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

Scope

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

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9(a) Explain exothermic processes
- Energy transferred to surroundings
- Temperature increase
- NaOH with HCl
Follow the energy transfer Investigate an energy change
9(b) Explain endothermic processes
- Energy absorbed from surroundings
- Temperature decrease
- Ammonium nitrate dissolving
Follow the energy transfer Investigate an energy change