# Chemistry - Rate of Reaction

• Created by: Kalitise
• Created on: 07-06-18 17:48
What is a catalyst?
A catalyst is a substance which when added to a reaction, speeds up the reaction without being used up?
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What is the average rate formula?
Average Rate = ^quantity/^time (^=change)
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What happens when you increase the temperature in a reaction. Why does this happen?
The reaction will speed up. This happens because the rise in temperature increases the kinetic energy of the particles which causes more collisions.
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What four things can be done to increase the rate of reaction?
1. Decrease the particle size 2. Increase the concentration 3. Increase the temperature 4. Add a catalyst
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When would increasing the rate of reaction be useful?
In industry where it is often required to make as much product as possible in as little time as possible.
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Can a catalyst be used more than once?
Yes - they do not get used up during a reaction.
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What does using a catalyst allow you to do?
Using a catalyst allows you to carry out the reaction at a lower temperature saving energy.
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Why does the metal on the bottom of a pot often rust when used on a gas cooker?
Because the heat speeds up the process of corrosion.
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why does decreasing the particles size speed up a reaction?
Because it increases the surface area allowing the particles to collide more quickly.
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Why does increasing the concentration speed up a reaction?
Because there are more particles in a more concentrated solution to collide.
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Why does increasing the temperature speed up a reaction?
Because it increases the kinetic energy of the particles causing more collisions
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Why does using a catalyst speed up a reaction?
Catalysts change how a reaction happens.
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## Other cards in this set

### Card 2

#### Front

What is the average rate formula?

#### Back

Average Rate = ^quantity/^time (^=change)

### Card 3

#### Front

What happens when you increase the temperature in a reaction. Why does this happen?

### Card 4

#### Front

What four things can be done to increase the rate of reaction?

### Card 5

#### Front

When would increasing the rate of reaction be useful?