Question 1

Which of the following best describes the rate of a chemical reaction?

Accepted Answer

The change in concentration of reactant or product divided by the change in time: $$	ext{rate} = \frac{	ext{change in concentration}}{	ext{change in time}}$$

Question 2

A silver spoon tarnishes over several months, while a banana ripens in a few days. What does this difference illustrate?

Accepted Answer

The rate of a reaction depends on the type of chemical process and conditions.

Question 3

Which factor will NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing the concentration of a reactant.

Question 4

For the reaction $$2CO(g) + O_2$(g) \rightarrow 2CO_2(g)$$, what is the effect of removing $$O_2$$?

Accepted Answer

The rate of reaction decreases.

Question 5

Which of the following statements about catalysts is TRUE?

Accepted Answer

A catalyst speeds up both the forward and reverse reactions without changing the equilibrium composition.

Question 6

A reaction is at equilibrium. What happens if more reactant is added?

Accepted Answer

The equilibrium shifts toward the products.

Question 7

Which of the following best describes chemical equilibrium?

Accepted Answer

The rate of the forward reaction equals the rate of the reverse reaction.

Question 8

According to Le Chatelier's Principle, what will happen if the concentration of a product is decreased in a system at equilibrium?

Accepted Answer

The equilibrium will shift toward the products.

Question 9

For the reaction $$H_2(g$$) + $$I_2(g$$) \rightleftharpoons 2HI(g)$$ at equilibrium, what happens if HI$ is removed from the system?

Accepted Answer

The equilibrium shifts to produce more $$HI.$$

Question 10

Which of the following is a correct application of Le Chatelier's Principle in the context of oxygen transport in the blood?

Accepted Answer

A decrease in $$O_2$$ concentration in tissues shifts the equilibrium to release $$O_2$$ from oxyhemoglobin.

Question 11

Which of the following changes will DECREASE the rate of a reaction?

Accepted Answer

Placing the reaction flask in ice.

Question 12

A reaction mixture is at equilibrium. What effect does adding a catalyst have?

Accepted Answer

It decreases the time required to reach equilibrium.

Question 13

Which of the following is TRUE about reversible reactions?

Accepted Answer

They reach a point where the concentrations of reactants and products do not change.

Question 14

In the reaction $$H_2(g$$) + $$I_2(g$$) \rightleftharpoons 2HI(g)$$, what happens to the equilibrium if I_2$ is removed?

Accepted Answer

The equilibrium shifts toward the reactants.

Question 15

Which of the following best explains why increasing the temperature generally increases the rate of a chemical reaction?

Accepted Answer

It increases the number of effective collisions between reactant molecules.

Question 16

A patient at high altitude has increased hemoglobin concentration. According to Le Chatelier's Principle, why does this occur?

Accepted Answer

To shift the equilibrium toward more oxyhemoglobin formation due to lower $$O_2$$ availability.

Question 17

Which of the following is the correct expression for the rate of a reaction?

Accepted Answer

$$	ext{rate} = \frac{	ext{change in concentration}}{	ext{change in time}}$$

Question 18

Which of the following scenarios is an example of Le Chatelier's Principle in action?

Accepted Answer

Adding more $$CO_2 to a $$sealed bottle of soda causes more $$CO_2 to $$dissolve.

Question 19

If a reaction at equilibrium is subjected to a decrease in temperature, what is the likely effect on the rate of reaction?

Accepted Answer

The rate decreases.

Question 20

Which of the following is NOT a factor that affects the rate of a chemical reaction?

Accepted Answer

Color of the reactants.

Chapter 10: Reaction Rates and Chemical Equilibrium – Study Notes

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