# Effect of temperature - higher tier

The rate of a chemical reaction can be changed by altering the temperature. If the temperature is increased:

• the reactant particles move more quickly
• they have more energy
• there are more successful collisions per unit time
• the rate of reaction increases

Compared to a reaction at a low temperature, the graph line for the same reaction but at a higher temperature:

• has a steeper gradient at the start
• becomes horizontal sooner

This shows that the rate of reaction was greater at the higher temperature.