Rate of Reaction

Jamie Z 2024-02-25

Learning Goals

• To describe the kinetic molecular theory of matter and collision theory
• Explain how varying conditions present during chemical reactions

Rate of Reaction

• The speed at which an reaction proceeds is known as the rate of reaction
• We can measure the rate of reaction by looking at how fast reactants are used up, or how fast products are used up

Collision theory

• Reactions happen when particles collide
• If the energy of a collision is high enough, the particles can break their bonds or from new bonds and form as different substances

• Collision theory is a model used to explain the mechanism by which a chemical reaction occurs, why the rate of reaction might change

For a Reaction to Occur

1. Reactants must collide and the collision needs to be effective
2. Not every collision results in a reaction; There must be a certain minimum energy
3. The colliding particles must be correctly orientated

Reaction Speed

• Frequency of collisions between particles
• The energy with which particles collide

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Factors that control the Rate of Reaction

Concentration	Surface Area	Pressure	Temperature	Catalyst
Increases the number of particles	More particles are exposed	Particles are closer/further away from each other	Particles move faster	Lowers activation energy (Catalyst will not be used up)
More effective collisions	Increase in collisions	Particles are forced to collide together	More collisions per second	Provide alternate reaction mechanism