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Heat energy changes in chemical reactions Categorise
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Exothermic reactions
Endothermic reactions
Exothermic or endothermic, depending on the reaction
Used in sports injury packs
Example: Displacement
Example: Thermal decomposition
Example: Neutralisation
Reactants have greater energy than products
The temperature of the surroundings increases
Energy released in forming bonds < energy required to break bonds
Example: Salts dissolving in water
Example: Precipitation reactions
Energy released in forming bonds > energy required to break bonds
The temperature of the surroundings decreases
Products have greater energy than reactants
Used in hand warmers