$$\text{Rate} = \frac{\Delta [\text{Product}]}{\Delta t}$$

Question 1

Which term describes the study of reaction rates and the change in concentration of reactants or products over time?

Accepted Answer

Chemical kinetics

Question 2

In the reaction $$A \rightarrow B$$, what does the arrow represent?

Accepted Answer

The conversion of reactants to products

Question 3

Based on the particle diagrams shown for 0, 30, 60, and 90 seconds, what is happening to the concentration of reactant A over time?

Accepted Answer

It decreases

Question 4

Which factor will increase the rate of a chemical reaction by increasing the number of collisions between molecules?

Accepted Answer

Increasing concentration

Question 5

Why does increasing the surface area of a reactant increase the reaction rate?

Accepted Answer

It increases the frequency of collisions

Question 6

Which of the following will increase both the energy and frequency of collisions in a reaction?

Accepted Answer

Increasing temperature

Question 7

A catalyst increases the rate of a reaction by:

Accepted Answer

Decreasing the energy of activation

Question 8

Which equation best represents the rate of a reaction?

Accepted Answer

$$	ext{Rate} = \frac{\Delta [	ext{Product}]}{\Delta t}$$

Question 9

In a medical scenario, why might a powdered drug react faster in the body than a tablet?

Accepted Answer

Powdered drugs have a greater surface area

Question 10

If a reaction is slow because molecules move like a turtle, which change would make them move like a rabbit?

Accepted Answer

Increase the temperature

Question 11

Which of the following best describes the effect of a catalyst on the energy profile of a reaction?

Accepted Answer

It lowers the activation energy peak

Question 12

A reaction between $$	ext{CH}_3	ext{CH}_2	ext{CH}_2	ext{CH}_3$$ and $$	ext{H}_2$$ occurs faster when the hydrocarbon is cut into smaller pieces. Why?

Accepted Answer

Smaller pieces have greater surface area

Question 13

Which of the following is NOT a way to increase the rate of a chemical reaction?

Accepted Answer

Decrease surface area

Question 14

If the energy of activation for a reaction is decreased, what will happen to the reaction rate?

Accepted Answer

It will increase

Question 15

Which statement best explains why increasing the concentration of reactants increases the reaction rate?

Accepted Answer

There are more molecules available to collide

Question 16

A reaction is monitored over time and the number of reactant particles decreases while product particles increase. What does this indicate?

Accepted Answer

The reaction is proceeding forward

Question 17

Which of the following would NOT increase the frequency of collisions in a reaction?

Accepted Answer

Decreasing surface area

Question 18

In a hospital, why is oxygen administered to patients with respiratory distress to speed up cellular reactions?

Accepted Answer

Oxygen increases the concentration of reactants

Question 19

Which of the following is the best definition of activation energy?

Accepted Answer

The energy required to start a reaction

Question 20

A reaction is observed to proceed much faster when a catalyst is present. What is the most likely explanation?

Accepted Answer

The catalyst decreases the activation energy

Chemical Kinetics and Factors Affecting Reaction Rates

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