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Chemical world
Reactions can transfer energy
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EXOTHERMIC
Energy goes OUT to the surroundings.
The surroundings usually warm up.
Example: a fuel burning.
ENDOTHERMIC
Energy goes IN from the surroundings.
The surroundings usually cool down.
GETTING STARTED
Activation energy is the minimum energy particles need to react.
A reaction can need energy to start and still release energy overall.