Effect of concentration - higher tier
The rate of a chemical reaction can be changed by altering the concentration of a reactant in solution. If the concentration is increased:
- there are more reactant particles
- there are more successful collision per unit time
- the rate of reaction increases
Compared to a reaction with a reactant at a low concentration (if a solution), the graph line for the same reaction but at a higher concentration:
- has a steeper gradient at the start
- becomes horizontal sooner
This shows that the rate of reaction was greater at the higher concentration.