Energy ChangesTopic Summary
Topic Summary: Exothermic Reactions
Part of Exothermic Reactions — GCSE Chemistry
This topic summary covers Topic Summary: 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 12 of 12 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 12 of 12
Practice
20 questions
Recall
14 flashcards
Topic Summary: Exothermic Reactions
Key Terms
- Exothermic — releases energy to surroundings
- ΔH — enthalpy change (negative for exothermic)
- Activation energy (Ea) — minimum energy to react
- Energy profile — diagram of energy changes
- Surroundings — everything outside the reaction
Must-Know Facts
- Temperature of surroundings INCREASES
- Products have LESS energy than reactants
- ΔH is NEGATIVE
- Products are LOWER on energy profile
- Examples: combustion, neutralisation, respiration
- Energy made making bonds > energy needed breaking bonds