# C2- Six ways to increase rate of reaction

In a C2 exam, you may be asked to name and explain a few ways that you can increase the rate of a reaction.

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• Created by: antiana
• Created on: 04-01-11 17:30

## 1.

Concentration

Increase in concentration causes an increase in the rate of a reaction because there will be more reactant particles in the same amount of space (volume) and so there is a greater chance of a collision occurring. The more collision there are per second, the faster a reaction can occur.

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## 2.

Pressure-

(Only works for reactions involving gases)
Increase of pressure causes an increase in the rate of a reaction because there will be more reactant particles in the same amount of volume and so there is a greater chance of collision occurring.

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## 3.

Temperature-

Increase in temperature causes an increase in the of a reaction. This is because the reactant particles are moving more quickly, there is a greater chance of collision occurring. Also, for collision to lead a reaction, it must have sufficient energy to overcome the activation energy barrier. On average, the particles move more quickly in a hot substance.

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## 4.

Stirring-

Stirring cause an increase in the rate of a reaction because there is a greater chance of collision.

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## 5.

Crushing-

Breaking a solid into small pieces exposes a greater surface area to attack by a liquid or gas.

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## 6.

Catalyst-

Using a catalyst increases the rate of a reaction because it lowers the activation energy barrier. (It is a good idea to give a specific example if possible since only certain reactions have a suitable catalyst available). As an example, if 10% of the particles have sufficient energy to react without a catalyst present any reduction in the energy requirement means that a higher percentage of the particles will be able to react and do the reaction will be faster.

Define: Catalyst

A substance that initiates or accelerates a chemical reaction without itself being affected.

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