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exothermic reactions
transfers energy to the surroundings
rise in temp in the surroundings
e.g. burning fuels (combustion) gives out lots of energy
making bonds
endothermic
takes in energy from the surroundings
fall in temp in the surroundings
less common than exothermic
breaking bonds
exothermic reaction profile

endothermic reaction profile

activation energy
amount of energy needed for a reaction to start
what is an energy/ reaction profile graph
it graphs a chemical reaction's energy changes against its progress
practice application questions on this topic