Chapter 10

Question 1

What is the rate of reaction?

Answer 1

1) how fast a reactant is used up
OR
2) how fast a product is formed

Question 2

rate =

Answer 2

change in concentration / time

Question 3

What are the units of rate?

Answer 3

mol dm⁻³s⁻¹

Question 4

When is the rate of reaction fastest?

Answer 4

at the start of the reaction

Question 5

Why is the rate of reaction fastest at the start of the reaction?

Answer 5

each reactant is at highest concentration

Question 6

Does the rate of reaction speed up or slow down as the reaction proceeds?

Answer 6

slow down

Question 7

Why does the rate of reaction slow down as the reaction proceeds?

Answer 7

reactants are being used up + concentrations decrease

Question 8

What happens when one of the reactants has been completely used up?

Answer 8

1) concentration stop changing

2) rate of reaction = 0

Question 9

What factors change the rate of a reaction?

Answer 9

1) concentration/pressure
2) temperature
3) catalyst
4) surface area of solids

Question 10

What does the collision theory state?

Answer 10

two reacting particles must collide for a reaction to occur

Question 11

When will a collision be effective?

Answer 11

1) particles collide with correct orientation

2) particles have sufficient energy to overcome activation energy