Rates of reactionCollision theory

Chemical reactions vary in speed. The rate of reaction measures how much product is made in a given time. For reactions to occur, reactant particles must collide.

Part ofChemistry (Single Science)Rate of chemical change

Collision theory

For a chemical reaction to occur, the particles must collide with each other.

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1. Two pairs of particles move towards each other
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2. The pairs collide and reform so that each member of the original pair joins with a member of the other pair, forming two new pairs
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3. The new pairs are now moving away from each other

Collision theory [Higher tier only]

Calculating and comparing rates

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Factors that affect the rate of reaction

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