Chemistry MC: December 2017

Archive for December 2017

For the following orbitals, state the values of n, l and ml which apply, and draw a sketch showing the shape and orientation of the orbital.

For the following orbitals, state the values of n, l and ml which apply, and draw a sketch showing the shape and orientation of the orbital. a. 3s b....

Light is a type of matter.

Light is a type of matter. Answer: Fal...

The early scientists who developed the quantum-mechanical model were bewildered by the model and it altered our fundamental view of matter.

The early scientists who developed the quantum-mechanical model were bewildered by the model and it altered our fundamental view of matter. Answer:...

When the elements are arranged in order of increasing number of protons, certain sets of properties recur periodically.

When the elements are arranged in order of increasing number of protons, certain sets of properties recur periodically. Answer: Tr...

In the quantum mechanical treatment of the hydrogen atom, the energy depends on the principal quantum number n but not on the values of l or ml.

In the quantum mechanical treatment of the hydrogen atom, the energy depends on the principal quantum number n but not on the values of l or ml. Answer:...

In the quantum mechanical treatment of the hydrogen atom, the probability of finding an electron at any point is proportional to the wave function .

In the quantum mechanical treatment of the hydrogen atom, the probability of finding an electron at any point is proportional to the wave function . Answer:...

Other factors being constant, a heavy object will have a longer de Broglie wavelength than a light object.

Other factors being constant, a heavy object will have a longer de Broglie wavelength than a light object. Answer: False ...

In the Bohr model of the hydrogen atom, the electron moves in a circular path which Bohr referred to as an orbital.

In the Bohr model of the hydrogen atom, the electron moves in a circular path which Bohr referred to as an orbital. Answer: Fal...

The Rydberg equation, giving the wavelengths of lines in the spectrum of the hydrogen atom, was obtained by assuming that energy is quantized.

The Rydberg equation, giving the wavelengths of lines in the spectrum of the hydrogen atom, was obtained by assuming that energy is quantized. Answer:...

The Rydberg equation is an example of an empirical equation.

The Rydberg equation is an example of an empirical equation. Answer: Tr...

In the Rydberg equation, for a fixed value of n1, the longest wavelength line has n2 = infinity

In the Rydberg equation, for a fixed value of n1, the longest wavelength line has n2 = infinity Answer: Fal...

In a titration, when the number of moles of hydrogen ions equals the number of moles of hydroxide ions, what is said to have happened?

In a titration, when the number of moles of hydrogen ions equals the number of moles of hydroxide ions, what is said to have happened? a. The equivalence...

Acetic acid ionizes in water as follows: CH3COOH + H2O CH3COO-><- + H3O+ Fewer than 1% of ethanoic acid molecules are ionized at any instant. The acetate ion (CH3COO-) is therefore ____.

Acetic acid ionizes in water as follows:CH3COOH + H2O CH3COO-><- + H3O+Fewer than 1% of ethanoic acid molecules are ionized at any instant. The...

What characterizes a strong acid or base?

What characterizes a strong acid or base? a. polar covalent bonding b. complete ionization in water c. ionic bonding d. presence of a hydroxide or...

Which of these solutions is the most basic?

Which of these solutions is the most basic? a. [H+] = 1 × 10^-2M b. [OH-] = 1 × 10^-4M c. [H+] = 1 × 10^-11M d. [OH-] = 1 × 10-13M Answer:...

Which type of solution is one with a pH of 8?

Which type of solution is one with a pH of 8? a. acidic b. basic c. neutral d. The type varies, depending on the solution. Answer: ...

In a neutral solution, the [H+] is ____.

In a neutral solution, the [H+] is ____. a. 10^-14M b. zero c. 1 × 10^7M d. equal to [OH-] Answer: ...

Which of the following represents a Brønsted-Lowry conjugate acid-base pair?

Which of the following represents a Brønsted-Lowry conjugate acid-base pair? a. SO32 - and SO2 b. CO3 2 - and CO c. H3O and H2 d. NH4+ and NH3 Answer:...

What are the acids in the following equilibrium reaction? CN-+ H2O HCN + OH-

What are the acids in the following equilibrium reaction?CN-+ H2O HCN + OH- a. CN-, H2O b. H2O, HCN c. CN-, OH- d. H2O, OH- Answer: ...

In the reaction CO3^2- + H2O -><- HCO3^- + OH^-, the carbonate ion is acting as a(n) ____.

In the reaction CO3^2- + H2O -><- HCO3^- + OH^-, the carbonate ion is acting as a(n) ____. a. Arrhenius base b. Arrhenius acid c. Brønsted-Lowry...

What type of acid is sulfuric acid?

What type of acid is sulfuric acid? a. monoprotic b. diprotic c. triprotic d. none of the above Answer: ...

What is transferred between a conjugate acid-base pair?

What is transferred between a conjugate acid-base pair? a. an electron b. a proton c. a hydroxide ion d. a hydronium ion Answer: ...

The formula of the hydrogen ion is often written as ____.

The formula of the hydrogen ion is often written as ____. a. H2O+ b. OH+ c. H+ d. H4N+ Answer: ...

Which of the following is a property of an acid?

Which of the following is a property of an acid? a. sour taste b. nonelectrolyte c. strong color d. unreactive Answer: ...

When an acid reacts with a base, what compounds are formed?

When an acid reacts with a base, what compounds are formed? a. a salt only b. water only c. metal oxides only d. a salt and water Answer:...

In general, compounds formed from group 1 metals and hydroxide ions are

In general, compounds formed from group 1 metals and hydroxide ions are a. strong acids. b. strong bases. c. weak acids. d. weak bases. Answer:...

Which of the following dissociates entirely into metal ions and hydroxide ions in solution?

Which of the following dissociates entirely into metal ions and hydroxide ions in solution? a. a strong acid b. a strong base c. a weak acid d. a...

In solution, a weak acid produces

In solution, a weak acid produces a. a mixture of molecules and ions. b. all ions. c. all molecules. d. anions, but no hydronium ions. Answer:...

Sulfuric acid is a strong acid. What is true about its conjugate base?

Sulfuric acid is a strong acid. What is true about its conjugate base? a. Its conjugate base is amphoteric. b. Its conjugate base is strong. c. Its...

A chemical equation for the ionization of an acid uses a single arrow to the right (?) to separate the reactant and product sides of the equation. Which of the following is true?

A chemical equation for the ionization of an acid uses a single arrow to the right (?) to separate the reactant and product sides of the equation. Which...

Acid A and acid B are of equal concentration and are tested with a conductivity apparatus. When the electrodes are placed in acid A, the bulb glows dimly. When they are placed in acid B, the bulb glows more brightly. Which of the following is true?

Acid A and acid B are of equal concentration and are tested with a conductivity apparatus. When the electrodes are placed in acid A, the bulb glows...

How can you express the rate of chemical reaction? Give an example.

How can you express the rate of chemical reaction? Give an example. Answer: the rate can be expressed as the amount of reactant changing per unit...

Which expression correctly describes activation energy in a chemical equation?

Which expression correctly describes activation energy in a chemical equation? a. heat released during reaction b. energy barrier between reactants...

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? a. when only reactants are present b. when only products are present c....

What does a chemical reaction rate measure?

What does a chemical reaction rate measure? a. the amount of reactant used b. the energy change per unit of time c. change in amount of reactant per...

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

The amount of heat released by the complete burning of 1 mole of a substance is its a. a specific heat b. heat of combustion c. heat capacity d....

What three factors do you need to know in order to calculate the heat change of a chemical reaction in a calorimeter?

What three factors do you need to know in order to calculate the heat change of a chemical reaction in a calorimeter? a. heat capacity of reactants,...

Calculate the energy required to produce 7 mold of Cl2O7 on the basis of the following balance equation.

Calculate the energy required to produce 7 mold of Cl2O7 on the basis of the following balance equation. 2Cl2 (g) + 7O2 (g) + 130 kcal -> 2Cl2O7...

What is the specific heat of a substance if 1560 cal are required to raise the temperature of a 312-g sample by 15 C?

What is the specific heat of a substance if 1560 cal are required to raise the temperature of a 312-g sample by 15 C? a. 0.033 cal/gc b. 0.33 cal/gc c....

What is the amount of heat required to raise the temperature of 200 g of aluminum by 10 C?

What is the amount of heat required to raise the temperature of 200 g of aluminum by 10 C? (specific heat of aluminum = 0.21 cal/(g)(C)) a. 420 cal b....

What happens when energy is changes from one form to another?

What happens when energy is changes from one form to another? a. some of the energy is lost entirely b. all of the energy can be accounted for c....

How can energy change during a chemical reaction?

How can energy change during a chemical reaction? a. transfer of heat and/or work b. increase in heat and/or destruction of matter c. change in the...

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

How is thermal energy transferred between two injects that are different temperatures? a. the object at a lower temperature pulls heat energy from...

What is the equilibrium constant for the following reaction?

What is the equilibrium constant for the following reaction? C + O2 -><- CO2 a. (C)^2 (O2)^2 / (CO2)^2 b. (CO2) / (C)(O2) Answer:...

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

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

Is sulfur dioxide and oxygen can be made into sulfur trioxide, what is the reverse reaction?

Is sulfur dioxide and oxygen can be made into sulfur trioxide, what is the reverse reaction? a. SO2 + 2SO3 -> 3S +4O2 b. 2SO2 + O2 -> 2SO3 c....

Which statement is true for an equilibrium with a K(eq) of 1 x 10^8?

Which statement is true for an equilibrium with a K(eq) of 1 x 10^8? a. the products are favored b. the reactants are favored c. the reaction is spontaneous d....

The energy that is available to do work in a reaction is called ____.

The energy that is available to do work in a reaction is called ____. a. heat b. enthalpy c. entropy d. free energy Answer: ...

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? a. irreversible b. spontaneous c. reversible, favoring...

In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect in increasing the pressure?

In a reaction (at equilibrium) that makes more moles of gas than it consumes, what is the effect in increasing the pressure? a. The reaction makes...

In an endothermic reaction at equilibrium, what is the effect of raising the temperature?

In an endothermic reaction at equilibrium, what is the effect of raising the temperature? a. The reaction makes more products. b. The reaction...

What happens to a reaction at equilibrium when more reactant is added to the system?

What happens to a reaction at equilibrium when more reactant is added to the system? a. The reaction makes more products. b. the reaction makes more...

Consider the reaction N (g) 3H (g) 2NH (g). What is the effect of decreasing the volume on the contained gases?

Consider the reaction N (g) 3H (g) 2NH (g). What is the effect of decreasing the volume on the contained gases? a. The reaction shifts toward the...

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? a. no reactant; all product b....

Which of the following substances act as catalysts in the body?

Which of the following substances act as catalysts in the body? a. carbohydrates b. nucleic acids c. lipids nucleic acids d. enzymes Answer:...

The rate of a chemical reaction normally ____.

The rate of a chemical reaction normally ____. a. decreases as temperature increases b. is slowed down by a catalyst c. increases as reactant concentration...

A catalyst works by ____.

A catalyst works by ____. a. lowering the activation energy barrier b. shifting the equilibrium position toward the products c. changing the temperature...

What happens to a catalyst in a reaction?

What happens to a catalyst in a reaction? a. it is unchanged b. It is incorporated into the products. c. It is incorporated into the reactants. d....

Why does a catalyst cause a reaction to proceed faster?

Why does a catalyst cause a reaction to proceed faster? a. There are more collisions per second only. b. The collisions occur with greater energy...

Why does a higher temperature cause a reaction to go faster?

Why does a higher temperature cause a reaction to go faster? a. There are more collisions per second only. b. Collisions occur with greater energy...

Activation energy is ____.

Activation energy is ____. a. the heat released in a reaction b. an energy barrier between reactants and products c. the energy given off when reactants...

At what stage of a reaction do atoms have the highest energy?

At what stage of a reaction do atoms have the highest energy? a. reactant stage b. product stage c. transition state stage d. The stage of...

Which law can be used to calculate the number of moles of a contained gas?

Which law can be used to calculate the number of moles of a contained gas? a. Boyle's law b. combined gas law c. ideal gas law d. Charles's law Answer:...

How is the ideal gas law usually written?

How is the ideal gas law usually written? a. = R b. = nR c. PV = nRT d. P = Answer: ...

What does the ideal gas law allow a scientist to calculate that the other gas laws do not?

What does the ideal gas law allow a scientist to calculate that the other gas laws do not? a. number of moles b. pressure c. volume d. temperature Answer:...

The combined gas law relates which of the following?

The combined gas law relates which of the following? a. pressure and volume only b. temperature and pressure only c. volume and temperature only d. temperature,...

In general, for a gas at a constant volume, ____.

In general, for a gas at a constant volume, ____. a. the pressure of the gas is inversely proportional to its temperature in kelvins b. the volume...

As the temperature of a fixed volume of a gas increases, the pressure will ____.

As the temperature of a fixed volume of a gas increases, the pressure will ____. a. vary inversely b. decrease c. not change d. increase Answer:...

When the volume and number of particles of a gas are constant, which of the following is also constant?

When the volume and number of particles of a gas are constant, which of the following is also constant? a. the sum of the pressure and temperature...

If a balloon is heated, what happens to the pressure of the air inside the balloon if the volume remains constant?

If a balloon is heated, what happens to the pressure of the air inside the balloon if the volume remains constant? a. It increases. b. It stays the...

If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant?

If a balloon is heated, what happens to the volume of the air in the balloon if the pressure is constant? a. It increases. b. It stays the same. c. It...

Charles's law states that ____.

Charles's law states that ____. a. the pressure of a gas is inversely proportional to its temperature in kelvins b. the volume of a gas is directly...

When the temperature and number of particles of a gas are constant, which of the following is also constant?

When the temperature and number of particles of a gas are constant, which of the following is also constant? a. the sum of the pressure and volume b. the...

Boyle's law states that ____.

Boyle's law states that ____. a. the volume of a gas varies inversely with pressure b. the volume of a gas varies directly with pressure c. the temperature...

The volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant. How does the gas pressure change?

The volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant. How does the gas pressure change? a. It increases by a factor...

The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change?

The volume of a gas is doubled while the temperature is held constant. How does the gas pressure change? a. It is reduced by one half. b. It does...

When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____.

When the Kelvin temperature of an enclosed gas doubles, the particles of the gas ____. a. move faster b. strike the walls of the container with less...

Why does air escape from a tire when the tire valve is opened?

Why does air escape from a tire when the tire valve is opened? a. The pressure outside the tire is lower than the pressure inside the tire. b. The...

If 4 moles of gas are added to a container that already holds 1 mole of gas, how will the pressure change inside the container?

If 4 moles of gas are added to a container that already holds 1 mole of gas, how will the pressure change inside the container? a. The pressure will...

As the temperature of the gas in a balloon decreases, which of the following occurs?

As the temperature of the gas in a balloon decreases, which of the following occurs? a. The volume of the balloon increases. b. The average kinetic...

What happens to the temperature of a gas when it is compressed?

What happens to the temperature of a gas when it is compressed? a. The temperature increases. b. The temperature does not change. c. The temperature...

If a balloon is squeezed, what happens to the pressure of the gas inside the balloon?

If a balloon is squeezed, what happens to the pressure of the gas inside the balloon? a. It increases. b. It stays the same. c. It decreases. d. The...

If the volume of a container of gas is reduced, what will happen to the pressure inside the container?

If the volume of a container of gas is reduced, what will happen to the pressure inside the container? a. The pressure will increase. b. The pressure...

How does the gas propellant move when an aerosol can is used?

How does the gas propellant move when an aerosol can is used? a. from a region of high pressure to a region of lower pressure b. from a region of high...

Why does the pressure inside a container of gas increase if more gas is added to the container?

Why does the pressure inside a container of gas increase if more gas is added to the container? a. There is an increase in the number of collisions...

Why is a gas easier to compress than a liquid or a solid?

Why is a gas easier to compress than a liquid or a solid? a. Its volume increases more under pressure than an equal volume of liquid does. b. Its...

How are conditions of pressure and temperature, at which two phases coexist in equilibrium, shown on a phase diagram?

How are conditions of pressure and temperature, at which two phases coexist in equilibrium, shown on a phase diagram? a. by a line separating the...

Which of the following is an example of a phase?

Which of the following is an example of a phase? a. pressure b. water vapor c. temperature d. triple point Answer: ...

The direct change of a substance from a solid to a gas is called ____.

The direct change of a substance from a solid to a gas is called ____. a. evaporation b. sublimation c. condensation d. solidification Answer:...

Which of the following elements has the ability to undergo sublimation?

Which of the following elements has the ability to undergo sublimation? a. oxygen b. carbon c. sodium d. iodine Answer: ...

The escape of molecules from the surface of a liquid is known as ____.

The escape of molecules from the surface of a liquid is known as ____. a. condensation c. evaporation b. boiling d. sublimation Answer: ...

The normal boiling point of chloroform, which has a higher vapor pressure than water at 100C, is ____.

The normal boiling point of chloroform, which has a higher vapor pressure than water at 100C, is ____. a. higher than the normal boiling point of...

When the external pressure is 505 kPa, what is the vapor pressure of water at its boiling point?

When the external pressure is 505 kPa, what is the vapor pressure of water at its boiling point? a. 0 kPa b. 101.3 kPa c. 505 kPa d. 1010 kPa Answer:...

Water could be made to boil at 105C instead of 100C by ____.

Water could be made to boil at 105C instead of 100C by ____. a. adding a lot of energy to the water b. increasing the external pressure c. decreasing...

What is the pressure when a liquid is boiling at its normal boiling point?

What is the pressure when a liquid is boiling at its normal boiling point? a. 0 kPa b. 101.3 kPa c. 202 kPa d. 505 kPa Answer: ...

When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid ____.

When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid ____. a. has no observable changes. b. boils vigorously. c....

If energy is added to a boiling liquid, what happens to the temperature of the liquid?

If energy is added to a boiling liquid, what happens to the temperature of the liquid? a. It increases. b. It decreases. c. It does not change. d....

An increase in the temperature of a contained liquid ____.

An increase in the temperature of a contained liquid ____. a. has no effect on the kinetic energy of the liquid b. causes the vapor pressure above...

If a liquid is sealed in a container and kept at constant temperature, how does its vapor pressure change over time?

If a liquid is sealed in a container and kept at constant temperature, how does its vapor pressure change over time? a. It continues to steadily increase. b....

In a dynamic equilibrium between the liquid state and the gas state, what is true about the rate of evaporation?

In a dynamic equilibrium between the liquid state and the gas state, what is true about the rate of evaporation? a. It is greater than the rate of...

Which of the following will evaporate the fastest?

Which of the following will evaporate the fastest? a. water at 0C b. water at 20C c. water at 40C d. All samples will evaporate at the same rate. Answer:...

Why does a liquid's rate of evaporation increase when the liquid is heated?

Why does a liquid's rate of evaporation increase when the liquid is heated? a. More molecules have enough energy to overcome the attractive forces...

What happens to the rate of evaporation of a liquid as the liquid is cooled?

What happens to the rate of evaporation of a liquid as the liquid is cooled? a. It increases. b. It decreases. c. It does not change. d. The change...

Which are the first particles to evaporate from a liquid?

Which are the first particles to evaporate from a liquid? a. particles with the lowest kinetic energy b. particles with the highest kinetic energy c....

What happens to the temperature of a liquid as it evaporates?

What happens to the temperature of a liquid as it evaporates? a. It increases. b. It decreases. c. It does not change. d. The change cannot be determined. Answer:...

Which states of matter can flow?

Which states of matter can flow? a. gases only b. liquids only c. gases and liquids only d. gases, liquids, and solids Answer: ...

What is the key difference between a liquid and a gas?

What is the key difference between a liquid and a gas? a. intermolecular attractions b. the ability to flow c. average kinetic energy d. the motion...

The average kinetic energy of water molecules is greatest in ____.

The average kinetic energy of water molecules is greatest in ____. a. steam at 100C b. liquid water at 90C c. liquid water at 373K d. ice at 0C Answer:...

Consider an iron cube and an aluminum cube. If the two cubes were at the same temperature, how would the average kinetic energy of the particles in iron compare with the average kinetic energy of the particles in aluminum?

Consider an iron cube and an aluminum cube. If the two cubes were at the same temperature, how would the average kinetic energy of the particles in...

When a gas is heated, ____.

When a gas is heated, ____. a. all of the absorbed energy is converted to kinetic energy b. some of the absorbed energy is converted to potential...

The average kinetic energy of the particles of a substance ____.

The average kinetic energy of the particles of a substance ____. a. is not affected by the temperature of the substance b. increases as the temperature...

What happens to the range of energies of the particles in matter when the temperature is increased?

What happens to the range of energies of the particles in matter when the temperature is increased? a. The range of energies becomes narrower. b....

With which temperature scale is temperature directly proportional to average kinetic energy?

With which temperature scale is temperature directly proportional to average kinetic energy? a. Celsius c. Kelvin b. Fahrenheit d. centigrade Answer:...

What happens to the average kinetic energy of the particles in a sample of matter as the temperature of the sample is increased?

What happens to the average kinetic energy of the particles in a sample of matter as the temperature of the sample is increased? a. The average kinetic...

The temperature at which the motion of particles theoretically ceases is ____.

The temperature at which the motion of particles theoretically ceases is ____. a. -273 K b. 0 K c. 0C d. 273C Answer: ...

The pressure of a gas in a container is 152 mm Hg. This is equivalent to ____.

The pressure of a gas in a container is 152 mm Hg. This is equivalent to ____. a. 0.2 atm b. 2 atm c. 0.3 atm d. 0.4 atm Answer: ...

What causes gas pressure in a container such as a helium balloon?

What causes gas pressure in a container such as a helium balloon? a. the walls of the container b. the vacuum maintained in the container c. the simultaneous...

How does the atmospheric pressure at altitudes below sea level compare with atmospheric pressure at sea level?

How does the atmospheric pressure at altitudes below sea level compare with atmospheric pressure at sea level? a. The atmospheric pressure below sea...

Standard conditions when working with gases are defined as ____.

Standard conditions when working with gases are defined as ____. a. 0 K and 101.3 kPa b. 0 K and 1 kPa c. 0C and 101.3 kPa d. 0C and 1 kPa Answer:...

What is one standard atmosphere of pressure in kilopascals?

What is one standard atmosphere of pressure in kilopascals? a. 0 kPa b. 760 kPa c. 101.3 kPa d. 1 kPa Answer: ...

What is the SI unit of pressure?

What is the SI unit of pressure? a. candela b. mole c. pascal d. newton Answer: ...

What instrument is normally used to measure atmospheric pressure?

What instrument is normally used to measure atmospheric pressure? a. thermometer b. barometer c. vacuum d. manometer Answer: ...

Which of the following statements is NOT true about the movement of particles in a gas?

Which of the following statements is NOT true about the movement of particles in a gas? a. Particles travel in straight-line paths until they collide...

Particles in a gas are best described as ____.

Particles in a gas are best described as ____. a. slow-moving, kinetic, hard spheres b. spheres that are in fixed positions when trapped in a container c....

Which of the following statements is NOT true, according to the kinetic theory?

Which of the following statements is NOT true, according to the kinetic theory? a. There is no attraction between particles of a gas. b. Only particles...

The average speed of oxygen molecules in air is about ____.

The average speed of oxygen molecules in air is about ____. a. 0 km/h b. 170 km/h c. 1700 km/h d. 17,000 km/h Answer: ...

Which of the following statements is part of the kinetic theory?

Which of the following statements is part of the kinetic theory? a. The particles of a gas move independently of each other. b. The particles in a...

According to the kinetic theory, collisions between molecules in a gas ____.

According to the kinetic theory, collisions between molecules in a gas ____. a. are perfectly elastic b. are inelastic c. never occur d. cause a loss...

In a particular reaction between copper metal and silver nitrate, 12.7 g Cu produced 38.1 g Ag. What is the percent yield of silver in this reaction?

In a particular reaction between copper metal and silver nitrate, 12.7 g Cu produced 38.1 g Ag. What is the percent yield of silver in this reaction? Cu...

Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%, how many grams of zinc are needed to produce 112 L of H2 at STP?

Hydrogen gas is produced when zinc reacts with hydrochloric acid. If the actual yield of this reaction is 85%, how many grams of zinc are needed to...

Lead nitrate can be decomposed by heating. What is the percent yield of the decomposition reaction if 9.9 g Pb(NO3 )2 are heated to give 5.5 g of PbO?

Lead nitrate can be decomposed by heating. What is the percent yield of the decomposition reaction if 9.9 g Pb(NO3 )2 are heated to give 5.5 g of PbO? 2Pb(NO3...

Which of the following is NOT a reason why actual yield is less than theoretical yield?

Which of the following is NOT a reason why actual yield is less than theoretical yield? a. impure reactants present b. competing side reactions c....

Which of the following is NOT true about "yield"?

Which of the following is NOT true about "yield"? a. The value of the actual yield must be given in order for the percent yield to be calculated. b....

When an equation is used to calculate the amount of product that will form during a reaction, then the value obtained is called the ____.

When an equation is used to calculate the amount of product that will form during a reaction, then the value obtained is called the ____. a. actual...

Which of the following would be the limiting reagent in the reaction shown below? 2H2 (g) + O2 (g) -> 2H2 O(g)

Which of the following would be the limiting reagent in the reaction shown below?2H2 (g) + O2 (g) -> 2H2 O(g) a. 50 molecules of H2 b. 50 molecules...

Which statement is true if 12 mol CO and 12 mol Fe O are allowed to react?

Which statement is true if 12 mol CO and 12 mol Fe O are allowed to react? 3CO(g) + Fe2 O3 (s) 2Fe(s) + 3CO2 (g) a. The limiting reagent is CO and...

Metallic copper is formed when aluminum reacts with copper(II) sulfate. How many grams of metallic copper can be obtained when 54.0 g of Al react with 319 g of CuSO4 ?

Metallic copper is formed when aluminum reacts with copper(II) sulfate. How many grams of metallic copper can be obtained when 54.0 g of Al react with...

Methane and hydrogen sulfide form when hydrogen reacts with carbon disulfide. Identify the excess reagent and calculate how much remains after 36 L of H2 reacts with 12 L of CS2 .

Methane and hydrogen sulfide form when hydrogen reacts with carbon disulfide. Identify the excess reagent and calculate how much remains after 36 L...

What is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3 ? P4 (g) + 6H2 (g) -> 4PH3 (g)

What is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3 ?P4 (g) + 6H2 (g) ->...

Identify the limiting reagent and the volume of CO formed when 11 L CS reacts with 18 L O to produce CO2 gas and SO2 gas at STP. CS2 (g) + 3O2 (g) -> CO2 (g) + 2SO2 (g)

Identify the limiting reagent and the volume of CO formed when 11 L CS reacts with 18 L O to produce CO2 gas and SO2 gas at STP.CS2 (g) + 3O2 (g) ->...

How many liters of chlorine gas can be produced when 0.98 L of HCl react with excess O2 at STP? 4HCl(g) + O2 (g) -> 2Cl2 (g) + 2H2 O(g)

How many liters of chlorine gas can be produced when 0.98 L of HCl react with excess O2 at STP?4HCl(g) + O2 (g) -> 2Cl2 (g) + 2H2 O(g) a. 0.98 L b....

How many liters of NH , at STP, will react with 5.3 g O2 to form NO2 and water? 4NH3 (g) + 7O2 (g) -> 4NO2 + 6H2 O(g)

How many liters of NH , at STP, will react with 5.3 g O2 to form NO2 and water?4NH3 (g) + 7O2 (g) -> 4NO2 + 6H2 O(g) a. 0.004 23 L b. 2.12 L c....

How many grams of beryllium are needed to produce 36.0 g of hydrogen? (Assume an excess of water.)

How many grams of beryllium are needed to produce 36.0 g of hydrogen? (Assume an excess of water.) Be(s) + 2H2 O(l) -> Be(OH)2 (aq) + H2 (g) a....

How many grams of chromium are needed to react with an excess of CuSO4 to produce 27.0 g Cu?

How many grams of chromium are needed to react with an excess of CuSO4 to produce 27.0 g Cu? 2Cr(s) + 3CuSO4 (aq) -> Cr2 (SO4 )3 (aq) + 3Cu(s) a....

Which of the following is NOT true about limiting and excess reagents?

Which of the following is NOT true about limiting and excess reagents? a. The amount of product obtained is determined by the limiting reagent. b....

When two substances react to form products, the reactant which is used up is called the ____.

When two substances react to form products, the reactant which is used up is called the ____. a. determining reagent b. limiting reagent c. excess...

Calcium oxide, or lime, is produced by the thermal decomposition of limestone in the reaction CaCO (s) ---> CaO(s) + CO2 (g). What mass of lime can be produced from 1.5 x 10 ^3 kg of limestone?

Calcium oxide, or lime, is produced by the thermal decomposition of limestone in the reaction CaCO (s) ---> CaO(s) + CO2 (g). What mass of lime can...

Glucose, C6 H12 O6 , is a good source of food energy. When it reacts with oxygen, carbon dioxide and water are formed. How many liters of CO are produced when 126 g of glucose completely react with oxygen?

Glucose, C6 H12 O6 , is a good source of food energy. When it reacts with oxygen, carbon dioxide and water are formed. How many liters of CO are produced...

When 0.1 mol of calcium reacts with 880 g of water, 2.24 L of hydrogen gas form (at STP). How would the amount of hydrogen produced change if the volume of water was decreased to 440 mL (440 g)?

When 0.1 mol of calcium reacts with 880 g of water, 2.24 L of hydrogen gas form (at STP). How would the amount of hydrogen produced change if the volume...

How many liters of NH are needed to react completely with 30.0 L of NO (at STP)?

How many liters of NH are needed to react completely with 30.0 L of NO (at STP)? 4NH3 (g) + 6NO(g) ? 5N2 (g) + 6H2 O(g) a. 5.0 L b. 20.0 L c. 7.5...

Which of the following statements is true about the following reaction?

Which of the following statements is true about the following reaction? 3NaHCO3 (aq) + C6 H8 O7 (aq) ? 3CO2 (g) + 3H2 O(s) +Na3 C6 H5 O7 (aq) a....

Which conversion factor do you use first to calculate the number of grams of CO produced by the reaction of 50.6 g of CH with O ? The equation for the complete combustion of methane is:

Which conversion factor do you use first to calculate the number of grams of CO produced by the reaction of 50.6 g of CH with O ? The equation for the...

How many liters of hydrogen gas are needed to react with CS to produce 2.50 L of CH at STP?

How many liters of hydrogen gas are needed to react with CS to produce 2.50 L of CH at STP? 4H2 (g) + CS2 (l) ? CH4 (g) +2h2 S (g) a. 2.50 L b. 5.00...

How many grams of H PO are produced when 10.0 moles of water react with an excess of P O ?

How many grams of H PO are produced when 10.0 moles of water react with an excess of P O ? P4 O10 (s) + 6H2 ? 4H3 PO4 (aq) a. 1.22 g b. 6.7 g c. 147...

How many moles of H PO are produced when 71.0 g P O reacts completely to form H PO ?

How many moles of H PO are produced when 71.0 g P O reacts completely to form H PO ? P4 O10 (s) + 6H2 ? 4H3 PO4 (aq) a. 0.063 5 mol b. 1.00 mol c....

Mercury can be obtained by reacting mercury(II) sulfide with calcium oxide. How many grams of calcium oxide are needed to produce 36.0 g of Hg?

Mercury can be obtained by reacting mercury(II) sulfide with calcium oxide. How many grams of calcium oxide are needed to produce 36.0 g of Hg? 4HgS(s)...

Aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. How many grams of aluminum sulfate would be formed if 250 g H SO completely reacted with aluminum?

Aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. How many grams of aluminum sulfate would be formed if 250 g H SO completely...

When glucose is consumed, it reacts with oxygen in the body to produce carbon dioxide, water, and energy. How many grams of carbon dioxide would be produced if 45 g of C6 H 12 O6 completely reacted with oxygen?

When glucose is consumed, it reacts with oxygen in the body to produce carbon dioxide, water, and energy. How many grams of carbon dioxide would be...

Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe O are formed when 16.7 g of Fe reacts completely with oxygen?

Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe O are formed when 16.7 g of Fe reacts completely with oxygen? 4Fe(s)...

The equation below shows the decomposition of lead nitrate. How many grams of oxygen are produced when 11.5 g NO is formed?

The equation below shows the decomposition of lead nitrate. How many grams of oxygen are produced when 11.5 g NO is formed? 2Pb(NO3 )2 (s) ? 2PBO(s)...

Which type of stoichiometric calculation does not require the use of the molar mass?

Which type of stoichiometric calculation does not require the use of the molar mass? a. mass-mass problems b. mass-volume problems c. mass-particle...

At STP, how many liters of oxygen are required to react completely with 3.6 liters of hydrogen to form water? 2H2 (g) + O2 (g) ? 2H2 O(g)

At STP, how many liters of oxygen are required to react completely with 3.6 liters of hydrogen to form water?2H2 (g) + O2 (g) ? 2H2 O(g) a. 1.8 L b....

When iron rusts in air, iron(III) oxide is produced. How many moles of oxygen react with 2.4 mol of iron in the rusting reaction? 4Fe(s) + 3O2 (g) ? 2Fe2O3 (s)

When iron rusts in air, iron(III) oxide is produced. How many moles of oxygen react with 2.4 mol of iron in the rusting reaction?4Fe(s) + 3O2 (g) ?...

Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid are needed to completely react with 15.0 mol of aluminum? 2Al(s) + 3H2 SO4 (aq) ? Al2 (SO4 )3 (aq) + 3H2 (g)

Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid are needed to completely react with 15.0 mol of...

How many moles of glucose, C H O , can be "burned" biologically when 10.0 mol of oxygen is available? C6 H12 O6 (s) + 6O2 (g) ? 6CO2 (g) + 6H2 O(l)

How many moles of glucose, C H O , can be "burned" biologically when 10.0 mol of oxygen is available?C6 H12 O6 (s) + 6O2 (g) ? 6CO2 (g) + 6H2 O(l) a....

Calculate the number of moles of Al O that are produced when 0.60 mol of Fe is produced in the following reaction. 2Al(s) + 3FeO(s) 3Fe(s) + Al2 O3 (s)

Calculate the number of moles of Al O that are produced when 0.60 mol of Fe is produced in the following reaction.2Al(s) + 3FeO(s) 3Fe(s) + Al2 O3 (s) a....

How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 2Al(s) + 3FeO(s) ? 3Fe(s) + Al2 O3 (s)

How many moles of aluminum are needed to react completely with 1.2 mol of FeO?2Al(s) + 3FeO(s) ? 3Fe(s) + Al2 O3 (s) a. 1.2 mol b. 0.8 mol c. 1.6...

At STP, how many liters of oxygen are required to react completely with 3.6 liters of hydrogen to form water? 2H2 (g) + O2 (g) ? 2H2 O(g)

At STP, how many liters of oxygen are required to react completely with 3.6 liters of hydrogen to form water?2H2 (g) + O2 (g) ? 2H2 O(g) a. 1.8...

Calculate the number of moles of Al O that are produced when 0.60 mol of Fe is produced in the following reaction. 2Al(s) + 3FeO(s) 3Fe(s) + Al2 O3 (s)

Calculate the number of moles of Al O that are produced when 0.60 mol of Fe is produced in the following reaction.2Al(s) + 3FeO(s) 3Fe(s) + Al2 O3 (s) a....

How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 2Al(s) + 3FeO(s) ? 3Fe(s) + Al2 O3 (s)

How many moles of aluminum are needed to react completely with 1.2 mol of FeO?2Al(s) + 3FeO(s) ? 3Fe(s) + Al2 O3 (s) a. 1.2 mol b. 0.8 mol c. 1.6...

Which of the following is an INCORRECT interpretation of the balanced equation shown below? 2S(s) + 3O2 (g) ? 2SO3 (g)

Which of the following is an INCORRECT interpretation of the balanced equation shown below?2S(s) + 3O2 (g) ? 2SO3 (g) a. 2 atoms S + 3 molecules...

Which of the following is true about the total number of reactants and the total number of products in the reaction shown below? C5 H12 (l) + 8O2 (g) ? 5CO2 (g) + 6H2 O(g)

Which of the following is true about the total number of reactants and the total number of products in the reaction shown below?C5 H12 (l) + 8O2 (g)...

In the reaction 2CO(g) + O2 (g) ? 2CO2 (g), what is the ratio of moles of oxygen used to moles of CO2 produced?

In the reaction 2CO(g) + O2 (g) ? 2CO2 (g), what is the ratio of moles of oxygen used to moles of CO2 produced? a. 1:1 b. 2:1 c. 1:2 d. 2:2 Answer:...

The first step in most stoichiometry problems is to ____.

The first step in most stoichiometry problems is to ____. a. add the coefficients of the reagents b. convert given quantities to moles c. convert...

In any chemical reaction, the quantities that are preserved are ____.

In any chemical reaction, the quantities that are preserved are ____. a. the number of moles and the volumes b. the number of molecules and the volumes c....

In a chemical reaction, the mass of the products ____.

In a chemical reaction, the mass of the products ____. a. is less than the mass of the reactants b. is greater than the mass of the reactants c. is...

In every chemical reaction, ____.

In every chemical reaction, ____. a. mass and molecules are conserved b. moles and liters are conserved c. mass and atoms are conserved d. moles and...

What is conserved in the reaction shown below? N2 (g) + 3F2 (g) ? 2NF3 (g)

What is conserved in the reaction shown below?N2 (g) + 3F2 (g) ? 2NF3 (g) a. atoms only b. mass only c. mass and atoms only d. moles only Answer:...

What is conserved in the reaction shown below? H2 (g) + Cl2 (g) ? 2HCl(g)

What is conserved in the reaction shown below?H2 (g) + Cl2 (g) ? 2HCl(g) a. mass only b. mass and moles only c. mass, moles, and molecules only d....

If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you need if you want to use up all 3 eggs and 1 cup of oil?

If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you need if you want to use up all 3 eggs and 1...

The calculation of quantities in chemical equations is called ____.

The calculation of quantities in chemical equations is called ____. a. stoichiometry b. dimensional analysis c. percent composition d. percent yield Answer:...

Continuous spectra are characteristic of molecules in the gas phase.

Continuous spectra are characteristic of molecules in the gas phase. Answer: Fal...

Continuous spectra are characteristic of heated solids.

Continuous spectra are characteristic of heated solids. Answer: Tr...

Line spectra are characteristic of atoms in the gas phase.

Line spectra are characteristic of atoms in the gas phase. Answer: Tr...

The energy of a photon is directly proportional to the wavelength of the radiation.

The energy of a photon is directly proportional to the wavelength of the radiation. Answer: Fal...

Which of the atoms represented below is the largest in size?

Which of the atoms represented below is the largest in size? A) N B) As C) Sb D) Bi E) P Answer: ...

How many core electrons are in a ground state atom of arsenic?

How many core electrons are in a ground state atom of arsenic? A) 15 B) 33 C) 28 D) 5 E) none of the above Answer: ...

Which one of the following types of electromagnetic radiation has a higher energy per photon than visible radiation?

Which one of the following types of electromagnetic radiation has a higher energy per photon than visible radiation? A) microwave B) ultraviolet C)...

Which color of visible light has a wavelength in between that of blue and violet light?

Which color of visible light has a wavelength in between that of blue and violet light? A) green B) yellow C) red D) indigo E) none of the above Answer:...

Which of the following atoms has the greatest metallic character?

Which of the following atoms has the greatest metallic character? A) Cs B) Be C) Cu D) Ti E) Au Answer:...

Which of the following atoms has the least metallic character?

Which of the following atoms has the least metallic character? A) Li B) Na C) K D) Rb E) Cs Answer: ...

Which of the following atoms is the smallest?

Which of the following atoms is the smallest? A) Li B) Be C) B D) O E) Ne Answer: ...

Which of the following atoms is the largest?

Which of the following atoms is the largest? A) Li B) Na C) K D) Rb E) Cs Answer:...

Which of the following elements has the highest ionization energy?

Which of the following elements has the highest ionization energy? A) Ba B) Ca C) Al D) Cl E) Ne Answer:...

Which of the following elements has the lowest ionization energy?

Which of the following elements has the lowest ionization energy? A) Rb B) Na C) C D) F E) He Answer: ...

The size of an atom generally increases:

The size of an atom generally increases: A) down a group and from right to left across a period. B) up a group and from left to right across a period. C)...

Choose the answer that best completes the following statement: When an aluminum atom reacts so as to attain a noble gas electron configuration,

Choose the answer that best completes the following statement: When an aluminum atom reacts so as to attain a noble gas electron configuration, A)...

If the electron configuration of a ground state potassium atom is 1s22s22p63s1, the electron configuration of the potassium cation (K+) would be:

If the electron configuration of a ground state potassium atom is 1s22s22p63s1, the electron configuration of the potassium cation (K+) would be: A)...

Which one of the following species has the electron configuration of 1s22s22p6?

Which one of the following species has the electron configuration of 1s22s22p6? 1. Na+ 2. O^2- 3. F- A) 1 and 2 only B) 1 and 3 only C) 2 and 3...

Consider the electron configuration of the ion to determine which ion shown below has an incorrect ionic charge?

Consider the electron configuration of the ion to determine which ion shown below has an incorrect ionic charge? A) Al^3- B) Se^2- C) Rb+ D) Ba^2+ E)...

Chlorine and bromine have very similar chemical properties. This is best explained by the fact that both elements:

Chlorine and bromine have very similar chemical properties. This is best explained by the fact that both elements: A) are gases. B) are in period...

Which of the following elements has the electron configuration of 3s23p4 in its outermost shell?

Which of the following elements has the electron configuration of 3s23p4 in its outermost shell? A) Al B) Si C) S D) Cl E) none of the above Answer:...

What do the alkali metals all have in common?

What do the alkali metals all have in common? A) They all undergo similar reactions. B) They all have similar physical properties. C) They all form...

How many valence electrons are in a chlorine atom?

How many valence electrons are in a chlorine atom? A) 1 B) 17 C) 10 D) 7 E) none of the above Answer: ...

How many core electrons are in a chlorine atom?

How many core electrons are in a chlorine atom? A) 1 B) 17 C) 10 D) 7 E) none of the above Answer: ...

What is the element in which at least one electron is in the d-orbital?

What is the element in which at least one electron is in the d-orbital? A) Ar B) K C) Ca D) Sc E) none of the above Answer: ...

The element with a completely filled p-subshell is:

The element with a completely filled p-subshell is: A) Na. B) Al. C) P. D) Ar. E) none of the above Answer: ...

What is the electron configuration for P?

What is the electron configuration for P? A) [Ar]3s23p64s23d104p3 B) [Ne]1s21p62s22p3 C) [Ne]3s23p3 D) [Ar]3s23p3 E) none of the above Answer:...

What is the electron configuration for Ga?

What is the electron configuration for Ga? A) 1s22s22p63s23p63d104s24p6 B) 1s22s22p63s23p64s23d104p1 C) 1s22s22p63s23p53d104s24p1 D) 1s22s22p63s23p64s24d104p1 E)...

What is the electron configuration for Kr?

What is the electron configuration for Kr? A) 1s22s22p63s23p43d104s24p6 B) 1s22s22p63s23p64s23d24p6 C) 1s22s22p63s23p64s23d104p6 D) 1s22s22p63s23p24s23d104p6 E)...

Which element is represented by the electron configuration 1s22s22p2?

Which element is represented by the electron configuration 1s22s22p2? A) C B) He C) Be D) O E) none of the above Answer: ...

An accepted abbreviation format is to write an electron configuration that includes a noble gas symbol in brackets. If you were writing an electron configuration for a bromine atom, which elemental symbol would you place in the bracket?

An accepted abbreviation format is to write an electron configuration that includes a noble gas symbol in brackets. If you were writing an electron...