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Exothermic and endothermic reactions Categorise
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Exothermic reactions
Endothermic reactions
The temperature of the surroundings decreases
Example: Citric acid + sodium hydrogencarbonate
Energy released in forming bonds < energy required to break bonds
Used in sports injury packs
Reactants have greater energy than products
Example: Thermal decomposition
Example: Combustion
The temperature of the surroundings increases
Products have greater energy than reactants
Example: Neutralisation
Used in hand warmers