Chemical change and reactions

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  • Created by: megrogers
  • Created on: 08-02-17 18:07
What happens to particles as the temperature increases
They collide with more energy so react more
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How can you tell how fast a chemical reaction is
look at how fast a product is made - calculate the rate
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What makes a chemical reaction happen
particles must collide, the particles must have enough energy to collide
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What is the smallest amount of energy a partical needs called
activation energy
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What does the collision theory describe
How the reactants are changed into products
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Anything that increases the number of collisions will make the reaction occur more quickly , how?
Adding more particles- Increases the concentration or pressure Making the particles move more- Increasing the temperature Making the surface area bigger (use smaller particles) Add a catalyst- lowers the energy needed
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In terms of particles explain how chemicals react and why increasing the temerature or concentration will increase the rate of reaction
1. Chemicals react when 2 reactants collide with enough energy. 2. When particles are at a high temperature they have more kinetic energy which means the reaction occurs quickly. 3. If particles are at a low temperature they are slow moving
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Use the idea of particles to explain how the rate of reaction is changed when we use a catalyst and when we increase the surface area of a reactant
1. When chemicals react they must collide with enough energy to make products. This idea is called the collision theory. 2. A catalyst helps speed up the reaction by helping the collisions- they reduce how much energy the collision needs so making
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Card 2

Front

How can you tell how fast a chemical reaction is

Back

look at how fast a product is made - calculate the rate

Card 3

Front

What makes a chemical reaction happen

Back

Preview of the front of card 3

Card 4

Front

What is the smallest amount of energy a partical needs called

Back

Preview of the front of card 4

Card 5

Front

What does the collision theory describe

Back

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