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Combined Science Chemistry

Chemistry study notes

Rate of Reactions

Explain why reactions speed up, and read what a progress graph actually proves.

O-Level 5086 / 5088 (2026) / SEC G3 K326 / K328 (2027)

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3 topics

  1. Explain a rate change using collisions

    Changing a condition changes how often particles react.

  2. Choose a changing quantity

    Match the measurement to the reaction.

  3. Read slope and final amount separately

    A plateau means product formation has stopped, not that nothing happened.

Scope and references

Learning outcomes and sources

10. Rate of Reactions (5086 / 5088 / K326 / K328). Use the outcome map to find the explanation for a particular syllabus requirement.

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  1. 10(a) Explain rate factors

    • Concentration
    • Gas pressure
    • Particle size/surface area
    • Temperature
    • Collisions between reacting particles

    Explain a rate change using collisions

  2. 10(b) Interpret rate data

    • Volume/mass/time measurements
    • Gradient and plateau
    • Measurement limitations

    Choose a changing quantityRead slope and final amount separately