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Chemistry · Triple Science

Energy Changes

Spec 4.5 Paper 1 📗 Foundation

Subtopics

Exothermic and Endothermic ReactionsSpec 5.5.1.1Define exothermic and endothermic reactions, give examples and describe their energy changes. + Reaction ProfilesSpec 5.5.1.2Draw and interpret reaction profile diagrams for exothermic and endothermic reactions. + Cells and BatteriesSpec 4.5.2.1Describe how chemical cells and batteries produce electrical energy and factors affecting voltage. + Fuel CellsSpec 4.5.2.2Describe how hydrogen fuel cells work and evaluate their advantages and disadvantages. +

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Key Equations

ΔH = energy in (breaking) − energy out (forming)

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