COLLISION THEORY

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COLLISION THEORY
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Solids
Matter
Liquids
is made of
Which are arranged differently in
Particles
Gases
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Simple Collision Theory
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Increase temperature

• Particles have more energy.
• Particles move faster.
• Particles have MORE EFFECTIVE COLLISIONS PER
  SECOND.

Low Temperature
High Temperature
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Increase concentration

• If a reactant is more concentrated
• particles are more crowded
• so there are MORE EFFECTIVE COLLISIONS PER
  SECOND!

High concentration
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Increase surface area
Low surface area
High surface area

• If surface area is high (as in a powder), less
  particles will be trapped in the centre.

• So there are MORE EFFECTIVE COLLISIONS
  per second.