C2.4 Rates and Energy

Question 1

What is activation energy?

Answer 1

The minimum energy required to start a chemical reaction

Question 2

Describe how using smaller marble chips affect the rate of reaction?

Answer 2

Increases surface area

Increases rate of reaction

Question 3

Explain how using smaller marble chips affect the rate of reaction?

Answer 3

Increases the amount of marble chips exposed

so there are more frequent collisions

Question 4

Explain how increasing temperature affects the rate of reaction?

Answer 4

Particles move faster
so collide more frequently
increasing the rate of reaction

Question 5

Explain how increasing concentration affects the rate of reaction?

Answer 5

Particles are more crowded
so collide more frequently
increasing the rate of reaction

Question 6

How do catalysts affect the rate of reaction?

Answer 6

Lower the activation energy

increasing the rate of reaction

Question 7

what is an advantage of using a catalyst to speed up a chemical reaction?

Answer 7

Uses less energy
so costs less
produces less carbon dioxide reducing global warming

Question 8

What is an exothermic reaction?

Answer 8

Transfers energy to the surroundings

Question 9

What is an endothermic reaction?

Answer 9

Absorbs energy from the surroundings

Question 10

In a reversible reaction, if the forwards reaction is exothermic, the backwards reaction is….

Answer 10

endothermic.