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GCSE Chemistry · key term
The number of collisions between particles in a given time.
Used by AQA, Edexcel and OCR
Specification 4.6.1.3 · Paper 2
Revise: Collision TheoryLowering the pressure spreads them out and reduces the collision frequency. These concentration and pressure explanations concern how often particles meet; they do not require the collisions to become more energetic.
Specification 7.3, 7.4 · Paper 2
The number of collisions occurring in a given time.
For each factor, link the change to collision frequency and/or energy, then state its effect on rate.
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Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The number of collisions occurring in a given time, such as each second.
Revise: Collision theory explanationDiluting the solution reduces collision frequency and slows the reaction.