Question 1

Which of the following is NOT a characteristic of an exothermic reaction?

Accepted Answer

An absorption of energy from the surroundings.

Answer

An increase in the thermal energy of the system.

Answer

A release of energy to the surroundings.

Answer

An increase in temperature.

Question 2

Which of the following is NOT a characteristic of an endothermic reaction?

Accepted Answer

An increase in temperature.

Answer

A decrease in the thermal energy of the system.

Answer

A decrease in temperature.

Answer

An absorption of energy from the surroundings.

Question 3

Which of the following is an example of an exothermic change?

Accepted Answer

Burning wood in a campfire.

Answer

Melting ice cubes in a glass of water.

Answer

Reacting baking soda and vinegar to produce carbon dioxide gas.

Answer

Condensing water vapor into a cloud.

Question 4

Which of the following is an example of an endothermic change?

Accepted Answer

Melting ice cubes in a glass of water.

Answer

Burning wood in a campfire.

Answer

Condensing water vapor into a cloud.

Answer

Reacting baking soda and vinegar to produce carbon dioxide gas.

Question 5

Which of the following statements best describes an exothermic process?

Accepted Answer

Energy is released to the surroundings.

Answer

Energy is converted into matter.

Answer

There is no exchange of energy with the surroundings.

Answer

Energy is absorbed from the surroundings.

Question 6

Which of the following statements best describes an endothermic process?

Accepted Answer

Energy is absorbed from the surroundings.

Answer

There is no exchange of energy with the surroundings.

Answer

Energy is converted into matter.

Answer

Energy is released to the surroundings.

Question 7

What is the process of breaking down a compound into its elements using electricity called?

Accepted Answer

Electrolysis

Answer

Ionization

Answer

Decomposition

Answer

Reduction

Question 8

Which of the following factors affects the rate of a chemical reaction?

Accepted Answer

Temperature

Answer

Mass

Answer

Color

Answer

Density

Question 9

How does an increase in temperature affect the rate of a chemical reaction?

Accepted Answer

It increases the rate of reaction

Answer

It has no effect on the rate of reaction

Answer

It decreases the rate of reaction

Answer

It only affects the color of the reaction

Question 10

Which of the following is an example of a reaction that is accelerated by a higher temperature?

Accepted Answer

Baking bread

Answer

Freezing water

Answer

Mixing salt and water

Answer

Turning on a lightbulb

Question 11

What happens to the rate of a chemical reaction when the temperature is increased?

Accepted Answer

It increases the rate of reaction

Answer

It decreases the rate of reaction

Answer

It has no effect on the rate of reaction

Answer

It only affects the color of the reaction

Question 12

Which of the following statements is true regarding the effect of temperature on the rate of a chemical reaction?

Accepted Answer

Increasing temperature generally increases the rate of reaction

Answer

Decreasing temperature generally increases the rate of reaction

Answer

Increasing temperature always decreases the rate of reaction

Answer

Temperature has no effect on the rate of reaction

Question 13

How does temperature affect the rate of a chemical reaction?

Accepted Answer

It increases the rate of reaction

Answer

It has no effect on the rate of reaction

Answer

It only affects the color of the reaction

Answer

It decreases the rate of reaction

Question 14

What happens to the rate of a chemical reaction when the temperature is decreased?

Accepted Answer

It decreases the rate of reaction

Answer

It increases the rate of reaction

Answer

It only affects the color of the reaction

Answer

It has no effect on the rate of reaction

Question 15

According to collision theory, what is the effect of increasing the temperature on reaction rate?

Accepted Answer

It increases the reaction rate

Answer

It stabilizes the reaction rate

Answer

It decreases the reaction rate

Answer

It has no effect on the reaction rate

Question 16

What effect does a decrease in reactant concentration have on the reaction rate?

Accepted Answer

It decreases the reaction rate

Answer

It has no effect on the reaction rate

Answer

It stabilizes the reaction rate

Answer

It increases the reaction rate

Question 17

How does an increase in temperature affect the reaction rate?

Accepted Answer

It increases the reaction rate

Answer

It has no effect on the reaction rate

Answer

It stabilizes the reaction rate

Answer

It decreases the reaction rate

Question 18

How does a decrease in temperature affect the reaction rate?

Accepted Answer

It decreases the reaction rate

Answer

It increases the reaction rate

Answer

It has no effect on the reaction rate

Answer

It stabilizes the reaction rate

Question 19

What happens to the reaction rate when the temperature is lowered?

Accepted Answer

It decreases the reaction rate

Answer

It has no effect on the reaction rate

Answer

It stabilizes the reaction rate

Answer

It increases the reaction rate

Question 20

According to collision theory, how does an increase in temperature affect the frequency of collisions between reactant molecules?

Accepted Answer

It increases the frequency of collisions

Answer

It decreases the frequency of collisions

Answer

It has no effect on the frequency of collisions

Answer

It stabilizes the frequency of collisions

Question 21

Which factor affects the reaction rate according to collision theory?

Accepted Answer

Concentration of reactants

Answer

Size of the container

Answer

Temperature of the surroundings

Answer

Presence of a catalyst

Question 22

How does the presence of a catalyst affect the reaction rate?

Accepted Answer

It increases the reaction rate

Answer

It has no effect on the reaction rate

Answer

It decreases the reaction rate

Answer

It stabilizes the reaction rate

Question 23

According to collision theory, how does increasing the concentration of reactants affect the reaction rate?

Accepted Answer

It increases the reaction rate

Answer

It stabilizes the reaction rate

Answer

It decreases the reaction rate

Answer

It has no effect on the reaction rate

Question 24

How does the size of reactant particles affect the reaction rate according to collision theory?

Accepted Answer

Smaller particles have a higher reaction rate

Answer

Particle size stabilizes the reaction rate

Answer

Particle size has no effect on the reaction rate

Answer

Larger particles have a higher reaction rate

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