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Rate of Reactions

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

O-Level 6092 (2026) / SEC G3 K324 (2027)

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5 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.

  4. Catalysts provide an easier reaction pathway

    They change the rate without being used up overall.

    Pure only

  5. Plan a fair rate investigation

    A plan must say how the measurements will support a conclusion.

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Scope and references

Learning outcomes and sources

10. Rate of Reactions (6092 / K324). Use the outcome map to find the explanation for a particular syllabus requirement.

See the learning outcome map

  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) Define catalysts and their effects

    • Rate increase
    • Chemically unchanged overall
    • Enzymes included

    Catalysts provide an easier reaction pathway

  3. 10(c) Explain lower activation energy

    • Alternative pathway
    • More successful collisions

    Catalysts provide an easier reaction pathway

  4. 10(d) Recognise catalyst applications

    • Industrial processes
    • Enzymes as biological catalysts

    Catalysts provide an easier reaction pathway

  5. 10(e) Design rate investigations

    • Choose variable and method
    • Control confounders
    • Measurements and analysis

    Plan a fair rate investigation

  6. 10(f) Interpret rate data

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

    Choose a changing quantityRead slope and final amount separately