C2.4 Rates and Energy Flashcards Preview

GCSE Chemistry AQA > C2.4 Rates and Energy > Flashcards

Flashcards in C2.4 Rates and Energy Deck (10):
1

What is activation energy?

The minimum energy required to start a chemical reaction

2

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

Increases surface area
Increases rate of reaction

3

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

Increases the amount of marble chips exposed
so there are more frequent collisions

4

Explain how increasing temperature affects the rate of reaction?

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

5

Explain how increasing concentration affects the rate of reaction?

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

6

How do catalysts affect the rate of reaction?

Lower the activation energy
increasing the rate of reaction

7

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

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

8

What is an exothermic reaction?

Transfers energy to the surroundings

9

What is an endothermic reaction?

Absorbs energy from the surroundings

10

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

endothermic.