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GCSE Combined Science · key term
A process that absorbs energy from the surroundings. An endothermic chemical reaction has a positive overall energy change.
Used by OCR
Specification C3.2d · Chemistry Paper 1
Revise: Calculating Energy ChangesBreaking a bond requires energy, so bond breaking is endothermic. Forming a bond releases energy, so bond making is exothermic. Both happen during the same reaction.
Finish by interpreting your answer: negative means exothermic; positive means endothermic.
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