Exothermic & Endothermic Reactions (AQA GCSE Chemistry): Flashcards

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Endothermic reactions
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Endothermic reaction

Reaction that takes in energy from surroundings

Surroundings temp. in endothermic reaction

Goes down/decreases

Product energy vs reactant energy (endothermic)

Products have more energy

Endothermic energy profile direction

Upward from reactants to products

Thermal decomposition

Heat breaks compound into simpler substances

CaCO3\text{CaCO}_3 decomposition equation

CaCO3→CaO+CO2\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2

Why cold packs feel cold

Dissolving absorbs energy from skin

Endothermic lab sign: thermometer

Reading decreases

Endothermic lab sign: container feel

Cold to touch

Where does energy go in endothermic reactions?

Absorbed from surroundings

ENdothermic mnemonic

ENergy goes IN

Reactants' energy level (endothermic profile)

Lower energy level

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