AQA · Chemistry · 8462
GCSE Chemistry: Energy transfer during exothermic and endothermic reactions
Energy changes · AQA GCSE Chemistry (8462), specification point 4.5.1.1. Cards are generated from the exam board's own specification for "Energy transfer during exothermic and endothermic reactions", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What is an exothermic reaction?
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A reaction that transfers energy to the surroundings, so the temperature of the surroundings increases.
What is an endothermic reaction?
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A reaction that takes in energy from the surroundings, so the temperature of the surroundings decreases.
In an exothermic reaction, how does the energy of the products compare to the reactants?
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The products have less energy than the reactants, by the amount of energy transferred to the surroundings (energy is conserved).
The total amount of energy in the universe after a chemical reaction is ? as before it.
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the same
Is combustion an exothermic or endothermic reaction?
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Exothermic — it transfers energy to the surroundings.
Is neutralisation an exothermic or endothermic reaction?
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Exothermic.
Is thermal decomposition an exothermic or endothermic reaction?
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Endothermic — it takes in energy from the surroundings.
Is the reaction of citric acid with sodium hydrogencarbonate exothermic or endothermic?
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Endothermic — the temperature of the surroundings falls.
Give one everyday use of an exothermic reaction.
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Hand warmers (or self-heating cans).
What type of reaction are sports injury cold packs based on?
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Endothermic reactions — they take in energy, cooling the surroundings.
How can you distinguish an exothermic from an endothermic reaction experimentally?
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Measure the temperature change of the surroundings: it rises for exothermic and falls for endothermic reactions.
Many ? reactions are exothermic, alongside combustion and neutralisation.
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oxidation
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