Rates of Reaction (mocks)

Question 1

How and why does surface area affect the rate of reaction?

Answer 1

Only the surface particles of a substance can react, so increasing the surface area increases the number of particles available to react. This increases the frequency of successful collisions

Question 2

How and why does temperature affect the rate of reaction?

Answer 2

Increased temperatures mean particles can move around more quickly. This means more particles meet the activation energy and the frequency of successful collisions increases

Question 3

How and why does concentration affect the rate of reaction?

Answer 3

Increased concentration means there are more particles in the same volume, so more particles per unit volume. This means the frequency of successful collisions increases

Question 4

How and why does pressure affect the rate of reaction?

Answer 4

Increasing the pressure means there are the same amount of particles in a smaller volume, so more particles per unit volume. This means the frequency of successful collisions increases.

Question 5

How and why do catalysts affect the rate of reaction?

Answer 5

Catalysts reduce the activation energy required for the reaction to take place by providing an alternate pathway. This means more particles meet the required activation energy and the frequency of successful collisions increases.

Question 6

Write a method for working out how the concentration of an acid affects the rate of reaction