Chemistry MC: November 2020

Archive for November 2020

How does shaking or stirring a mixture of solute and solvent affect a solution?

How does shaking or stirring a mixture of solute and solvent affect a solution?Answer: It increases the rate of dissolv...

What usually makes a substance dissolve faster in a solvent

What usually makes a substance dissolve faster in a solventAnswer: Agitating the solut...

What is a colligative property of a solution?

What is a colligative property of a solution?Answer: Boiling point elevat...

What is the concentration of a solution?

What is the concentration of a solution?Answer: Measure of the amount of solute in a specified quantity of solve...

What does the symbol delta H^0 subscript f represent?

What does the symbol delta H^0 subscript f represent?Answer: Standard heat of formation for a compo...

The amount of heat involved in the synthesis of 1 mole of a compound from its elements, with all substances in their standard states at 25 degrees Celsius is called _______

The amount of heat involved in the synthesis of 1 mole of a compound from its elements, with all substances in their standard states at 25 degrees Celsius...

During a phase change, the temp of a substance _______

During a phase change, the temp of a substance _______Answer: Remains const...

The amount of heat needed to melt one mole of a solid at a constant temp is called ________

The amount of heat needed to melt one mole of a solid at a constant temp is called ________Answer: Molar heat of fus...

The amount of heat released released by the complete burning of 1 mole of a substance is its ______

The amount of heat released released by the complete burning of 1 mole of a substance is its ______Answer: Heat of combust...

The heat content of a system is equal to the enthalpy only for a system that is at constant _____

The heat content of a system is equal to the enthalpy only for a system that is at constant _____Answer: Press...

What is quantity of heat required to change the temp of 1 g of a substance by 1 degree Celsius?

What is quantity of heat required to change the temp of 1 g of a substance by 1 degree Celsius?Answer: Specific h...

What is a process that absorbs heat?

What is a process that absorbs heat?Answer: Endothermic proc...

What is the heat of solution?

What is the heat of solution?Answer: Amount of heat absorbed or released when a solid dissol...

How can you determine the enthalpy for a reaction in an aqueous solution?

How can you determine the enthalpy for a reaction in an aqueous solution?Answer: Mix the reactants in a calorimeter and measure the temp chan...

By what quantity must the heat capacity of an object be divided to obtain the specific heat of that material?

By what quantity must the heat capacity of an object be divided to obtain the specific heat of that material?Answer: Its m...

How can you describe the specific heat of olive oil if it takes approximately 420 J of heat to raise the temp of 7 g of olive oil by 30 degrees Celsius?

How can you describe the specific heat of olive oil if it takes approximately 420 J of heat to raise the temp of 7 g of olive oil by 30 degrees Celsius?Answer: Less...

What statement correctly describes the energy of the chemical bonds of the reactants in an exothermic reaction?

What statement correctly describes the energy of the chemical bonds of the reactants in an exothermic reaction?Answer: Greater than the energy stored...

How do calories and joules differ from one another?

How do calories and joules differ from one another?Answer: They are two different measures of amounts of ener...

During an endothermic chemical reaction, what is the source of energy that causes the reaction to continue?

During an endothermic chemical reaction, what is the source of energy that causes the reaction to continue?Answer: Materials in the surroundings...

What phase change is endothermic process?

What phase change is endothermic process?Answer: Evaporat...

How is thermal energy transferred between two objects that are at different temperatures?

How is thermal energy transferred between two objects that are at different temperatures?Answer: Heat flows from the warmer object to the cooler...

What is the ion-product constant for water?

What is the ion-product constant for water?Answer: 1 x 10^...

What describes an aqueous solution of potassium bromide?

What describes an aqueous solution of potassium bromide?Answer: Neut...

In a titration, what happens when the number of moles of hydrogen ions equals the number of moles of hydroxide ions?

In a titration, what happens when the number of moles of hydrogen ions equals the number of moles of hydroxide ions?Answer: The equivalence point...

What are has the smallest base dissociation constant?

What are has the smallest base dissociation constant?Answer: Ammo...

What describes an aqueous solution of ammonium sulfate?

What describes an aqueous solution of ammonium sulfate?Answer: Weakly a...

What acid has the greatest dissociation constant?

What acid has the greatest dissociation constant?Answer: Nitric a...

The ionization constant of HF is 6.7 x 10^-4. What is true in a 0.1 M solution of this acid?

The ionization constant of HF is 6.7 x 10^-4. What is true in a 0.1 M solution of this acid?Answer: [HF] is greater than [H^+] [F...

What would a substance with a Ka of 1 x 10^-5 would be classified as?

What would a substance with a Ka of 1 x 10^-5 would be classified as?Answer: Weak a...

What combination of acid and salt in aqueous solution would form a buffer?

What combination of acid and salt in aqueous solution would form a buffer?Answer: Carbonic acid and sodium carbon...

What is another name for the acid dissociation constant?

What is another name for the acid dissociation constant?Answer: Ionization const...

What does the word strong refer to in reference to solutions of strong acid and bases?

What does the word strong refer to in reference to solutions of strong acid and bases?Answer: Degree of ionizat...

What is the acid dissociation constant for an acid dissolved in water equal to?

What is the acid dissociation constant for an acid dissolved in water equal to?Answer: Equilibrium constant times the concentration of wa...

What characterizes a strong acid or base?

What characterizes a strong acid or base?Answer: Complete ionization in wa...

What is [H+] in a neutral solution?

What is [H+] in a neutral solution?Answer: Equal to [O...

What are the products of self ionization of water?

What are the products of self ionization of water?Answer: OH^- and H3...

What represents a Brønsted Lowry conjugate acid base pair?

What represents a Brønsted Lowry conjugate acid base pair?Answer: NH4^+ and ...

What are the Brønsted-Lowry acids in the reaction CN^-+H2O➡️HCN+OH^-?

What are the Brønsted-Lowry acids in the reaction CN^-+H2O➡️HCN+OH^-?Answer: H2O and ...

How many moles of calcium hydroxide are needed to neutralize 2 moles of sulfuric acid, H2SO4?

How many moles of calcium hydroxide are needed to neutralize 2 moles of sulfuric acid, H2SO4?Answer:&nbs...

In the reaction CO3^-2+H2O➡️HCO3^-+OH^-, what is the carbonate ion acting as?

In the reaction CO3^-2+H2O➡️HCO3^-+OH^-, what is the carbonate ion acting as?Answer: Brønsted lowry b...

How does an indicator provide information about the pH of a solution?

How does an indicator provide information about the pH of a solution?Answer: By dissociating into ions that have a different color than the molecular...

What can a Lewis acid do?

What can a Lewis acid do?Answer: Accept a pair of electr...

What compound yields the lowest concentration of hydroxide ions in aqueous solution?

What compound yields the lowest concentration of hydroxide ions in aqueous solution?Answer: Magnesium hydrox...

How is the formula of the hydrogen ion often written?

How is the formula of the hydrogen ion often written?Answer: ...

What statement is true about an elementary reaction?

What statement is true about an elementary reaction?Answer: An elementary reaction converts reactants to products in a single st...

When nitrous oxide is converted to nitrogen and oxygen, what is the term used to describe the oxygen atoms formed?

When nitrous oxide is converted to nitrogen and oxygen, what is the term used to describe the oxygen atoms formed?Answer: Intermedia...

What is the overall rate order of A+2B➡️C+D

What is the overall rate order of A+2B➡️C+DAnswer: Th...

What is the rate law for the reaction A+2B➡️C+D

What is the rate law for the reaction A+2B➡️C+DAnswer: Rate= k[A][B...

What is true about the numerical value of Gibbs free-energy change for a spontaneous reaction?

What is true about the numerical value of Gibbs free-energy change for a spontaneous reaction?Answer: It is negat...

What determines whether or not a reaction is spontaneous?

What determines whether or not a reaction is spontaneous?Answer: Enthalpy and entropy cha...

What is true about melting ice at temperatures above 0 degrees Celsius?

What is true about melting ice at temperatures above 0 degrees Celsius?Answer: It's endother...

What is true about spontaneous processes?

What is true about spontaneous processes?Answer: They all release free ene...

What are the two factors that determine whether a reaction is spontaneous or nonSpontaneous?

What are the two factors that determine whether a reaction is spontaneous or nonSpontaneous?Answer: Entropy and ene...

When a student in a chemistry lab combines 2 clear solutions a precipitate forms. What conclusion can the student make about the combined solution?

When a student in a chemistry lab combines 2 clear solutions a precipitate forms. What conclusion can the student make about the combined solution?Answer: The...

What is the amount of disorder in a system measured by?

What is the amount of disorder in a system measured by?Answer: Entr...

The Ksp of nickel sulfide is 4.0 x 10^-20. What is the concentration of sulfide ion in a saturated solution of nickel sulfide to which 0.040 mold of nickel nitrate is added?

The Ksp of nickel sulfide is 4.0 x 10^-20. What is the concentration of sulfide ion in a saturated solution of nickel sulfide to which 0.040 mold of nickel...

What does entropy measure?

What does entropy measure?Answer: Disor...

What is the energy available to do work in a reaction?

What is the energy available to do work in a reaction?Answer: Free ene...

If Keq= 4 x 10^-7, what is true?

If Keq= 4 x 10^-7, what is true?Answer: Reactants are favo...

If a reaction has an equilibrium constant just greater than 1, what type of reaction is it?

If a reaction has an equilibrium constant just greater than 1, what type of reaction is it?Answer: Reversible; favoring produ...

In an equilibrium reaction that makes more moles of gas than it consumes, what is the effect of increasing the pressure?

In an equilibrium reaction that makes more moles of gas than it consumes, what is the effect of increasing the pressure?Answer: The reaction makes...

Consider the reaction N2 (g) + 3H2 (g) ➡️ 2NH3(g). What is the effect of decreasing the volume on the contained gases?

Consider the reaction N2 (g) + 3H2 (g) ➡️ 2NH3(g). What is the effect of decreasing the volume on the contained gases?Answer: The reaction shifts...

If a reaction is reversible, what are the relative amounts of reactant and product at the end of the reaction?

If a reaction is reversible, what are the relative amounts of reactant and product at the end of the reaction?Answer: Some product; some react...

The Ksp of nickel sulfide is 4.0 x 10^-20. What is the concentration of sulfide ion in a saturated solution of nickel sulfide?

The Ksp of nickel sulfide is 4.0 x 10^-20. What is the concentration of sulfide ion in a saturated solution of nickel sulfide?Answer: 2.0 x 10^-10...

What expression show the solubility product constant for silver sulfide, Ag2S, which is very slightly soluble in water?

What expression show the solubility product constant for silver sulfide, Ag2S, which is very slightly soluble in water?Answer: Ksp=2[Ag^+][S^...

By what does a catalyst work by?

By what does a catalyst work by?Answer: Lowering the activation energy barr...

Why does a catalyst cause a reaction to proceed faster?

Why does a catalyst cause a reaction to proceed faster?Answer: A catalyst decreases the activation energy of react...

At what stage of a chemical reaction is chemical energy at its highest level?

At what stage of a chemical reaction is chemical energy at its highest level?Answer: When an activated complex exi...

What's another for the activated complex?

What's another for the activated complex?Answer: Transition st...

How can a redox rxn be used as a source of electrical energy?

How can a redox rxn be used as a source of electrical energy?Answer: 2 half rxns must be physically separa...

In a zinc copper cell, Zn | Zn2+ (1M) || Cu2+ (1M), what material is the negative made?

In a zinc copper cell, Zn | Zn2+ (1M) || Cu2+ (1M), what material is the negative made?Answer: Zn...

First electrochemical cell invented by?

First electrochemical cell invented by?Answer: Vo...

What metal is most easily reduced?

What metal is most easily reduced?Answer: C...

What metal will plate a lead strip that is dipped into a solution of one of its ions?

What metal will plate a lead strip that is dipped into a solution of one of its ions?Answer: Merc...

What metal will be oxidized by calcium ions?

What metal will be oxidized by calcium ions?Answer: Potass...

What metal's ions are most easily reduced?

What metal's ions are most easily reduced?Answer: Merc...

What metal is most easily oxidized?

What metal is most easily oxidized?Answer: Highly active me...

What metal tends to resist losing electrons to corrosion?

What metal tends to resist losing electrons to corrosion?Answer: Plati...

Next to last step in balancing a redox rxn by half reaction method?

Next to last step in balancing a redox rxn by half reaction method?Answer: Make electron changes of both half reactions eq...

First step in balancing redox rxn by half reaction method?

First step in balancing redox rxn by half reaction method?Answer: Write equation showing ions separat...

Next to last step in balancing redox rxn by oxidation number change method?

Next to last step in balancing redox rxn by oxidation number change method?Answer: Choose coefficients to make the change in oxidation number equal...

First step in balancing a redox reaction by oxidation number change method?

First step in balancing a redox reaction by oxidation number change method?Answer: Assign oxidation numbers to all at...

To obtain good separations in chromatography, what factor must be maximized and what factor must be minimized?

To obtain good separations in chromatography, what factor must be maximized and what factor must be minimized?maximize migration differencesminimize ...

Be able to define retention volume (Vr). What does a larger retention volume mean about a component's ability to interact with the liquid chromatography column?

Be able to define retention volume (Vr). What does a larger retention volume mean about a component's ability to interact with the liquid chromatography...

Be able to name the mobile phase and stationary phases in your paper chromatography experiment and be able to use the "like dissolves like" principle to rationalize relative Rf values for dye molecules.

Be able to name the mobile phase and stationary phases in your paper chromatography experiment and be able to use the "like dissolves like" principle...

Be able to calculate Rf values for developed chromatograms

Be able to calculate Rf values for developed chromatogramsAnswer: Distance moved by the component / Distance moved by the mobile phase fr...

Given the mass of the scrubber and the volume of CO2 absorbed, be able to calculate the absorption capacity.

Given the mass of the scrubber and the volume of CO2 absorbed, be able to calculate the absorption capacity.1)convert volume of CO2 to grams2)Plug both...

Given the volume of CO2 absorbed, be able to calculate how many grams of CO2 that corresponds to

Given the volume of CO2 absorbed, be able to calculate how many grams of CO2 that corresponds to1)Rearrange PV=nRT to find the number of moles of CO22)Calculate...

Explain what is meant by a "back titration". Why is this a better approach than a regular titration for the analysis of calcium carbonate in egg shells. Be able to calculate the calcium carbonate content of an egg shell.

Explain what is meant by a "back titration". Why is this a better approach than a regular titration for the analysis of calcium carbonate in egg shells....

In section C you did some titrations of HCl with NaOH, using BTB as an indicator. What is observed at the endpoint, and what is the overall and net ionic equation?

In section C you did some titrations of HCl with NaOH, using BTB as an indicator. What is observed at the endpoint, and what is the overall and net ionic...

Explain a difference between a "serial" titration and a "single well" titration. Cite one advantage of each type (in comparison with the other).

Explain a difference between a "serial" titration and a "single well" titration. Cite one advantage of each type (in comparison with the other).Answer: Serial:...

You used two different types of indicators in this experiment -- red cabbage extract, and bromothymol blue. Be able to cite one advantage of the BTB indicator over red cabbage.

You used two different types of indicators in this experiment -- red cabbage extract, and bromothymol blue. Be able to cite one advantage of the BTB indicator...

Define the 4 major types of reactions that occur in aqueous solution and give an example of each type.

Define the 4 major types of reactions that occur in aqueous solution and give an example of each type.1. Acid/Base: acids react with bases to produce...

One of the solutions you used is labeled "aqueous ammonia/ammonium hydroxide." Why is such a complicated name used?

One of the solutions you used is labeled "aqueous ammonia/ammonium hydroxide." Why is such a complicated name used?Answer: The dissolved ammonia...

Write out chemical equations to explain why: 1. aqueous sodium carbonate is basic, 2. aqueous aluminum chloride is acidic, and 3. aqueous potassium iodide is neutral.

Write out chemical equations to explain why: 1. aqueous sodium carbonate is basic, 2. aqueous aluminum chloride is acidic, and 3. aqueous potassium iodide...

Use the "like dissolves like" principle to explain the solubility experiments that you did with ethanol, pentanol, kerosene, and water.

Use the "like dissolves like" principle to explain the solubility experiments that you did with ethanol, pentanol, kerosene, and water.Answer: A...

Explain the "like dissolves like" principle and know some specific examples that document your explanation.

Explain the "like dissolves like" principle and know some specific examples that document your explanation.Answer: Polar substances are able to dissolve...

You observed a reaction involving crystal Draino which is the same reaction that took place in the first step of the alum synthesis. Write out this reaction equation.

You observed a reaction involving crystal Draino which is the same reaction that took place in the first step of the alum synthesis. Write out this reaction...

You did a melting point test on the alum you made. What two things does this tell you about your compound? Explain.

You did a melting point test on the alum you made. What two things does this tell you about your compound? Explain.Answer: It confirms the identity...

In section B you tested for the presence of SO₄²⁻, K⁺, Al³⁺ and H₂O. Be able to explain how they were tested for and what should have been observed in each test.

In section B you tested for the presence of SO₄²⁻, K⁺, Al³⁺ and H₂O. Be able to explain how they were tested for and what should have been observed in...

Given the overall reaction equation for the synthesis of alum and the molar masses involved, you should be able to calculate theoretical yield. If you are given the wt. of alum actually obtained, you should be able to calculate the % yield.

Given the overall reaction equation for the synthesis of alum and the molar masses involved, you should be able to calculate theoretical yield. If you...

Write an equation which explains why carbonated beverages are acidic.

Write an equation which explains why carbonated beverages are acidic.CO₂ + H₂O → H₂CO₃.H₂CO₃ is carbonic ac...

When H2SO4 is added to one of the scratched up areas of an aluminum can bubbles are observed. Write a reaction equation to explain this observation.

When H2SO4 is added to one of the scratched up areas of an aluminum can bubbles are observed. Write a reaction equation to explain this observation.Answer: 3...

Explain the difference between the corrosion of iron and the corrosion of aluminum.

Explain the difference between the corrosion of iron and the corrosion of aluminum.Answer: Iron corrodes relatively quickly while Al reacts with...

Give two reasons why aluminum is expensive to produce, and two uses for the alum compound that you synthesized.

Give two reasons why aluminum is expensive to produce, and two uses for the alum compound that you synthesized.Answer: Expensive: The bauxite deposits...

Be able to describe the observations of OTO (from Chlorine test kit) with tap water and water passed through a Brita filter. Explain.

Be able to describe the observations of OTO (from Chlorine test kit) with tap water and water passed through a Brita filter. Explain.When tap water was...

Be able to use the dilution equation given in this experiment to solve dilution problems.

Be able to use the dilution equation given in this experiment to solve dilution problems.Answer: C1V1=C...

What process removes the energy from excited food dye molecules in aqueous solution?

What process removes the energy from excited food dye molecules in aqueous solution?Answer: The extra energy is removed continuously by the solvent...

Describe the technique of colorimetry.

Describe the technique of colorimetry.Answer: The process where a set of solutions of known concentrations of some light absorbing substance is placed...

What is the fundamental reason why a substance absorbs visible light?

What is the fundamental reason why a substance absorbs visible light?Answer: The energy of a particular photon of visible light matches the energy...

Explain the complementary nature of absorbed/observed colors.

Explain the complementary nature of absorbed/observed colors.Answer: The observed color is the color transmitted, where the absorbed color is it's...

If you are given the wavelengths of light observed by a particular student for the hydrogen emission spectrum you should be able to (a) determine the frequencies and energies associated with these wavelengths, (b) be able to use the Bohr equation to calculate the wavelengths expected for the Balmer series of the hydrogen atom, (c) be able to quantitatively compare the results from (a) and (b) - i.e., know how to calculate the % difference between a students results and Bohrs.

If you are given the wavelengths of light observed by a particular student for the hydrogen emission spectrum you should be able to (a) determine the...

Outline in a few sentences how you calibrated your spectroscope.

Outline in a few sentences how you calibrated your spectroscope.1. Spectroscope constructed.2. Sample of excited hydrogen gas was viewed through spect.3....

Explain the effect on the spectrum by (a) changing the slit width and (b) the distance from the source of light to the spectroscope.

Explain the effect on the spectrum by (a) changing the slit width and (b) the distance from the source of light to the spectroscope.(a) slit width wider...

Describe what is meant by the term "white light," and know the wavelength range (in nm) that white light covers. List the colors of the spectrum from the highest to the lowest frequency.

Describe what is meant by the term "white light," and know the wavelength range (in nm) that white light covers. List the colors of the spectrum from...

What kind of energy transitions were observed in this experiment?

What kind of energy transitions were observed in this experiment?Answer: Electronic energy transitions. (valence electro...

Explain the difference between line and continuous spectrum, and give an example of a source of each type.

Explain the difference between line and continuous spectrum, and give an example of a source of each type.Continuous: contains all the frequencies of...

When walking, an average person burns 0.453 Food Calories/mile-pounds. How many food calories does a 150-pound person burn after walking a mile? If a peanut releases 5.7 Food Calories/g and an average peanut weighs about 1 gram, then how many peanuts will you have to eat to walk a mile?

When walking, an average person burns 0.453 Food Calories/mile-pounds. How many food calories does a 150-pound person burn after walking a mile? If a...

What is meant by a small calorie "c" and a food calorie "C"?

What is meant by a small calorie "c" and a food calorie "C"?A small calorie "c" is a scientific calorie and it is 1000x smaller than a food calorie. Food...

Know how to calculate amount of energy released using E=mcΔT.

Know how to calculate amount of energy released using E=m*c*ΔT.Answer: E=energy, m=mass, c=specific heat, ΔT=change in temperat...

What is the bond energy of a triple bond

What is the bond energy of a triple bondAnswer: 908 kJ/...

What is the bond energy of a double bond

What is the bond energy of a double bondAnswer: 657 kJ/...

What is the bond energy of a single bond

What is the bond energy of a single bondAnswer: 347 kJ/...

Which bonds are the shortest and strongest

Which bonds are the shortest and strongestAnswer: triple bo...

Which bonds are the longest and weakest

Which bonds are the longest and weakestAnswer: single bo...

What elements frequency form double and triple bonds

What elements frequency form double and triple bondsAnswer: C, O,...

In which set do all elements tend to form anions in binary ionic compounds?

In which set do all elements tend to form anions in binary ionic compounds?A) Li, Na, KB) N, O, IC) C, S, PbD) K, Fe, BrAnswer: B) N, O,...

Write the name for FeS.

Write the name for FeS.A) iron sulfideB) iron (I) sulfideC) iron (I) sulfateD) iron (II) sulfideE) iron (II) sulfateAnswer: D) iron (II) sulf...

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol.

Determine the volume of hexane that contains 5.33 × 1022 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol.A)...

Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19 g/mol.

Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19...

Combustion analysis of 63.8 mg of a C, H and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?

Combustion analysis of 63.8 mg of a C, H and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the...

Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.

Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.A) 2 CH3 (g) + 5 O (g)...

When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers. Which law does this refer to?

When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole...

Give the number of electrons in P-3.

Give the number of electrons in P-3.A) 18B) 12C) 16D) 15E) 19Answer: A)...

Predict the charge that the ion formed from bromine would have.

Predict the charge that the ion formed from bromine would have.A) 2+B) 1-C) 4+D) 1+E) 2-Answer: B)...

Which of the following elements is a nonmetal?

Which of the following elements is a nonmetal?A) CaB) ZnC) CoD) PE) CsAnswer: D)...

Which of the following elements is a noble gas?

Which of the following elements is a noble gas?A) KB) NC) ArD) BrE) OAnswer: C)...

Which of the following elements is an alkaline earth metal?

Which of the following elements is an alkaline earth metal?A) CuB) TiC) BrD) CsE) MgAnswer: E)...

The atomic mass for cadmium is

The atomic mass for cadmium isA) 40.08B) 112.41C) 20D) 48Answer: B) 112...

Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.11%. What is the amu of the other isotope?

Gallium has an atomic mass of 69.723 amu. The Ga-69 (68.926 amu) is 60.11%. What is the amu of the other isotope?A) 70.932 amuB) 70.928 amuC) 70.920 amuD)...

Which of the following contains the MOST atoms? You shouldn't need to do a calculation here.

Which of the following contains the MOST atoms? You shouldn't need to do a calculation here.A) 10.0 g MgB) 10.0 g NeC) 10.0 g KrD) 10.0 g ArE) 10.0 g...

How many Li atoms are contained in 97.9 g of Li?

How many Li atoms are contained in 97.9 g of Li?A) 4.27 × 1022 Li atomsB) 5.90 × 1025 Li atomsC) 7.09 × 1021 Li atomsD) 8.49 × 1024 Li atomsE) 4.18 ×...

Calculate the mass (in g) of 1.9 x 1024 atoms of Pb.

Calculate the mass (in g) of 1.9 x 1024 atoms of Pb.A) 2.4 × 102 gB) 6.5 × 102 gC) 3.9 × 102 gD) 1.5 × 102 gE) 3.2 × 102 gAnswer: B) 6.5 × 102...

A mass of mercury occupies 0.550 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g/mL and the density of ethanol is 0.789 g/mL.

A mass of mercury occupies 0.550 L. What volume would an equal mass of ethanol occupy? The density of mercury is 13.546 g/mL and the density of ethanol...

Choose the element from the list below.

Choose the element from the list below.A) carbon dioxideB) rustC) waterD) sodium chlorideE) heliumAnswer: E) hel...

Choose the homogeneous mixture from the list below.

Choose the homogeneous mixture from the list below.A) colaB) salsaC) mudD) salad dressingE) ice waterAnswer: A) c...

Which of the following are examples of a chemical change?

Which of the following are examples of a chemical change?A) coffee brewingB) water boilingC) salt dissolves in waterD) leaves turning color in the fallE)...

Which of the following represents a physical property?

Which of the following represents a physical property?A) Aluminum has a tendency to "rust."B) Mercury is a silvery liquid at room temperature.C) Butane...

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.71 g/mL, 1.73 g/mL, 1.67 g/mL, 1.69 g/mL. If the actual value for the density of the sugar solution is 1.40 g/mL, which statement below best describes her results?

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.71 g/mL, 1.73 g/mL, 1.67 g/mL, 1.69...

What wavelength of light would you report in units of nm, if the light had a wavelength of 7.60 x 10-10 m?

What wavelength of light would you report in units of nm, if the light had a wavelength of 7.60 x 10-10 m?Answer: 0.760...

One example of a condensation polymer is

One example of a condensation polymer isA) polyethylene.B) nylon.C) Teflon.D) polystyrene.Answer: B) nyl...

How does the monomer of polyvinyl chloride (PVC) differ from the monomer of polyethylene (PE)?

How does the monomer of polyvinyl chloride (PVC) differ from the monomer of polyethylene (PE)?A) The PVC monomer has a chlorine atom, but the PE monomer...

What is Teflon used for?

What is Teflon used for?A) filmB) nonstick cookwareC) bullet-proof vestsD) garbage bagsAnswer: B) nonstick cookw...

The plastic that is used in light weight, rustproof plumbing pipes is

The plastic that is used in light weight, rustproof plumbing pipes isA) Teflon.B) polyethylene.C) PVC.D) Bakelite.Answer: C) P...

The plastic material used to make transparent "throw-away" drinking cups and disposable coffee cups is

The plastic material used to make transparent "throw-away" drinking cups and disposable coffee cups isA) polyvinyl chloride.B) polystyrene.C) polyethylene.D)...

A polymer that conducts electricity is

A polymer that conducts electricity isA) polyacetylene.B) polyethylene.C) polyvinyl chloride.D) polystyrene.Answer: A) polyacetyle...

The monomer used to make PVC is

The monomer used to make PVC isA) H2CCH2.B) Cl2CCH2.C) H2CCHCl.D) F2CCF2.Answer: C) H2CCH...

The monomer used to make Teflon is

The monomer used to make Teflon isA) H2CCH2.B) Cl2CCH2.C) H2CCHCl.D) F2CCF2.Answer: D) F2CC...

Polyvinyl chloride is used for drain pipes in plumbing applications. It has replaced traditional cast iron pipe for this purpose. The major advantage of PVC in replacing cast iron for this application (particularly if you are a plumber or homeowner) is that PVC

Polyvinyl chloride is used for drain pipes in plumbing applications. It has replaced traditional cast iron pipe for this purpose. The major advantage...

The monomer of PVC differs from the monomer of PE by

The monomer of PVC differs from the monomer of PE byA) one atom.B) two atoms.C) three atoms.D) four atoms.Answer: A) one at...

The monomer of polypropylene is

The monomer of polypropylene isA) CH2CH2.B) CH2CHCH3.C) CH3CH3.D) CH3CH2CH3.Answer: B) CH2CHC...

Which of the following statements about the difference between HDPE and LDPE is NOT correct?

Which of the following statements about the difference between HDPE and LDPE is NOT correct?A) HDPE has a higher density than LDPE does.B) HDPE holds...

Which of the following statements about ethylene and polyethylene is true?

Which of the following statements about ethylene and polyethylene is true?A) The polymer has the same properties as the monomer.B) The polymer has alternating...

The polymer segment ~CH2CH2CH2CH2CH2CH2CH2~ represents

The polymer segment ~CH2CH2CH2CH2CH2CH2CH2~ representsA) polyethylene.B) polypropylene.C) polystyrene.D) polyvinyl chloride.Answer: A) polyethyl...

A copolymer is composed of

A copolymer is composed ofA) two or more different monomers.B) different polymers linked end to end.C) different polymers cross-linked.D) none of the...

The most widely used synthetic polymer is

The most widely used synthetic polymer isA) polyethylene.B) polyvinyl chloride.C) polystyrene.D) polytetrafluoroethylene (Teflon).Answer: A) pol...

HDPE stands for

HDPE stands forA) high-density polyethylene.B) hot-dipped polyethylene.C) high-dose polyethylene.D) highly-diffuse polyethylene.Answer: A) high-density...

LDPE stands for

LDPE stands forA) linearly dense polyethylene.B) light diffuse polyethylene.C) low-density polyethylene.D) lightly doped polyethylene.Answer: C)...

LDPE finds applications as

LDPE finds applications asA) food wrap.B) rigid containers.C) drain pipes.D) television cabinets.Answer: A) food wr...

HDPE finds applications in

HDPE finds applications inA) food wrap.B) rigid containers.C) squeeze bottles.D) garbage bags.Answer: B) rigid containe...

Low-density polyethylene is composed of

Low-density polyethylene is composed ofA) primarily linear, unbranched chains of polyethylene in a close packing arrangement.B) primarily highly branched,...

High-density polyethylene is composed of

High-density polyethylene is composed ofA) primarily linear, unbranched chains of polyethylene in a close packing arrangement.B) primarily highly branched,...

Which of the following is the simplest synthetic polymer?

Which of the following is the simplest synthetic polymer?A) polymethaneB) polyethyleneC) polyvinyl chlorideD) polystyreneAnswer: B) polyethyl...

Wool and silk are examples of which type of naturally occurring polymer?

Wool and silk are examples of which type of naturally occurring polymer?A) celluloseB) polyestersC) nucleic acidsD) proteinsAnswer: D) prote...

Which of the following is a naturally occurring polymer?

Which of the following is a naturally occurring polymer?A) compositesB) nylonC) starchD) None of the above is a naturally occurring polymer.Answer: C)...

Natural polymers which carry the coded genetic information that makes each individual unique are

Natural polymers which carry the coded genetic information that makes each individual unique areA) proteins.B) carboxylic acids.C) esters.D) nucleic acids.Answer: D)...

Which of the following roots means "many"?

Which of the following roots means "many"?A) merB) monoC) polyD) tetraAnswer: C) p...

Which statement relating monomers and polymers is correct?

Which statement relating monomers and polymers is correct?A) They have the same chemical and physical properties.B) They have different chemical and physical...

The word monomer means

The word monomer meansA) one bond.B) one unit.C) many bonds.D) many rings.Answer: B) one un...

The word polymer means many

The word polymer means manyA) parts.B) sides.C) rings.D) carbons.Answer: A) par...

Monomers are

Monomers areA) small building blocks of polymers.B) small polymers.C) ethylene.D) all of the aboveAnswer: A) small building blocks of polyme...

Hard water deposits (calcium carbonate) have built up around your bathroom sink. Which one of the following would be best to dissolve the deposit?

Hard water deposits (calcium carbonate) have built up around your bathroom sink. Which one of the following would be best to dissolve the deposit?A) ammoniaB)...

When the pH of the blood is too high, the condition is called ________.

When the pH of the blood is too high, the condition is called ________.A) acidosisB) alkalosisC) hyperacidityD) anemiaAnswer: B) alkalo...

Aluminum hydroxide is a popular antacid. The formula of aluminum hydroxide is

Aluminum hydroxide is a popular antacid. The formula of aluminum hydroxide isA) AlOH.B) Al(OH)2.C) Al(OH)3.D) Al3OH.Answer: C) Al(OH...

All antacids are

All antacids areA) acids.B) bases.C) neutral.D) salts.Answer: B) bas...

Sodium bicarbonate is commonly known as

Sodium bicarbonate is commonly known asA) baking soda.B) baking powder.C) washing soda.D) cherry soda.Answer: A) baking so...

Rain with which of the following pH of values would be considered to be acid rain?

Rain with which of the following pH of values would be considered to be acid rain?A) 9.5B) 9.0C) 7D) 1.5Answer: D) ...

By definition, acid rain has a pH

By definition, acid rain has a pHA) below 4.B) below 5.6.C) below 7.D) above 8.5Answer: B) below 5...

Acid rain is caused by acidic pollutants in the air. Which of the following pollutants does NOT contribute to acid rain?

Acid rain is caused by acidic pollutants in the air. Which of the following pollutants does NOT contribute to acid rain?A) ammonia, NH3B) sulfur dioxide,...

Which of the following does NOT contribute to acid rain?

Which of the following does NOT contribute to acid rain?A) coal-burning power plantsB) lightningC) volcanic eruptionsD) All of the above contribute to...

The pH of rain collected on a remote island in the Pacific is assumed to be unaffected by human pollution. The pH of the rainwater will be

The pH of rain collected on a remote island in the Pacific is assumed to be unaffected by human pollution. The pH of the rainwater will beA) less than...

A buffer

A bufferA) resists changes in pH when small amounts of a strong acid or a strong base are added.B) is made up of a weak acid and its conjugate base.C)...

A mixture of a weak acid and its conjugate base forms a(n)

A mixture of a weak acid and its conjugate base forms a(n)A) acid-base indicator.B) buffer.C) antacid.D) acid rain.Answer: B) buff...

A conjugate acid-base pair differ by one

A conjugate acid-base pair differ by oneA) H atom.B) O atom.C) pH unit.D) proton.Answer: D) prot...

What is the conjugate base of HSO3-?

What is the conjugate base of HSO3-?A) H2SO4B) H2SO3C) HSO4-D) SO32-Answer: D) SO...

What is the conjugate acid of HSO3-?

What is the conjugate acid of HSO3-?A) H2SO4B) H2SO3C) HSO4-D) SO32-Answer: B) H2...

Which of the following form a conjugate acid-base pair?

Which of the following form a conjugate acid-base pair?A) H2SO4 and SO42-B) H3O+ and OH-C) H2SO4 and HSO4-D) CH4 and CH3OHAnswer: C) H2SO4 and H...

Which substance has the lowest pH?

Which substance has the lowest pH?A) bloodB) lemon juiceC) unpolluted rainwaterD) NaOH (4% solution)Answer: B) lemon ju...

An unknown substance is added to a solution and the pH increases. The substance is best described as a(n)

An unknown substance is added to a solution and the pH increases. The substance is best described as a(n)A) acid.B) base.C) salt.D) solvent.Answer: B)...

An unknown substance is added to a solution and the pH decreases. The substance is best described as a(n)

An unknown substance is added to a solution and the pH decreases. The substance is best described as a(n)A) acid.B) base.C) salt.D) solvent.Answer: A)...

A solution of toilet bowl cleaner has a pH of 13. The solution is

A solution of toilet bowl cleaner has a pH of 13. The solution isA) strongly acidic.B) weakly acidic.C) strongly basic.D) weakly basic.Answer: C)...

A solution of toilet bowl cleaner has a pH of 9. The solution is

A solution of toilet bowl cleaner has a pH of 9. The solution isA) weakly basic.B) strongly basic.C) weakly acidic.D) strongly acidic.Answer: A)...

A solution with a pH of 10 has a hydronium ion concentration of

A solution with a pH of 10 has a hydronium ion concentration ofA) 10-10 mol/L.B) 1010 mol/L.C) 10 mol/L.D) -10 mol/L.Answer: A) 10-10 mol...

A sample of rainwater has a pH of 3.5. What ion is sure to be present in relatively large concentration in this rain sample?

A sample of rainwater has a pH of 3.5. What ion is sure to be present in relatively large concentration in this rain sample?A) H3O+B) SO42-C) OH-D) HSO4-Answer: A)...

Phenolphthalein has often been used to monitor the progress of acid-base neutralization reactions. What color will phenolphthalein be if there is an excess of base present?

Phenolphthalein has often been used to monitor the progress of acid-base neutralization reactions. What color will phenolphthalein be if there is an excess...

Phenolphthalein has often been used to monitor the progress of an acid-base neutralization reaction. What color will phenolphthalein be when there is an excess of acid present?

Phenolphthalein has often been used to monitor the progress of an acid-base neutralization reaction. What color will phenolphthalein be when there is...

Which of the following is the correct balanced equation for the neutralization of barium hydroxide with sulfuric acid?

Which of the following is the correct balanced equation for the neutralization of barium hydroxide with sulfuric acid?A) Ba(OH)2 + H2SO4 → BaSO4 + 2 H2OB)...

Which of the following is the correct balanced equation for the neutralization of barium hydroxide with hydrochloric acid?

Which of the following is the correct balanced equation for the neutralization of barium hydroxide with hydrochloric acid?A) Ba(OH)2 + 2 HCl → BaCl2 +...

In the balanced chemical reaction for the neutralization of calcium hydoxide with sulfuric acid, H2SO4, the coefficient of water is

In the balanced chemical reaction for the neutralization of calcium hydoxide with sulfuric acid, H2SO4, the coefficient of water isA) 4.B) 5C) 1.D) 2.Answer: D)...

In the balanced chemical reaction for the neutralization of sodium hydoxide with sulfuric acid, H2SO4, the coefficient of water is

In the balanced chemical reaction for the neutralization of sodium hydoxide with sulfuric acid, H2SO4, the coefficient of water isA) 2.B) 1.C) 3.D) 4.Answer: A)...

In the balanced chemical reaction for the neutralization of calcium hydoxide with nitric acid, HNO3, the coefficient of calcium nitrate is

In the balanced chemical reaction for the neutralization of calcium hydoxide with nitric acid, HNO3, the coefficient of calcium nitrate isA) 3.B) 1.C)...

A weak base

A weak baseA) is present in low concentration in solution.B) is present in high concentration in solution.C) ionizes only slightly in solution.D) ionizes...

Nitrous acid, HNO2, is classified as a weak acid in water. This means that it produces

Nitrous acid, HNO2, is classified as a weak acid in water. This means that it producesA) no hydronium ions.B) a relatively small fraction of the maximum...

An acid is strong if it

An acid is strong if itA) is very concentrated.B) makes acid-base indicators change color.C) ionizes completely in water.D) causes metals to corrode.Answer: C)...

Citric acid is made by oranges. When citric acid dissolves in water, it produces a relatively small number of hydronium ions. Citric acid is best described as a

Citric acid is made by oranges. When citric acid dissolves in water, it produces a relatively small number of hydronium ions. Citric acid is best described...

All of the following are strong acids EXCEPT

All of the following are strong acids EXCEPTA) hydrochloric acid.B) sulfuric acid.C) nitric acid.D) acetic acid.Answer: D) acetic ac...

When an aqueous solution containing hydrochloric acid is just neutralized with an aqueous solution containing sodium hydroxide, the solution would taste

When an aqueous solution containing hydrochloric acid is just neutralized with an aqueous solution containing sodium hydroxide, the solution would tasteA)...

Sodium hydroxide is classified as a strong base in water. This means that it produces

Sodium hydroxide is classified as a strong base in water. This means that it producesA) no hydroxide ions.B) a relatively small fraction of the maximum...

Ammonia is classified as a weak base in water. This means that it produces

Ammonia is classified as a weak base in water. This means that it producesA) no hydroxide ions.B) a relatively small fraction of the maximum number of...

Nitric acid, HNO3, is classified as a strong acid in water. This means that it produces

Nitric acid, HNO3, is classified as a strong acid in water. This means that it producesA) no hydronium ions.B) a relatively small fraction of the maximum...

HCN is classified as a weak acid in water. This means that it produces

HCN is classified as a weak acid in water. This means that it producesA) no hydronium ions.B) a relatively small fraction of the maximum number of possible...

The same number of moles of acetic acid and hydrogen chloride are placed in beakers containing water. After this addition, the beaker with the HCl has more hydronium ions than the beaker with added acetic acid. HCl is classified as

The same number of moles of acetic acid and hydrogen chloride are placed in beakers containing water. After this addition, the beaker with the HCl has...

When metal oxides react with water, the resulting solution is generally ________.

When metal oxides react with water, the resulting solution is generally ________.A) saltyB) acidicC) neutralD) basicAnswer: D) ba...

When nonmetal oxide reacts with water, the resulting solution is ________.

When nonmetal oxide reacts with water, the resulting solution is ________.A) saltyB) acidicC) neutralD) basicAnswer: B) aci...

When added to water, which of the following would produce an acid?

When added to water, which of the following would produce an acid?A) NaB) MgOC) NH3D) SO3Answer: D) ...

Which of the following is an example of a nonmetal oxide?

Which of the following is an example of a nonmetal oxide?A) CO2B) NaOHC) K2OD) H2SO4Answer: A) ...

Lime is used in farming to reduce the acidity of the soil. The chemical name for lime is calcium oxide. When water in the soil reacts with lime, what base is formed?

Lime is used in farming to reduce the acidity of the soil. The chemical name for lime is calcium oxide. When water in the soil reacts with lime, what...

What base is formed by the addition of potassium oxide to water?

What base is formed by the addition of potassium oxide to water?A) KOHB) K2OHC) KHD) KH2Answer: A) ...

When added to water, which of the following would produce a base?

When added to water, which of the following would produce a base?A) Na2OB) CO2C) Cl2D) SO3Answer: A) N...

A salt that can conduct electricity when it is dissolved in water is a(n)

A salt that can conduct electricity when it is dissolved in water is a(n)A) buffer.B) catalyst.C) elecrolyte.D) indicator.Answer: C) elecroly...

What is the formula for calcium hydroxide?

What is the formula for calcium hydroxide?A) CaOHB) Ca2OHC) Ca(OH)2D) CaOH2Answer: C) Ca(O...

Which of the following is a correct definition of a base that is not dependent upon the solvent?

Which of the following is a correct definition of a base that is not dependent upon the solvent?A) Bases produce hydronium ions.B) Bases are proton donors.C)...

Which of the following is a hydroxide ion?

Which of the following is a hydroxide ion?A) OH-B) H+C) H3O+D) H2O-Answer: A) ...

A useful broad view of reactions between acids and bases involves the

A useful broad view of reactions between acids and bases involves theA) transfer of protons.B) transfer of electrons.C) conversion of protons into electrons.D)...

All of the following are bases EXCEPT

All of the following are bases EXCEPTA) KOH.B) HNO3.C) NH3.D) Mg(OH)2.Answer: B) HN...

Phosphoric acid is added to many popular beverages to give them a tart flavor. The formula of phosphoric acid is

Phosphoric acid is added to many popular beverages to give them a tart flavor. The formula of phosphoric acid isA) H3PO4.B) H4PO3.C) H2PO4.D) HPO4.Answer: A)...

Sulfuric acid is the leading chemical produced and used industrially. What is the formula for sulfuric acid?

Sulfuric acid is the leading chemical produced and used industrially. What is the formula for sulfuric acid?A) SO4B) HSO4C) H2(SO)4D) H2SO4Answer: D)...

When HCl is added to pure water, HCl molecules lose protons, while water molecules gain protons. In this reaction, HCl is a(n)

When HCl is added to pure water, HCl molecules lose protons, while water molecules gain protons. In this reaction, HCl is a(n)A) acid.B) base.C) salt.D)...