This key facts covers Key Facts: Exothermic Reactions within Exothermic Reactions for GCSE Chemistry. Revise Exothermic Reactions in Energy Changes for GCSE Chemistry with 20 exam-style questions and 14 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 7 of 12 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 12
Practice
20 questions
Recall
14 flashcards
📌 Key Facts: Exothermic Reactions
- Temperature increases — the reaction mixture and surroundings get warmer
- Energy is released — transferred from reaction to surroundings
- ΔH is negative — enthalpy change is less than zero (e.g., ΔH = -400 kJ/mol)
- Energy profile dips down — products lower than reactants on diagram
- Everyday uses: Hand warmers, self-heating cans, heating pads
- Reversible exothermic — if reversed, the reaction is endothermic