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Rate of reaction

Measuring the mass of a reaction mixture:

The mass will decrease.

Measuring the volume of gas given off:

We know a gas is produced because bubbles are formed.

Measuring the light transmitted through a solution:

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amount of reatant used or product formed
Rate of reaction = time

Things which affect reaction time:

Concentration or pressure
Surface area
The presence of a catalyst

Collision theory: the theory that particles don't just need to collide to react, but they
need to collide with a certain amount…

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