APCE Kinetics & Chemical Equilibrium

Question 1

What is the rate of reaction?

Accepted Answer

The change in concentration of reactants or products per unit time.

Answer

The change in temperature over time.

Answer

The change in pressure over time.

Answer

The amount of energy released during the reaction.

Question 2

What does Le Chatelier's Principle state?

Accepted Answer

The system will shift to minimize the disturbance.

Answer

The system will always remain in equilibrium.

Answer

The system will remain unaffected by any changes.

Answer

The system will instantly shift to the product side.

Question 3

What factors affect the rate of reaction?

Accepted Answer

Concentration, temperature, surface area, and catalysts.

Answer

Only concentration.

Answer

Only temperature and concentration.

Answer

Only surface area.

Question 4

What is activation energy?

Accepted Answer

The minimum energy required for a reaction to occur.

Answer

The energy required to break bonds.

Answer

The energy required to form products.

Answer

The energy released during the reaction.

Question 5

What does the equilibrium constant (K) tell us about a reaction?

Accepted Answer

The relative concentrations of reactants and products at equilibrium.

Answer

The rate of the forward reaction.

Answer

The time it takes to reach equilibrium.

Answer

The concentration of the limiting reagent.

Question 6

How do catalysts affect the rate of reaction?

Accepted Answer

They lower the activation energy and increase the rate of reaction.

Answer

They increase the activation energy.

Answer

They decrease the concentration of reactants.

Answer

They prevent the reaction from happening.

Question 7

What happens to a reaction at equilibrium if the concentration of reactants is increased?

Accepted Answer

The equilibrium will shift to the right to produce more products.

Answer

The equilibrium will shift to the left.

Answer

The equilibrium will remain unchanged.

Answer

The reaction will stop.

Question 8

What is the relationship between temperature and reaction rate?

Accepted Answer

Increasing temperature increases the reaction rate.

Answer

Temperature has no effect on reaction rate.

Answer

Increasing temperature decreases the reaction rate.

Answer

Temperature only affects endothermic reactions.

Question 9

What is the purpose of a reaction mechanism?

Accepted Answer

To explain the sequence of steps in a reaction.

Answer

To show the overall balanced equation.

Answer

To calculate the energy released.

Answer

To find the rate-determining step.