# Collision theory and Catalysts

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• Created by: Elca
• Created on: 10-05-15 16:53
More collisions increases the rate of reaction
The effects of temperature, concentration and surface area on the rate of reaction can be explained in terms of how often the reacting particles collide successfully
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Higher temperature increases collisions
When the temperature is increased the particles all move quicker. If they're moving quicker, they're going to collide more often
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Higher concentration (or pressure) increases collisions
If a solution is made more concentrated it means there are more particles of reactant knocking about between the water molecules which makes collisions between the important particles more likely
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Larger surface area increases collisions
If one of the reactants is a solid then breaking it up into smaller pieces will increase the total surface area. This means the particles around it in the solution will have more area to work on, so there'll be more frequent collisions
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Faster collisions increase the rate of reaction
Higher temperature also increases the energy of the collisions, because it makes all the particles move faster
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Catalysts speed up reactions
Many reactions can be speeded up by adding a catalyst. A solid catalyst works by giving the reacting particles a surface to stick to
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## Other cards in this set

### Card 2

#### Front

When the temperature is increased the particles all move quicker. If they're moving quicker, they're going to collide more often

#### Back

Higher temperature increases collisions

### Card 3

#### Front

If a solution is made more concentrated it means there are more particles of reactant knocking about between the water molecules which makes collisions between the important particles more likely

### Card 4

#### Front

If one of the reactants is a solid then breaking it up into smaller pieces will increase the total surface area. This means the particles around it in the solution will have more area to work on, so there'll be more frequent collisions

### Card 5

#### Front

Higher temperature also increases the energy of the collisions, because it makes all the particles move faster