C5H11 D) C10H22 Answer: ...

Nitrogen and oxygen form a serious of oxides with the general formula NxOy. One of them has 46.67% N. The empirical formula for this oxide is

Nitrogen and oxygen form a serious of oxides with the general formula NxOy. One of them has 46.67% N. The empirical formula for this oxide is A) N2O B)...

Nickel silver is the name for various silver white alloys of copper, zinc and nickel (no silver). A 35.452g sample of nickel silver contained 12.5% nickel. What was the mass of the nickel in this sample?

Nickel silver is the name for various silver white alloys of copper, zinc and nickel (no silver). A 35.452g sample of nickel silver contained 12.5%...

Calculate the (mass) percentage of nitrogen, N, in dinitrogen trioxide N2O3 (Atomic weights in amu= N=14.01, O=16.00)

Calculate the (mass) percentage of nitrogen, N, in dinitrogen trioxide N2O3 (Atomic weights in amu= N=14.01, O=16.00) A) 40.00% B) 36.86% C) 18.43% D)...

Which answer best represents the (mass) percent composition of CO2?

Which answer best represents the (mass) percent composition of CO2? A) 50.0% C and 50.0% O B) 12.0% C and 88.0% O C) 27.3% C and 72.7% O D) 12.0%...

The molar mass of CH4 is 16 g/mol. Which represents the greatest number of molecules of CH4?

The molar mass of CH4 is 16 g/mol. Which represents the greatest number of molecules of CH4? A) 35 g B) 1.8 mol C) 12 g Answer: ...

What is the approximate molar mass of FeO, iron(II) oxide?

What is the approximate molar mass of FeO, iron(II) oxide? A) 56 g/mol B) 72 g/mol C) 896 g/mol Answer: ...

Which sample has the larger number of atoms?

Which sample has the larger number of atoms? A) 0.10 mol Al B) 1.3g Si C) 0.090 mol Fe D) 10.5g Fe E) 3.2g S Answer: ...

You have 0.25 mol of each of the following elements. Which one has the largest mass?

You have 0.25 mol of each of the following elements. Which one has the largest mass? A) Fe B) Al C) Zn D) Ca E) C Answer: ...

Which of the following elements has the larger molar mass?

Which of the following elements has the larger molar mass? A) K B) Ne C) As D) Fe E) Si Answer: ...

All of the following statements concerning ionic compounds are correct EXCEPT

All of the following statements concerning ionic compounds are correct EXCEPT A) as the ion charges increases, the attraction between the ions increases B)...

Sodium oxalate has the formula Na2C2O4. Based on this information the formula for iron(III) oxalate is

Sodium oxalate has the formula Na2C2O4. Based on this information the formula for iron(III) oxalate is A) FeC2O4 B) Fe(C2O4)2 C) Fe(C2O4)3 D) Fe2(C2O4)3 E)...

All of the formulas below are correct EXCEPT

All of the formulas below are correct EXCEPT A) Ba(NO3)2 B) KCIO4 C) Na3N D) Al2(SO4)3 E) Ca2HPO4 Answer: ...

Which one of the list is a molecular compound?

Which one of the list is a molecular compound? A) LiCl lithium chloride B) SO2 sulfur dioxide C) AlF3 aluminum fluoride D) Ba(NO3)2 barium nitrate E)...

Which compound formula and name in the list is NOT correct?

Which compound formula and name in the list is NOT correct? A) NaHSO4 sodium hydrogen sulfate B) CaH2PO4 calcium hydrogen phosphate C) FeCl3 iron(III)...

Which compound formula in the list is NOT correct?

Which compound formula in the list is NOT correct? A) CaSO4 calcium sulfate B) NaNO3 sodium nitrate C) MgI2 magnesium iodide D) NH4PO4 ammonium phosphate E)...

The formula of barium molybdate is BaMoO4. What is the formula of sodium molybdate?

The formula of barium molybdate is BaMoO4. What is the formula of sodium molybdate? A) Na4MoO B) Na2MoO3 C) Na4MoO4 D) NaMoO E) Na2MoO4 Answer:...

Which compound in the list below is NOT possible?

Which compound in the list below is NOT possible? A) K2NO3 B) CaSO4 C) Fe(CIO4)2 D) Na3PO4 E) LiHSO4 Answer: ...

Which compound in the following list is NOT possible?

Which compound in the following list is NOT possible? A) CaBr2 B) KI C) Al2O D) LiCl E) MgO Answer: ...

The ion CIO- has

The ion CIO- has A) 25 protons and 25 electrons B) 25 protons and 26 electrons C) 25 protons and 24 electrons D) 26 protons and 25 electrons E) 26...

Which of the following series contains only known nonmetal anions?

Which of the following series contains only known nonmetal anions? A) S2-, Br-, Al3+ B) N2-, I-, O2- C) P3-, F-, Se2- D) Cl-, Fe3+, S2- E) In+, Br2-,...

When the ion Sr2+ forms,

When the ion Sr2+ forms, A) the Sr atom loses 1 electron and now has the same number of electrons as Kr B) the Sr atom loses 1 electron and now has...

Which group of ions contains only ions you would predict as "stable"?

Which group of ions contains only ions you would predict as "stable"? A) Li2+, Fe2+, Ca2+ B) Mg3+, Cr3+, O2- C) Ca2+, Fe3+, Al3+ D) F2-, Al4+, Na...

Which ion in the following list is NOT likely to form?

Which ion in the following list is NOT likely to form? A) Na+ B) Mg3+ C) Al3+ D) Fe2+ E) Zn2+ Answer: ...

Which statement best describes the Ca^2+ ion?

Which statement best describes the Ca^2+ ion? A) the cation formed when an atom of calcium gains 2 electrons B) the cation formed when an atom of...

Which chemical property would you predict is likely for the elements Francium (Fe)?

Which chemical property would you predict is likely for the elements Francium (Fe)? A) it's oxide forms alkaline aqueous solutions B) it is likely...

Which element is an alkaline earth metal?

Which element is an alkaline earth metal? A) hydrogen B) aluminum C) lithium D) calcium E) radon Answer: ...

Which list of elements includes those in the same period or row of the periodic table?

Which list of elements includes those in the same period or row of the periodic table? A) Mg, Fe, Al B) Ti, B, Ge C) B, Al, TI D) Cl, Si, Sn E) Fe,...

Which list of elements includes those in the same periodic group?

Which list of elements includes those in the same periodic group? A) Mg, Fe, Al B) Ti, B, Ge C) B, Al, TI D) Cl, Si, Sn E) Fe, Co, Ni Answer:&n...

Bromine (Br) has two stable isotopes, ^79Br and ^81Br and ^79Br has an isotopic mass of 78.918 u and an abundance of 50.69%. What is the isotopic mass of ^81Br?

Bromine (Br) has two stable isotopes, ^79Br and ^81Br and ^79Br has an isotopic mass of 78.918 u and an abundance of 50.69%. What is the isotopic mass...

Which is likely the most abundant stable isotope of gallium (Ga)?

Which is likely the most abundant stable isotope of gallium (Ga)? A) ^69Ga B) ^71Ga C) Tm-169 D) Lu-175 E) ^67Ga (decay half life = 3.3 d by gamma...

Which statement describes the composition of an isotope of iron, ^58Fe?

Which statement describes the composition of an isotope of iron, ^58Fe? A) 26 neutrons, 32 protons, 26 electrons B) 32 neutrons, 26 protons, 26 electrons C)...

Of the three major subatomic particles, the least massive is

Of the three major subatomic particles, the least massive is A) proton B) electron C) neutron Answer: ...

How are chlorine-37 and calcium-40 similar?

How are chlorine-37 and calcium-40 similar? A) # of protons B) # of electrons C) # of neutrons D) no similarity Answer: ...

How are chlorine-37 and calcium-40 similar?

How are chlorine-37 and calcium-40 similar? A) # of protons B) # of electrons C) # of neutrons D) no similarity Answer: ...

Which of the following is true?

Which of the following is true? A) Boron-10 has 10 e B) Boron-11 has 11 n C) Boron-10 has 5 e D) Boron-11 has 11 p Answer: ...

A piece of a polypropylene rope floats on water, whereas a terephthalate polymer from a soda bottle sinks in water. What is the order of increasing density of these substances?

A piece of a polypropylene rope floats on water, whereas a terephthalate polymer from a soda bottle sinks in water. What is the order of increasing...

Which of the following is not a physical change?

Which of the following is not a physical change? A) freezing of a liquid to form a solid B) dissolving a solid in water to form a solution C) burning...

Which of the following is not a compound?

Which of the following is not a compound? A) salt B) water C) potassium D) sugar E) alcohol Answer: C) potassi...

Which of the following is not an element?

Which of the following is not an element? A. Hydrogen B. Lithium C. Iron D. Water E. Silver Answer: D. Wat...

Explain how a pure metal is held together. Include a definition of a metallic bond in your explanation.

Explain how a pure metal is held together. Include a definition of a metallic bond in your explanation. Answer: A piece of pure metal, such as...

Describe the trends in the atomic size of elements within groups and across periods in the periodic table. Provide examples.

Describe the trends in the atomic size of elements within groups and across periods in the periodic table. Provide examples. Answer: Atomic size...

Describe the trends in electromagnetically within groups and across periods in the periodic table. Provide examples.

Describe the trends in electromagnetically within groups and across periods in the periodic table. Provide examples. Answer: Electronegativity...

How many electrons does a gallium atom give up when it becomes an ion?

How many electrons does a gallium atom give up when it becomes an ion? Answer: ...

How many electrons are in a rubidium ion (Rb⁺)?

How many electrons are in a rubidium ion (Rb⁺)? Answer: ...

How many valence electrons are in silicon?

How many valence electrons are in silicon? Answer: ...

In 1829, the German chemist J. R. Dobereiner published a classification system in which elements were put into groups according to their properties. How many elements did he put in each of his groups?

In 1829, the German chemist J. R. Dobereiner published a classification system in which elements were put into groups according to their properties....

What is the coordination number of both ions in the cesium chloride crystal?

What is the coordination number of both ions in the cesium chloride crystal? Answer: ...

Give the electron configurations for iodine and its 1- ion.

Give the electron configurations for iodine and its 1- ion. Answer: I [Kr] 5s² 4d¹⁰ 5p⁵...

Which group of elements in the periodic table is known as the alkaline earths?

Which group of elements in the periodic table is known as the alkaline earths? Answer: ...

Write the formula for the compound rubidium phosphate.

Write the formula for the compound rubidium phosphate. Answer: Rb₃P ...

Which of the following elements is a transition metal?

Which of the following elements is a transition metal? a. tellurium b. tin c. copper d. cesium Answer: copp...

Which of the following statements correctly compares the relative size of an ion to its neutral atom?

Which of the following statements correctly compares the relative size of an ion to its neutral atom? a. The radius of an anion is greater than the...

By 1700, how many elements had scientists discovered and isolated?

By 1700, how many elements had scientists discovered and isolated? a. 27 b. 46 c. 13 d. 7 Answer: ...

What is the formula of the ion formed when potassium achieves noble-gas electron configuration?

What is the formula of the ion formed when potassium achieves noble-gas electron configuration? a. K⁻ b. K²⁻ c. K²⁺ d. K⁺ Answer: K⁺ ...

The metals in Groups 1A, 2A, and 3A

The metals in Groups 1A, 2A, and 3A a. gain electrons when they form ions. b. all form ions with a negative charge. c. all have ions with a 1 charge. d....

Most ionic compounds

Most ionic compounds a. conduct an electric current in the solid state. b. have low melting points. c. are composed of nonmetallic elements. d. are...

What is the electron configuration of the calcium ion?

What is the electron configuration of the calcium ion? Answer: 1s²2s²2p⁶3s²3...

Which of the following elements has the smallest atomic radius?

Which of the following elements has the smallest atomic radius? a. sulfur b. bromine c. selenium d. chlorine Answer: chlori...

Which of the following categories includes the majority of the elements?

Which of the following categories includes the majority of the elements? a. metals b. liquids c. nonmetals d. metalloids Answer: meta...

Alloys are important because

Alloys are important because a. they never corrode. b. they are less expensive to produce than their component elements. c. their properties are a...

Which of the following is true about the melting temperature of potassium chloride?

Which of the following is true about the melting temperature of potassium chloride? a. The melting temperature is relatively high. b. The melting...

Which statement is true about electromagnetically?

Which statement is true about electromagnetically? a. Electronegativity is the ability of an anion to attract another anion. b. Electronegativity...

What is the net charge of the ionic compound calcium fluoride?

What is the net charge of the ionic compound calcium fluoride? a. 2- b. 0 c. 1- d. 1+ Answer: ...

How many valence electrons does a helium atom have?

How many valence electrons does a helium atom have? a. 2 b. 4 c. 3 d. 5 Answer: ...

How many electrons does nitrogen gain in order to achieve a noble-gas electron configuration?

How many electrons does nitrogen gain in order to achieve a noble-gas electron configuration? a. 1 b. 4 c. 2 d. 3 Answer: ...

To what category of elements does an element belong if it is a good conductor of electricity?

To what category of elements does an element belong if it is a good conductor of electricity? a. halogens b. metals c. metalloids d. nonmetals ...

Of the elements Fe, Hg, U, and Te, which is a representative element?

Of the elements Fe, Hg, U, and Te, which is a representative element? a. Fe b. U c. Hg d. Te Answer: ...

Which of the following factors contributes to the decrease in ionization energy within a group in the periodic table as the atomic number increases?

Which of the following factors contributes to the decrease in ionization energy within a group in the periodic table as the atomic number increases? a....

Which of the following factors contributes to the increase in ionization energy from left to right across a period?

Which of the following factors contributes to the increase in ionization energy from left to right across a period? a. an increase in the number of...

What is the charge on the cation in the ionic compound sodium sulfide?

What is the charge on the cation in the ionic compound sodium sulfide? a. 1+ b. 3+ c. 0 d. 2+ Answer: ...

How many valence electrons are transferred from the nitrogen atom to potassium in the formation of the compound potassium nitrite?

How many valence electrons are transferred from the nitrogen atom to potassium in the formation of the compound potassium nitrite? a. 3 b. 2 c. 1 d....

What is the element with the lowest electromagnetically value?

What is the element with the lowest electromagnetically value? a. helium b. calcium c. cesium d. fluorine Answer: cesi...

As you move from left to right across the second period of the periodic table

As you move from left to right across the second period of the periodic table a. ionization energy increases. b. atomic radii increase. c. electronegativity...

What characteristic of metals makes them good electrical conductors?

What characteristic of metals makes them good electrical conductors? a. Their crystal structures can be rearranged easily. b. They have mobile protons. c....

How does oxygen obey the octet rule when reacting to form compounds?

How does oxygen obey the octet rule when reacting to form compounds? a. It does not change its number of electrons. b. Oxygen does not obey the octet...

Explain the difference between the Celsius and Kelvin temperature scales.

Explain the difference between the Celsius and Kelvin temperature scales. Answer: Both scales use the freezing point and boiling point of water...

How did Lavoisier transform the field of chemistry in the late 1700s?

How did Lavoisier transform the field of chemistry in the late 1700s? Answer: Lavoisier helped transform chemistry from a science of observation...

Define element and compound. Explain the difference between an element and a compound.

Define element and compound. Explain the difference between an element and a compound. Answer: An element is the simplest form of matter that...

How many grams of liquid are produced when 34 grams of ice melt?

How many grams of liquid are produced when 34 grams of ice melt? Answer: ...

What is the boiling point of water in degrees Celsius?

What is the boiling point of water in degrees Celsius? Answer: 100...

What is the density of an object having a mass of 4.0 g and a volume of 39.0 cubic centimetres?

What is the density of an object having a mass of 4.0 g and a volume of 39.0 cubic centimetres? Answer: Density = Mass/Volume = 4.0 g/39.0 cm³...

Which field of science studies the composition and structure of matter?

Which field of science studies the composition and structure of matter? a. geology b. biology c. physics d. chemistry Answer: Chemistr...

Which of the following best describes an example of applied chemistry?

Which of the following best describes an example of applied chemistry? a. perfecting a method for producing nylon fibres b. determining the structure...

What must be done to be certain that a chemical change has taken place?

What must be done to be certain that a chemical change has taken place? a. Demonstrate that a release of energy occurred after the change. b. Check...

Which substance has a chemical symbol that is derived from a Latin name?

Which substance has a chemical symbol that is derived from a Latin name? a. hydrogen b. potassium c. calcium d. oxygen Answer: Potassiu...

The chief advantage of the metric system over other systems of measurement is that it ____.

The chief advantage of the metric system over other systems of measurement is that it ____. a. is derived from nature itself b. has more units c....

The step that usually comes first in solving numeric problems is ____.

The step that usually comes first in solving numeric problems is ____. a. analyze b. calculate c. measure d. evaluate Answer: Analy...

How many significant figures are in the measurement 0.003 4 kg?

How many significant figures are in the measurement 0.003 4 kg? a. two b. This cannot be determined. c. four d. five Answer: T...

In a chemical reaction, the type of products obtained is largely determined by which part of the reacting chemicals?

In a chemical reaction, the type of products obtained is largely determined by which part of the reacting chemicals? a. neutrons b. protons c. electrons d....

If a liter of water is heated from 20C to 50C, what happens to its volume?

If a liter of water is heated from 20C to 50C, what happens to its volume? a. The volume increases. b. The volume first increases, then decreases. c....

Which of the following statements is false?

Which of the following statements is false? a. Knowledge of chemistry helps prepare people for careers in soil science. b. Studying chemistry ensures...

There are many reasons to study chemistry. In general, most people study chemistry for all of the following reasons EXCEPT?

There are many reasons to study chemistry. In general, most people study chemistry for all of the following reasons EXCEPT? a. Knowledge of chemistry...

Which of the following equalities is correct?

Which of the following equalities is correct? a. 10 kg =1 g b. 1000 mm = 100 m c. 100 cg = 10 g d. 1 cm³ = 1 mL Answer: 1 cm³ = 1 ...

Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of 7.32 g for the mass of the standard. These results imply that the balance that was used is ____.

Three different people weigh a standard mass of 2.00 g on the same balance. Each person obtains a reading of 7.32 g for the mass of the standard. These...

The chemical formula of a compound indicates

The chemical formula of a compound indicates a. the source of the elements in the compound. b. the relative proportions of the elements in the compound. c....

The weight of an object ____.

The weight of an object ____. a. is not affected by gravity b. is the same as its mass c. is always the same d. depends on its location Answer: Depends...

Chlorine boils at 239K. What is the boiling point of chlorine expressed in degrees Celsius?

Chlorine boils at 239K. What is the boiling point of chlorine expressed in degrees Celsius? a. -34°C b. -61°C c. 93°C d. 34°C Answer: -34...

Which of the following is a chemical property of water at 4°C?

Which of the following is a chemical property of water at 4°C? a. its color b. its state c. its temperature d. its ability to decompose into hydrogen...

Which of the following is a chemical change?

Which of the following is a chemical change? a. grating cheese b. melting cheese c. mixing two cheeses in a bowl d. fermenting of cheese Answer: fermenting...

Which of the following is an example of chemistry research in the main area of energy?

Which of the following is an example of chemistry research in the main area of energy? a. specific reactions between prescription drugs and chemicals...

When an iron nail rusts, its mass ____.

When an iron nail rusts, its mass ____. a. stays the same b. decreases c. increases d. cannot be determined Answer: increas...

Which of the following measurements is expressed to three significant figures?

Which of the following measurements is expressed to three significant figures? a. 0.070 mm b. 7077 mg c. 0.007 m d. 7.30 x 10⁻⁷ km? Answer: 7.30...

How many significant figures are in the measurement 811.40 grams?

How many significant figures are in the measurement 811.40 grams? a. two b. three c. four d. five Answer: Fi...

Which of the following is a homogeneous mixture?

Which of the following is a homogeneous mixture? a. oil in vinegar b. alcohol in water c. pasta in water d. muddy water Answer: alcohol in...

Which of the following is a homogeneous mixture?

Which of the following is a homogeneous mixture? a. soil b. beef stew c. sand and water d. salt water Answer: saltwat...

A horizontal row of the periodic table is usually referred to as a

A horizontal row of the periodic table is usually referred to as a a. period. b. family. c. property. d. group. Answer: peri...

A central concept of the kinetic theory, one of the "big ideas" of chemistry, is the belief that

A central concept of the kinetic theory, one of the "big ideas" of chemistry, is the belief that a. every chemical process uses or produces energy,...

How many positive charges are there in the nucleus of a nitrogen atom?

How many positive charges are there in the nucleus of a nitrogen atom? Answer: ...

What is the name of the element with no neutrons?

What is the name of the element with no neutrons? Answer: Hydrog...

What is the symbol of the element found in 1.0% of the human body?

What is the symbol of the element found in 1.0% of the human body? Answer: ...

How many neutrons are in the nucleus of an oxygen atom?

How many neutrons are in the nucleus of an oxygen atom? Answer: 8 neutro...

What is the Atomic Mass of oxygen?

What is the Atomic Mass of oxygen? Answer: 16 a.m....

Atomic Mass is made up of what two particles?

Atomic Mass is made up of what two particles? Answer: Protons and Neutro...

How many protons does carbon have?

How many protons does carbon have? Answer: 6 proto...

What is the Atomic Number of carbon?

What is the Atomic Number of carbon? Answer: ...

What is the symbol of the element that makes up 9.5% of the human body?

What is the symbol of the element that makes up 9.5% of the human body? Answer: ...

What is the name of the element that makes up 9.5% of the human body?

What is the name of the element that makes up 9.5% of the human body? Answer: Hydrog...

What is the name of the least abundant element found in the human body?

What is the name of the least abundant element found in the human body? Answer: Sulf...

The effects of cosmetics and beauty products are based on how _________.

The effects of cosmetics and beauty products are based on how _________. Answer: the body reacts to chemica...

Everything you can touch and everything you can see is matter EXCEPT for which of the following?

Everything you can touch and everything you can see is matter EXCEPT for which of the following? Answer: Light and electrici...

Acid-alkali neutralization reactions occur when an acid is mixed with an alkali in equal proportions, balancing the total pH and forming water (H2O) and _________.

Acid-alkali neutralization reactions occur when an acid is mixed with an alkali in equal proportions, balancing the total pH and forming water (H2O)...

Which of the following is defined as any substance that occupies space and has weight?

Which of the following is defined as any substance that occupies space and has weight? Answer: Matt...

The Safety Data Sheet (SDS) replaced the _________.

The Safety Data Sheet (SDS) replaced the _________. Answer: Material Safety Data Sheet (MSD...

______ is an example of a compound molecule.

______ is an example of a compound molecule. Answer: Exposed metal rusti...

During combustion of a substance, _________ accompanies the rapid oxidation.

During combustion of a substance, _________ accompanies the rapid oxidation. Answer: the production of heat and lig...

What is the pH scale used to measure?

What is the pH scale used to measure? Answer: Acidity and alkalinity ...

An oxidizing agent _________ oxygen.

An oxidizing agent _________ oxygen. Answer: releas...

______ is the simplest form of chemical matter.

______ is the simplest form of chemical matter. Answer: An eleme...

If you left the freezer door open all night at work, all of the ice you had in the freezer for after hair removal services would probably melt. This would be a result of _________.

If you left the freezer door open all night at work, all of the ice you had in the freezer for after hair removal services would probably melt. This...

A solute is a _________.

A solute is a _________. Answer: substance that is dissolved in a soluti...

Creams, lotions, masks, and makeup _________.

Creams, lotions, masks, and makeup _________. Answer: contain chemicals whether they come from natural sources or from ingredients manufactured...

How many categories are all SDSs are formatted into?

How many categories are all SDSs are formatted into? Answer: ...

When salt is dissolved into water, _________.

When salt is dissolved into water, _________. Answer: salt is the solute and water is the solve...

In the uniform order of the SDS, _________ comes immediately after the first category of "Identification."

In the uniform order of the SDS, _________ comes immediately after the first category of "Identification." Answer: Hazard Identificati...

Estheticians should study and have a thorough understanding of chemistry because _________.

Estheticians should study and have a thorough understanding of chemistry because _________. Answer: every product used in the esthetics industry...

A reducing agent _________.

A reducing agent _________. Answer: adds hydrogen to a chemical compou...

Understanding pH is important for the esthetician because _________.

Understanding pH is important for the esthetician because _________. Answer: it affects the hair, skin, and nai...

What is pH is an abbreviation of?

What is pH is an abbreviation of? Answer: Potential hydrog...

Among the following choices, acids would MOST likely be used to _________.

Among the following choices, acids would MOST likely be used to _________. Answer: exfoliate the sk...

Which of the following should you be sure to do when mixing chemicals?

Which of the following should you be sure to do when mixing chemicals? Answer: Use a measuring device, such as a measuring cup or spoo...

If you were the owner of the local spa, why would it be so important that you insist that for every chemical used there is an SDS available?

If you were the owner of the local spa, why would it be so important that you insist that for every chemical used there is an SDS available? Answer: Because...

There are _________ elements are known to science today.

There are _________ elements are known to science today. Answer: 1...

If your client requests that you use a solution that is neutral to his skin, which of the following pHs should you be using?

If your client requests that you use a solution that is neutral to his skin, which of the following pHs should you be using? Answer: A pH of...

_______ for the disposal of many of the chemicals used in salons or spas.

_______ for the disposal of many of the chemicals used in salons or spas. Answer: Most states and counties do not have regulations in pla...

A solvent is any _________.

A solvent is any _________. Answer: substance that dissolves a solute and makes a soluti...

What do miscible liquids form when they are combined?

What do miscible liquids form when they are combined? Answer: Suspensio...

There are _________ accepted pictograms included in all SDSs.

There are _________ accepted pictograms included in all SDSs. Answer: ...

SDSs are designed for _________.

SDSs are designed for _________. Answer: use in an emergen...

Which of the following are defined as the basic units of matter?

Which of the following are defined as the basic units of matter? Answer: Ato...

Which of the following is capable of igniting and burning?

Which of the following is capable of igniting and burning? Answer: A combustib...

What is the name of the branch of chemistry dealing with compounds that do not contain the element carbon?

What is the name of the branch of chemistry dealing with compounds that do not contain the element carbon? Answer: inorganic chemist...

What is the process through which oxygen is subtracted from, or hydrogen is added to, a substance through a chemical reaction?

What is the process through which oxygen is subtracted from, or hydrogen is added to, a substance through a chemical reaction? Answer: reduc...

What is a solute?

What is a solute? Answer: any substance that is dissolved by a solvent to form a soluti...

What are chemical combinations of two or more atoms of different elements called?

What are chemical combinations of two or more atoms of different elements called? Answer: compound molecul...

Approximately how many naturally occurring elements are there?

Approximately how many naturally occurring elements are there? Answer: ...

What is an atom or molecule that carries an electrical charge?

What is an atom or molecule that carries an electrical charge? Answer: i...

Antioxidants prevent oxidation by neutralizing what?

Antioxidants prevent oxidation by neutralizing what? Answer: free radica...

What is matter that has fixed volume but no definite shape?

What is matter that has fixed volume but no definite shape? Answer: liqu...

Why must theoreticians understand basic chemistry?

Why must theoreticians understand basic chemistry? Answer: To use professional products effectively and safe...

What is the most abundant element on Earth?

What is the most abundant element on Earth? Answer: Oxyg...

What are acids?

What are acids? Answer: substances with a pH below 7...

What is an example of something we can see that is NOT matter?

What is an example of something we can see that is NOT matter? Answer: lig...

What is an example of an oil-in-water emulsion?

What is an example of an oil-in-water emulsion? Answer: moisturiz...

What is the simplest form of matter?

What is the simplest form of matter? Answer: eleme...

What is the natural pH of the skin?

What is the natural pH of the skin? Answer: 5...

What occurs when an acid is mixed with an alkali in equal proportions to form water and a salt?

What occurs when an acid is mixed with an alkali in equal proportions to form water and a salt? Answer: acid-alkali neutralization reacti...

What is the chemical reaction involving the addition of oxygen or the loss of hydrogen?

What is the chemical reaction involving the addition of oxygen or the loss of hydrogen? Answer: oxidati...

Most skin care products are emulsions of what?

Most skin care products are emulsions of what? Answer: oil and wat...

The logarithmic scale is a method of displaying data in multiples of what?

The logarithmic scale is a method of displaying data in multiples of what? Answer: ...

Salons and spas primarily use what kind of emulsions?

Salons and spas primarily use what kind of emulsions? Answer: oil-in-wat...

What would be the molar solubility of Li3PO4 (Ksp = 2.37 x 10-4) in a 1M LiCl solution?

What would be the molar solubility of Li3PO4 (Ksp = 2.37 x 10-4) in a 1M LiCl solution? a) 1.54 x 10^-2 b) 5.44 x 10^-2 c) 2.37 x 10^-4 d) 1.24 x...

A solution of AgI contains 1.9 M Ag+. Ksp of AgI is 8.3 x 10-17. What is the maximum I- concentration that can exist in this solution?

A solution of AgI contains 1.9 M Ag+. Ksp of AgI is 8.3 x 10-17. What is the maximum I- concentration that can exist in this solution? a) 1.9 M b)...

CaSO4 has a Ksp = 3x10-5. In which of the following would CaSO4 be the most soluble?

CaSO4 has a Ksp = 3x10-5. In which of the following would CaSO4 be the most soluble? a) 1.0 M CaCl2(aq) b) 0.5 M K2SO4(aq) c) pure water d) CaSO4...

Determine if a precipitate will form when 0.96g Na2CO3 is combined with 0.2g BaBr2 in a 10L solution. (For BaCO3, Ksp = 2.8x10-9).

Determine if a precipitate will form when 0.96g Na2CO3 is combined with 0.2g BaBr2 in a 10L solution. (For BaCO3, Ksp = 2.8x10-9). a) BaCO3 does not...

A hypothetical compound MX3 has a molar solubility of 0.00562 M. What is the value of Ksp for MX3?

A hypothetical compound MX3 has a molar solubility of 0.00562 M. What is the value of Ksp for MX3? a) 2.69 x 10^-8 b) 9.48 x 10^-5 c) 3.16 x 10^-5 d)...

Rank the following salts from least to most molar solubility:

Rank the following salts from least to most molar solubility: BiI Ksp = 7.7x10-19 Cd3(AsO4)2 Ksp = 2.2x10-33 AlPO4 Ksp = 9.8x10-21 CaSO4 Ksp = 4.9x10-5 a)Cd3(AsO4)2...

Determine the molar solubility of some salt with the generic formula AB2 if Ksp = 2.56x102.

Determine the molar solubility of some salt with the generic formula AB2 if Ksp = 2.56x102. a) 1 M b) 4 M c) 0.1 M d) 10 M Answer: b) 4...

The value of Ksp for SrSO4 is 2.8x10-7. What is the solubility of SrSO4 in moles per liter?

The value of Ksp for SrSO4 is 2.8x10-7. What is the solubility of SrSO4 in moles per liter? a) 5.3 x 10^-4 b) 1.4 x 10^-7 c) 2.8 x 10^-7 d) 7.6 x...

A hypothetical ionic substance T3U2 ionizes to form T2+ and U3- ions. The solubility of T3U2 is 4.04x10-20 mol/L. What is the value of the solubility-product constant?

A hypothetical ionic substance T3U2 ionizes to form T2+ and U3- ions. The solubility of T3U2 is 4.04x10-20 mol/L. What is the value of the solubility-product...

Pure water is saturated with PbCl2. In this saturated solution, which of the following is true?

Pure water is saturated with PbCl2. In this saturated solution, which of the following is true? a) Ksp = [Pb2+]2[Cl-] b) [Pb2+] = [Cl-] c) Ksp = [Pb2+][Cl-] d)...

The Ksp eqution for sodium bicarbonate (NaHCO3) should be written as:

The Ksp eqution for sodium bicarbonate (NaHCO3) should be written as: a) Ksp = [NaH2+][CO32-] b) Ksp = [Na+][H+][CO32-] c) Ksp = [Na+][H+][C4+][O2-]3 d)...

Molar solubility is

Molar solubility is a) the total molarity of the solution. b) equal to the Ksp. c) the number of moles that dissolve to give one liter of super-saturated...

What ions are present in solution after aqueous solutions of Cu(NO3)2 and K2S are mixed? Assume we mixed stoichiometric equivalent amounts of both reactants and 100% reaction.

What ions are present in solution after aqueous solutions of Cu(NO3)2 and K2S are mixed? Assume we mixed stoichiometric equivalent amounts of both reactants...

What is the net ionic equation for the reaction between aqueous solutions of Na3PO4 and CuSO4?

What is the net ionic equation for the reaction between aqueous solutions of Na3PO4 and CuSO4? a) 3Cu2+ + 2PO43- --> Cu3(PO4)2 b) 2Na+ + SO42-...

Red blood cells contain Na+ ions, K+ ions, and water. If we place some red blood cells into a beaker full of pure water, what will happen to them?

Red blood cells contain Na+ ions, K+ ions, and water. If we place some red blood cells into a beaker full of pure water, what will happen to them? a)...

Which of the following statements is TRUE?

Which of the following statements is TRUE? a) There is no net flow of H2O molecules from one solution to another. b) There is a net flow of Cl- ions...

Catalase (a liver enzyme) dissolves in water. A 14mL solution containing 0.166g of catalase exhibits an osmotic pressure of 1.2 Torr at 20°C. What is the molar mass of catalase?

Catalase (a liver enzyme) dissolves in water. A 14mL solution containing 0.166g of catalase exhibits an osmotic pressure of 1.2 Torr at 20°C. What is...

A semi-permeable membrane can withstand an osmotic pressure of 0.75 atm. What molarity of aqueous magnesium bromide solution would reach the limit for this membrane? (Assume RT = 25 L·atm·mol-1)

A semi-permeable membrane can withstand an osmotic pressure of 0.75 atm. What molarity of aqueous magnesium bromide solution would reach the limit for...

Rank the following aqueous solutions from lowest to highest boiling point: 0.5 m NaCl, 1 m KCl, 0.5 m BaCl2, and 1 m Ba(NO3)2. All salt are dissolved in water.

Rank the following aqueous solutions from lowest to highest boiling point: 0.5 m NaCl, 1 m KCl, 0.5 m BaCl2, and 1 m Ba(NO3)2. All salt are dissolved...

Calculate the vapor pressure at 20°C of a solution containing 0.61g of naphthalene in 16g of chloroform (CHCl3). Naphthalene (C10H8) has a low vapor pressure and may be assumed to be nonvolatile. The vapor pressure of chloroform at 20°C is 156 torr.

Calculate the vapor pressure at 20°C of a solution containing 0.61g of naphthalene in 16g of chloroform (CHCl3). Naphthalene (C10H8) has a low vapor...

What will be the freezing point of a solution of 8 moles of sodium dichromate (Na2Cr2O7) dissolved in 16 kg of water? Use the following values:

What will be the freezing point of a solution of 8 moles of sodium dichromate (Na2Cr2O7) dissolved in 16 kg of water? Use the following values: Kb...

The freezing point of seawater is about -1.85°C. If seawater is an aqueous solution of sodium chloride, calculate the molality of seawater. The kf for water is 1.86 K/m.

The freezing point of seawater is about -1.85°C. If seawater is an aqueous solution of sodium chloride, calculate the molality of seawater. The kf for...

Theoretically, it should be harder to dissolve ( NaCl / Al2S3 ) in water because the (higher / lower) the charge density of a substance, the lower its solubility.

Theoretically, it should be harder to dissolve ( NaCl / Al2S3 ) in water because the (higher / lower) the charge density of a substance, the lower its...

How many moles of ions are contained in 1.27 L of a 1.75 M solution of Mg(NO3)2?

How many moles of ions are contained in 1.27 L of a 1.75 M solution of Mg(NO3)2? a) 0.741 mol b) 6.67 mol c) 4.45 mol d) 2.22 mol Answer: b)...

For solutions of a non-electrolyte, the van't Hoff factor is:

For solutions of a non-electrolyte, the van't Hoff factor is: a) i = 3 b) i = 1 c) i = 2 d) i = 0 Answer: b) i =...

In which of the following pairs do both compounds have a van't Hoff factor (i) of 2?

In which of the following pairs do both compounds have a van't Hoff factor (i) of 2? a) glucose and sodium chloride b) perchloric acid and barium...

Some distilled water is added to an empty beaker. A gram of copper (II) nitrate is added to the beaker and while the water is being stirred. After a few minutes, what is in the beaker?

Some distilled water is added to an empty beaker. A gram of copper (II) nitrate is added to the beaker and while the water is being stirred. After a...

Which of the following would increase the solubility of a gas in water?

Which of the following would increase the solubility of a gas in water? 1. increase the temperature of the water 2. decrease the temperature of the...

Which of the following is a possible combination of values for Hlattice and Hhydration respectively for a salt whose dissolution is endothermic?

Which of the following is a possible combination of values for Hlattice and Hhydration respectively for a salt whose dissolution is endothermic? a)...

Rank the following in terms of decreasing miscibility in C8H18 (octane), a major component of gasoline: C2H5Cl (chloroethane), H2O (water), C2H5F (fluoroethane), and C9H20 (nonane).

Rank the following in terms of decreasing miscibility in C8H18 (octane), a major component of gasoline: C2H5Cl (chloroethane), H2O (water), C2H5F (fluoroethane),...

Both ammonia (NH3) and phosphine (PH3) are soluble in water. Which is least soluble and why?

Both ammonia (NH3) and phosphine (PH3) are soluble in water. Which is least soluble and why? a) ammonia because it does not form hydrogen bonds with...

________ are made when __________ are dissolved in __________.

________ are made when __________ are dissolved in __________. a) solutions, solvents, solutes b) solutions, solutes, solvents c) solvents, solutes,...

An unknown liquid has a vapor pressure of 88 mmHg at 45°C and 39 mmHg at 25°C. What is its heat of vaporization?

An unknown liquid has a vapor pressure of 88 mmHg at 45°C and 39 mmHg at 25°C. What is its heat of vaporization? a) 2000 J/mol b) 32,000 kJ/mol c)...

At 20°C the vapor pressure of dry ice is 56.5 atm. If 10g of dry ice (solid CO2) is placed in an evacuated 0.25 L chamber at a constant 20°C, will all of the solid sublime?

At 20°C the vapor pressure of dry ice is 56.5 atm. If 10g of dry ice (solid CO2) is placed in an evacuated 0.25 L chamber at a constant 20°C, will all...

What is the vapor pressure of carbon disulfide at its normal boiling point?

What is the vapor pressure of carbon disulfide at its normal boiling point? a) Not enough informaiton. b) 2.0 atm c) 1.0 atm d) 22.4 atm Answer: c)...

Consider two empty containers A and B whose volumes are 10mL and 20mL respectively. 1mL of liquid water is put into each container and the temperature of each container is adjusted to 20°C. The gas pressure in container B, which still has some liquid water in it, is found to be 17 torr. How would the pressure in container A and the amount of liquid water in container A compare to that of container B?

Consider two empty containers A and B whose volumes are 10mL and 20mL respectively. 1mL of liquid water is put into each container and the temperature...

In a closed vessel containing water, the pressure is 18 torr. If we add more water to the vessel, this equilibrium pressure would

All of these molecules are non-polar so their strongest IMF is dispersion forces. To rank their IMFs, remember that larger molecules exhibit stronger...

Rank the following liquids by vapor pressure from lowest to highest: C5H12, CH4, C3H8, C2H6, C4H10.

Rank the following liquids by vapor pressure from lowest to highest: C5H12, CH4, C3H8, C2H6, C4H10. a) C5H12 < C4H10 < C3H8 < C2H6 < CH4 b)...

Which would have a higher vapor pressure: ethanol (C2H5OH) or dimethyl ether (CH3OCH3)?

Which would have a higher vapor pressure: ethanol (C2H5OH) or dimethyl ether (CH3OCH3)? a) dimethyl ether b) They would have the same vapor pressure...

Which of the following would change the vapor pressure of a sample of water in a closed container?

Which of the following would change the vapor pressure of a sample of water in a closed container? 1. decreasing the size of the container 2. lower...

A sample of carbon dioxide is stored at 10,000 bar and 250K. This sample is then decompressed to 1 bar at constant temperature. Then, at constant pressure it is heated to 400K. Next, it is compressed at constant temperature to 200 bar. According to the phase diagram, how many phase transitions has the sample of carbon dioxide gone through, and what is its final state?

Use the phase diagram for CO2 in the question above to answer the following: A sample of carbon dioxide is stored at 10,000 bar and 250K. This sample...

How much heat is required to heat 2 grams of ice at -30°C to steam at 100°C. Use the approximate values below for your calculations:

How much heat is required to heat 2 grams of ice at -30°C to steam at 100°C. Use the approximate values below for your calculations: c{ice} = 2 J/g*C dH{fusion}...

The ΔH°vap of methane is 8.519 kJ·mol-1 and its ΔS°vap is 85.58 J·mol-1·K-1. What is the boiling point of methane?

The ΔH°vap of methane is 8.519 kJ·mol-1 and its ΔS°vap is 85.58 J·mol-1·K-1. What is the boiling point of methane? a) 0.09954°C b) 99.54 K c) 372.54...

What is the change in entropy ( Svap ) for the vaporization of ethanol ( Hvap = 38.6 kJ·mol-1 ) at its standard boiling temperature (78.4°C)?

What is the change in entropy ( Svap ) for the vaporization of ethanol ( Hvap = 38.6 kJ·mol-1 ) at its standard boiling temperature (78.4°C)? a) 0.110...

Consider liquid ethane (CH3CH3) and liquid methanol (CH3OH). Which would you expect to have a larger H of vaporization?

Consider liquid ethane (CH3CH3) and liquid methanol (CH3OH). Which would you expect to have a larger H of vaporization? a) It is impossible to tell...

Which of the following statements is ALWAYS true about deposition?

Which of the following statements is ALWAYS true about deposition? a) None of the other answers are correct b) dS > 0 c) dH < 0 d) dG < 0 Answer: c)...

Which of the phase changes below might have a H = 11.6 kJ·mol-1?

Which of the phase changes below might have a H = 11.6 kJ·mol-1? a) condensation b) evaporation c) deposition d) freezing b) evaporation Answer: As...

Ice is heated at a constant pressure until it melts and vaporizes. What signs are associated with the total change in entropy and enthrall ( S and H ) for this sample of water?

Ice is heated at a constant pressure until it melts and vaporizes. What signs are associated with the total change in entropy and enthrall ( S and H...

How much NH3 is needed to react completely with 34g of CH3OH?

Consider the following reaction: 2NH3 + CH3OH --> products How much NH3 is needed to react completely with 34g of CH3OH? a) 36g NH3 b) 128g NH3 c)...

Which of the following is primarily responsible for limiting the number of trophic levels in most ecosystems?

Which of the following is primarily responsible for limiting the number of trophic levels in most ecosystems? a) 45.0 moles of H2 b) 33.8 moles of...

A saturated solution of NaBr has a concentration of 45% NaBr in water. What is its solubility in water?

A saturated solution of NaBr has a concentration of 45% NaBr in water. What is its solubility in water? A) 82 g / 100 g H2O B) 4.5 g / 100 g H2O C) 55...

Which of the following Solubility Product expressions below belongs to the following equilibrium reaction. Fe(OH)3(s) ←→Fe3+(aq) + 3OH-(aq)

Which of the following Solubility Product expressions below belongs to the following equilibrium reaction.Fe(OH)3(s) ←→Fe3+(aq) + 3OH-(aq) A) Ksp...

A reaction is considered to be at equilibrium when the rate of the forward reaction is equal to rate of the reverse reaction.

A reaction is considered to be at equilibrium when the rate of the forward reaction is equal to rate of the reverse reaction. Answer: TR...

CaCO3 is considered insoluble in water. CaCO3(s) ↔ Ca2+(aq) + CO32-(aq) Which of the following is true about its equilibrium constant?

CaCO3 is considered insoluble in water.CaCO3(s) ↔ Ca2+(aq) + CO32-(aq)Which of the following is true about its equilibrium constant? A) Kc = 1 B)...

What is the ionic equation for the dissolution of magnesium phosphate, Mg3(PO4)2?

What is the ionic equation for the dissolution of magnesium phosphate, Mg3(PO4)2? A) Mg3(PO4)2(s) ←→Mg32+(aq) + (PO4)22-(aq) B) Mg3(PO4)2(s) ←→Mg2+(aq)...

Consider the following reaction at equilibrium in a closed system: 2NO(g) + Cl2(g) ←→2NOCl(g) + heat What effect will introducing more Cl2(g) to the reaction vessel have on the equilibrium?

Consider the following reaction at equilibrium in a closed system:2NO(g) + Cl2(g) ←→2NOCl(g) + heatWhat effect will introducing more Cl2(g) to the reaction...

The fact that the process of forming a solution is non-spontaneous means that it absorbs heat.

The fact that the process of forming a solution is non-spontaneous means that it absorbs heat. Answer: Tr...

For which of the reactions below does Kc (calculated using concentrations) equal KP (calculated using pressures)?

For which of the reactions below does Kc (calculated using concentrations) equal KP (calculated using pressures)? A) N2(g) + O2(g) ←→2NO(g) Kp = 0.050 B)...

Calculate the Reaction Quotient (Q) for AgCl when 500 mL of 4 x 10-5M AgNO3(aq) is mixed with 500 mL of 3 x 10-5M NaCl(aq) and determine whether AgCl will precipitate.

Calculate the Reaction Quotient (Q) for AgCl when 500 mL of 4 x 10-5M AgNO3(aq) is mixed with 500 mL of 3 x 10-5M NaCl(aq) and determine whether AgCl...

METB is one of the compounds used as octane enhancers in unleaded gasoline. It is manufactured by the catalytic conversion of acetylene to benzene: 3C2H2(g) → C6H6(g). Which value of Kc would make this reaction most useful commercially?

METB is one of the compounds used as octane enhancers in unleaded gasoline. It is manufactured by the catalytic conversion of acetylene to benzene:...

Write the mathematical expression for the reaction quotient, Qc, for the following reaction:

Write the mathematical expression for the reaction quotient, Qc, for the following reaction: 2NH3(g) ←→N2(g) + 3H2(g) A) Qc = (PN2 * P3H2) / (P3 NH3) B)...

Adding sodium cyanide to a saturated solution of AgCl(s) containing suspended AgCl will result in dissolving more AgCl since CN- forms a soluble complex with silver.

Adding sodium cyanide to a saturated solution of AgCl(s) containing suspended AgCl will result in dissolving more AgCl since CN- forms a soluble complex...

Which of the following actions will decrease the amount of hydrazine gas (N2H4) produced in a closed container in the following reaction? Check all correct answers that apply.

Which of the following actions will decrease the amount of hydrazine gas (N2H4) produced in a closed container in the following reaction? Check all...

A reaction is considered to be at equilibrium when the concentration of products equals the concentration of reactants.

A reaction is considered to be at equilibrium when the concentration of products equals the concentration of reactants. Answer: Fal...

For which of the reactions would a change in pressure not shift the equilibrium concentration?

For which of the reactions would a change in pressure not shift the equilibrium concentration? A) N2(g) + O2(g) ←→2NO(g) Kp = 2 x 10-2 B) P4(g) +...

Lewis acid-base adducts (products) can be charged complexes or uncharged solids.

Lewis acid-base adducts (products) can be charged complexes or uncharged solids. Answer: TRU...

If a reaction is reversible, when can it be said to have reached equilibrium?

If a reaction is reversible, when can it be said to have reached equilibrium? Answer: When a system has reached equilibrium, no further changes...

Assuming that no equilibria other than dissolution is involved, calculate the concentration of iodide ions, [I-(aq)], in the following saturated solution of lead iodide, PbI2(s).

Assuming that no equilibria other than dissolution is involved, calculate the concentration of iodide ions, [I-(aq)], in the following saturated solution...

According to LeChatelier's Principle which of the following will affect the equilibrium of the following reaction in a closed container? Check all correct answers that apply.

According to LeChatelier's Principle which of the following will affect the equilibrium of the following reaction in a closed container? Check all correct...

For which of the reactions below does Kc (calculated using concentrations) equal KP (calculated using pressures)?

For which of the reactions below does Kc (calculated using concentrations) equal KP (calculated using pressures)? A)N2(g) + O2(g) ←→ 2NO(g) Kp = 2...

For which of the reactions would a change in pressure not shift the equilibrium concentration?

For which of the reactions would a change in pressure not shift the equilibrium concentration? A) N2(g) + O2(g)←→2NO(g) Kp = 0.050 B) 2NO(g) + Cl2(g)...

Which of the following gases would be least soluble in water?

Which of the following gases would be least soluble in water? Answer: C...

According to LeChatelier's Principle which of the following will not affect the equilibrium of the following reaction in a closed container? Check all correct answers that apply.

According to LeChatelier's Principle which of the following will not affect the equilibrium of the following reaction in a closed container? Check all...

Which of the following slightly soluble compounds has a solubility greater than that calculated from its solubility product because of hydrolysis of the anion present?

Which of the following slightly soluble compounds has a solubility greater than that calculated from its solubility product because of hydrolysis of...