RATES OF REACTION

Question 1

What are the 5 factors that affect rate of reaction?

Answer 1

Temperature
Surface area
Catalysts
Concentration
Pressure

Question 2

Collision theory

Answer 2

Chemical reactions can only occur when reacting particles collide with each other and with sufficient energy

Question 3

Activation energy

Answer 3

The amount of energy required that particles must have to react with

Question 4

How does concentration affect the rate of reaction?

Answer 4

Increasing the concentration increases the frequency of collisions and makes the collisions more energetic, and increases the rate of reaction

Question 5

What are catalysts?

Answer 5

Substances that speed up chemical reactions without being changed or used up during the reaction

Question 6

How do catalysts affect the rate of reaction?

Answer 6

They decrease the activation energy; this increases the proportion of particles with energy to react. They provide an alternate pathway for a chemical reaction that has a lower activation energy

Question 7

How does the pressure affect the rate of reaction?

Answer 7

If the pressure increases, the particles have less room to move around in meaning there will be more frequent collisions

Question 8

How does temperature affect the rate of reaction?

Answer 8

If the temperature is increased, there is more kinetic energy put into the reacting particles, providing more frequent collisions and therefore overcoming the activation energy.

Question 9

How does concentration affect the rate of reaction?

Answer 9

If there is a higher concentration, there is less room for the particles to move around in and therefore collisions will be more frequent, speeding up the reaction