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Combined Science Chemistry

Chemistry study notes

Chemical Energetics

Explain temperature changes and the energy cost of rearranging particles.

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

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2 topics

  1. Follow the energy transfer

    A temperature change is evidence about the surroundings.

  2. Investigate an energy change

    Make the measurement large enough to interpret fairly.

Scope and references

Learning outcomes and sources

9. Chemical Energetics (5086 / 5088 / K326 / K328). Use the outcome map to find the explanation for a particular syllabus requirement.

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  1. 9(a) Explain exothermic processes

    • Energy transferred to surroundings
    • Temperature increase
    • NaOH with HCl

    Follow the energy transferInvestigate an energy change

  2. 9(b) Explain endothermic processes

    • Energy absorbed from surroundings
    • Temperature decrease
    • Ammonium nitrate dissolving

    Follow the energy transferInvestigate an energy change