COLLISION THEORY

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COLLISION THEORY

• Surface Area and Reaction Rate

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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 center.

• So there are MORE EFFECTIVE COLLISIONS
  per second.

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• Smaller particles have a bigger surface area than
  larger particle for the same mass of solid.

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Bread and Butter Theory

• Take a loaf of bread and cut it into slices. With
  each new slice, you get an extra surface to
  spread butter.
• The thinner the slices, the more slices you get
  and so the more butter you can put on them.
• By chewing your food you increase the surface
  area so that digestion can go faster.