Chemistry - Rates of Reaction

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  • Created by: becky.65
  • Created on: 28-10-15 14:27
What does the rate of reaction measure?
The speed or how fast a reaction is
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What are the two ways to find the rate of reaction?
1) amount of reactant used/time 2) amount of product formed/time
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What is the collision theory?
A theory that states reactions can only take place if particles collide with enough energy to change into new substances
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What is the minimum energy they need to react called?
The activation energy
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How does surface area affect the rate of reaction?
The larger the surface area, the more collisions that can take place because there are more surfaces for the reactions to take place on
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Does a powder or large lumps of a substance have a fast rate of reaction?
A powder because the finer the powder the more surfaces to react on
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How does temperature affect the rate of reaction?
Increasing the temperature increases the speed of the particles in a reaction mixture which means they collide more often and with more energy, which increases the rate of reaction
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How does concentration affect the rate of reaction?
If the concentration of a solution is increased there are more particles dissolved in the same volume and this means the dissolved particles are closer together so they collide more often
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How does the pressure of a gas affect the rate of reaction?
Increasing the pressure of a gas puts more molecules into the same volume so they collide more frequently
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What do catalysts do?
They change the rates of chemical reactions by lowering the activation energy of the reaction so that more of the collisions result in a reaction
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Why can catalysts be used over and over again?
Because it changed the rate of reaction but it is not used up so the catalyst is left at the end of the reaction
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Card 2

Front

What are the two ways to find the rate of reaction?

Back

1) amount of reactant used/time 2) amount of product formed/time

Card 3

Front

What is the collision theory?

Back

Preview of the front of card 3

Card 4

Front

What is the minimum energy they need to react called?

Back

Preview of the front of card 4

Card 5

Front

How does surface area affect the rate of reaction?

Back

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