Question 1

In an exothermic reaction, heat can be considered a

Accepted Answer

A)  reactant.
B)  product.
C)  rate.
D)  catalyst.
E)  determinant.

Question 2

For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. The reaction is endothermic. What do you expect to happen to the concentration of NO if the temperature is doubled? 
2NOBr(g)  ⇌ 2NO(g)  + Br2(g)

Accepted Answer

A)  The concentration of NO will increase.
B)  The concentration of NO will decrease.
C)  There will be no change in [NO].
D)  A catalyst will be needed to make a change in concentration.
E)  The change in concentration of [NO] will depend on the size of the vessel.

Question 3

An equilibrium in which all the components are gases is a ________ equilibrium.

Accepted Answer

A)  heterogeneous
B)  liquid
C)  catalytic
D)  homogeneous
E)  reversible

Question 4

In a catalytic converter in an automobile, the reaction of carbon monoxide with oxygen produces

Accepted Answer

A)  carbon dioxide.
B)  carbon and more oxygen.
C)  water.
D)  methane.
E)  nitrogen oxide.

Question 5

In a catalyzed chemical reaction, one function of a catalyst is to

Accepted Answer

A)  increase the number of successful reactant collisions.
B)  decrease the concentration of reactants.
C)  change the equilibrium concentrations of the products and reactants.
D)  increase the energy given off during the reaction.
E)  increase the temperature at which the reaction is carried out.

Question 6

The physiological equilibrium system that keeps the temperature of the body constant is called

Accepted Answer

A)  stimulation.
B)  regulation.
C)  metabolism.
D)  homeostasis.
E)  catalysis.

Question 7

Refrigerating perishable foods affects biochemical reactions by

Accepted Answer

A)  increasing concentrations of antioxidants.
B)  removing bacteria.
C)  decreasing the rate of reactions affecting spoilage.
D)  catalyzing the removal of harmful chemicals from the foods.
E)  improving the appearance of the foods.

Question 8

A chemical reaction has reached equilibrium when

Accepted Answer

A)  the concentrations of reactants and products are equal.
B)  all reactants have been converted to products.
C)  all products have been removed from the reaction mixture.
D)  the catalyst has been used up.
E)  the rate of the forward reaction equals the rate of the reverse reaction.

Question 9

The reaction of hemoglobin with oxygen can be written as follows. Hb + O2 ⇌ HbO₂ If the amount of oxygen available to the blood decreases significantly, what happens to the individual involved?

Accepted Answer

A)  Hypoxia results.
B)  Anemia results.
C)  Nitrogen narcosis results.
D)  Oxygen poisoning results.
E)  Acclimatization results.

Question 10

A reaction that can proceed in either the forward or the reverse direction as written is called a ________ reaction.

Accepted Answer

A)  reversible
B)  miniscule
C)  microscopic
D)  solid phase
E)  favored

Question 11

At equilibrium, the concentrations of the reactants and products are always equal.

Accepted Answer

A) True 
 B)False

Question 12

The ________ is the energy difference between reactants and products in a chemical reaction.

Accepted Answer

A)  transition energy
B)  activation energy
C)  product energy
D)  overall energy
E)  heat of reaction

Question 13

A catalyst for a chemical reaction affects the magnitude of the equilibrium constant.

Accepted Answer

A) True 
 B)False

Question 14

In the reaction of carbon dioxide with water to give carbonic acid, the only gaseous component is the carbon dioxide. What will happen to the equilibrium concentration of carbonic acid if the pressure of carbon dioxide is increased in the container?

Accepted Answer

A)  The concentration of carbonic acid will increase.
B)  The carbonic acid concentration will decrease.
C)  The carbonic acid concentration will stay the same.
D)  There will be twice as much carbonic acid as carbon dioxide.
E)  There will be more water available for the reaction.

Question 15

In the following gas phase reaction, what is the effect on the direction of the reaction if more SO₃ is added to the reaction mixture? 
2SO2(g)  + O2(g)  ⇌ 2SO₃(g)

Accepted Answer

A)  The equilibrium shifts to produce more products.
B)  The position of the equilibrium remains unchanged.
C)  The rate of formation of products is increased.
D)  The equilibrium shifts to produce more reactants.
E)  The catalyst for the reaction is used up.

Question 16

The equation for the formation of ammonia from nitrogen and hydrogen is shown below. What is the form of the equilibrium constant? 
3H2(g)  + N2(g)  ⇌ 2NH₃(g)

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 17

For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. If the concentration of both products is 0.10 M at equilibrium, what is the concentration of the starting material, NOBr? 
2NOBr(g)  ⇌ 2NO(g)  + Br2(g)

Accepted Answer

A)  5 × 10-4 M
B)  2.2 × 10-4 M
C)  5 × 10-2 M
D)  2.2 × 10-2 M
E)  2.2 M

Question 18

If the equilibrium constant for a reaction is 1 × 10-5, this means that the equilibrium mixture contains mostly reactants.

Accepted Answer

A) True 
 B)False

Question 19

Carbon monoxide binds to hemoglobin 140 times more strongly than oxygen does. What does this tell you about the equilibrium constants for the two reactions of hemoglobin with carbon monoxide and oxygen?

Accepted Answer

A)  The equilibrium constant for the binding of CO is greater.
B)  The equilibrium constant for the binding of oxygen is greater.
C)  The concentration of carbon monoxide at equilibrium is twice that of oxygen.
D)  Oxygen and carbon monoxide have the same formula mass.
E)  Oxygen and carbon monoxide react with hemoglobin in different fashions.

Question 20

In the reaction of nitrogen and hydrogen to give ammonia, all the reactants and products are

Accepted Answer

A)  gases.
B)  liquids.
C)  solids.
D)  boiling.
E)  frozen.

Exam 10: Reaction Rates and Chemical Equilibrium

If the equilibrium constant for a reaction is 1 × 10-5, this means that the equilibrium mixture contains mostly reactants.

Correct AnswerverifiedShow Answer

Carbon monoxide binds to hemoglobin 140 times more strongly than oxygen does. What does this tell you about the equilibrium constants for the two reactions of hemoglobin with carbon monoxide and oxygen?

Correct AnswerverifiedShow Answer

In a catalyzed chemical reaction, one function of a catalyst is to

Correct AnswerverifiedShow Answer

A reaction that can proceed in either the forward or the reverse direction as written is called a ________ reaction.

Correct AnswerverifiedShow Answer

For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. The reaction is endothermic. What do you expect to happen to the concentration of NO if the temperature is doubled? 2NOBr(g) ⇌ 2NO(g) + Br2(g)

Correct AnswerverifiedShow Answer

A catalyst for a chemical reaction affects the magnitude of the equilibrium constant.

Correct AnswerverifiedShow Answer

At equilibrium, the concentrations of the reactants and products are always equal.

Correct AnswerverifiedShow Answer

The ________ is the energy difference between reactants and products in a chemical reaction.

Correct AnswerverifiedShow Answer

In a catalytic converter in an automobile, the reaction of carbon monoxide with oxygen produces

Correct AnswerverifiedShow Answer

In the reaction of nitrogen and hydrogen to give ammonia, all the reactants and products are

Correct AnswerverifiedShow Answer

Refrigerating perishable foods affects biochemical reactions by

Correct AnswerverifiedShow Answer

An equilibrium in which all the components are gases is a ________ equilibrium.

Correct AnswerverifiedShow Answer

In the following gas phase reaction, what is the effect on the direction of the reaction if more SO₃ is added to the reaction mixture? 2SO2(g) + O2(g) ⇌ 2SO₃(g)

Correct AnswerverifiedShow Answer

In the reaction of carbon dioxide with water to give carbonic acid, the only gaseous component is the carbon dioxide. What will happen to the equilibrium concentration of carbonic acid if the pressure of carbon dioxide is increased in the container?

Correct AnswerverifiedShow Answer

The physiological equilibrium system that keeps the temperature of the body constant is called

Correct AnswerverifiedShow Answer

For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. If the concentration of both products is 0.10 M at equilibrium, what is the concentration of the starting material, NOBr? 2NOBr(g) ⇌ 2NO(g) + Br2(g)

Correct AnswerverifiedShow Answer

The equation for the formation of ammonia from nitrogen and hydrogen is shown below. What is the form of the equilibrium constant? 3H2(g) + N2(g) ⇌ 2NH₃(g)

Correct AnswerverifiedShow Answer

The reaction of hemoglobin with oxygen can be written as follows. Hb + O2 ⇌ HbO₂ If the amount of oxygen available to the blood decreases significantly, what happens to the individual involved?

Correct AnswerverifiedShow Answer

A chemical reaction has reached equilibrium when

Correct AnswerverifiedShow Answer

In an exothermic reaction, heat can be considered a

Correct AnswerverifiedShow Answer

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