Energy Changes and Reactions — AQA GCSE Combined Science: Synergy 8465
AQA GCSE Combined Science: Synergy · 8465
Energy Changes and Reactions
What you need to know
Distinguish between endothermic and exothermic reactions based on the temperature change of the surroundings.
Understand the principle of conservation of energy in chemical reactions, recognizing that the total amount of energy remains constant.
Describe an exothermic reaction as one that gives out energy to the surroundings, heating up the reaction mixture (e.g., neutralisation of an acid with an alkali).
Describe an endothermic reaction as one that takes in energy from the surroundings, cooling the reaction mixture (e.g., the reaction of citric acid and sodium hydrogen carbonate).
Identify examples of exothermic and endothermic reactions based on experimental temperature changes.
Investigate the variables that affect the temperature changes of a series of reactions in solutions, such as acid plus metals, acid plus carbonates, neutralisations, and displacement reactions.
