Review kinetics and chemical equilibrium collision theory



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REVIEW – KINETICS AND CHEMICAL EQUILIBRIUM – COLLISION THEORY


  1. What does the field of chemical kinetics study?

2) A spark causes propane gas to explode. According to the collision theory, the spark:

A. lowered the activation energy

B. increased the activation energy

C. provided the activation energy

D. acted as a catalyst

 

3) Consider the following reaction:



2H2O2(aq) → O2 + 2H2O(l)

A small amount of KI is added and the reaction rate increases. The best explanation is that KI:

A. is a catalyst

B. causes more collisions

C. causes harder collisions

D. increases the temperature

 

4) The reaction temperature is increased. There are:

A. more collisions and greater collision energy

B. more collisions but the same collision energy

C. the same number of collisions and greater collision energy

D. the same number of collisions but the same collision energy

 

5) A reactant concentration is increased. There are:



A. more collisions and greater collision energy

B. more collisions but the same collision energy

C. the same number of collisions and greater collision energy

D. the same number of collisions but the same collision energy

 

6) A reactant surface area is increased. There are:



A. more collisions and greater collision energy

B. more collisions but the same collision energy

C. the same number of collisions and greater collision energy

D. the same number of collisions but the same collision energy

 

7) In a chemical reaction, which of the following is not true?



 

A. most collisions are successful

B. successful collisions have favourable geometry

C. successful collisions have sufficient energy

D. a collision is required
8) What happens to the activation energy as the temperature in a reacting system decreases?

A. the activation energy increases

B. the activation energy decreases

C. the activation energy stays the same

D. the activation energy is converted to kinetic energy

 

9) How does the addition of a catalyst increase the reaction rate of an endothermic reaction?



A. It reduces the ΔH of the reaction.

B. It increases the ΔH of the reaction.

C. It reduces the required activation energy.

D. It causes the reaction to become exothermic.

10) To increase the rate of a reaction, there must be

 

A. Decrease in the frequency of collisions

B. An Increase in the frequency of collisions.

C. A decrease in the frequency of successful collisions

D. An increase in the frequency of successful collisions

11) The minimum amount of energy needed to start a reaction is called the

A. Activation energy

B. Energy of a reaction

C. Entropy of a reaction.

D. Reaction mechanism energy

Collision theory states that

A. All collisions lead to chemical reactions

B. Most collisions lead to chemical reactions

C. Very few reactions involve particle collisions

D. Effective collisions lead to chemical reactions

 

12) A catalyst increases the rate of a reaction by



A. Increasing the concentration of the reactant(s)

B. Decreasing the concentration of the reactant(s)

C. Increasing the activation energy of the overall reaction

D. Decreasing the activation energy of the overall reaction

 

13) Milk is refrigerated in order to slow the rate of decomposition by bacterial action. The decrease in reaction rate is due to

A. A decrease in surface area

B. A decrease in ∆H for the reaction

C. A decrease in the fraction of particles possessing sufficient energy



D. The introduction of an alternate pathway with greater activation energy

 

14) In general, a chemical reaction requiring a large activation energy will proceed



A. At a fast rate

B. At a slow rate

C. Only at a low temperature

D. Only at low concentrations

 

15) Consider the following reaction:



Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

As the temperature of the above system is increased, the number of collisions

 

A. Increases but fewer are effective



B. Decreases and fewer are effective

C. Increases and more are effective



D. Decreases but more are effective

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