Question : 11) In the following gas phase reaction, what the effect : 1362953

11) 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 + O2 ? 2SO3

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.

12) In the following gas phase reaction, Kc is much less than 1. At equilibrium, which of the following statements is true?

COCl2 ? CO + Cl2

A) The concentration of reactant is much greater than the concentration of products.

B) The concentration of products is much greater than the concentration of reactants.

C) The concentrations of products and reactants are approximately equal.

D) A catalyst will increase the concentration of products formed.

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

13) In the reaction of nitrogen gas with oxygen gas to produce nitrogen oxide, what is the effect of adding more oxygen gas to the initial reaction mixture? The reaction is shown below.

N2(g) + O2(g) ? 2NO(g)

A) The equilibrium shifts to produce more N2.

B) The equilibrium shifts to produce more NO.

C) The equilibrium is not affected.

D) Extra catalyst is required to reach equilibrium.

E) The temperature of the reaction mixture is raised.

14) The equilibrium constant for the production of carbon dioxide from carbon monoxide and oxygen is Kc = 2 x 1011. This means that the reaction mixture at equilibrium is likely to consist of

A) mostly starting materials.

B) an equal mixture of products and reactants.

C) twice as much starting material as product.

D) twice as much product as starting material.

E) mostly products.

15) Which of the following equilibrium constants indicates the reaction that gives the smallest amount of product?

A) Kc = 5 × 10-10

B) Kc = 5 × 10-1

C) Kc = 5 × 100

D) Kc = 5 × 101

E) Kc = 5 × 1010

16) 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?

A) Hypoxia results.

B) Anemia results.

C) Nitrogen narcosis results.

D) Oxygen poisoning results.

E) Acclimatization results.

17) What is the correct form for the equilibrium constant expression for this reaction?

H2 (g) + F2 (g) ? 2 HF(g)

A)

B)

C)

D)

E)

18) The rate of any chemical reaction can be determined by observing

A) the amount of product formed in a unit of time.

B) the ratio of product concentration to reactant concentration.

C) the percent composition of the final product.

D) the theoretical yield of the reaction.

E) the number of chemical bonds broken and remade.

19) In any chemical reaction, the rate of the reaction can be increased by

A) decreasing the temperature.

B) changing the size of the container.

C) adding water to the reaction.

D) adding product molecules to the reaction mixture.

E) increasing the concentrations of the reactants.

20) Refrigerating perishable foods affects biochemical reactions by

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.