Chemistry

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  • Created by: emmapxc
  • Created on: 26-03-16 12:21
What is the Collision Theory?
For a chemical reaction to occur the reacting particles must collide into each other with sufficient kinetic energy and with the correct alignment.
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What occurs when you increase the concentration?
Increasing concentration, increases the rate of reaction. There are more reacting particles in a given volume so more collisions can take place.
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What occurs when pressure is increased?
Increasing pressure, increases rate of reaction. There are more reacting particles in a given volume.
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What occurs when surface area is increased?
Increasing surface area, increases rate of reaction. There is a larger number of particles on the surface of the solid that are able to take part in collisions.
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What occurs when temperature is increased?
Increasing temperature, increases rate of reaction. Particles will have a greater kinetic energy so collision between reacting particles are more likely to be successful.
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How do you measure the relative rate of reaction?
1 / time taken for reaction
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What does a potential energy diagram show?
It shows the energy pathway for a chemical reaction, how the potential energy changes as the reactants change into products.
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What is enthalpy?
Enthalpy (H) is a measure of the chemical potential energy obtained in a substance.
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How do you calculate enthalpy change?
ΔH = HP - HR
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What is an exothermic reaction?
Chemical potential energy is changed into heat. Energy is released to the surroundings.
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Card 2

Front

What occurs when you increase the concentration?

Back

Increasing concentration, increases the rate of reaction. There are more reacting particles in a given volume so more collisions can take place.

Card 3

Front

What occurs when pressure is increased?

Back

Preview of the front of card 3

Card 4

Front

What occurs when surface area is increased?

Back

Preview of the front of card 4

Card 5

Front

What occurs when temperature is increased?

Back

Preview of the front of card 5
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