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Note that your final mark will not be saved in the system.
Heat energy changes in chemical reactions Categorise
Target Level
4-5
Running Total
0
0%
Attempt
1 of 2
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Exothermic reactions
Endothermic reactions
Exothermic or endothermic, depending on the reaction
Energy released in forming bonds > energy required to break bonds
Example: Precipitation reactions
The temperature of the surroundings increases
Example: Displacement
Used in hand warmers
Products have greater energy than reactants
The temperature of the surroundings decreases
Example: Salts dissolving in water
Example: Thermal decomposition
Reactants have greater energy than products
Example: Neutralisation
Used in sports injury packs
Energy released in forming bonds < energy required to break bonds