exothermic and endothermic reactions

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exothermic reaction

heat energy is released during the reaction…enthalpy change is negative

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endothermic reaction

heat energy is absorbed during the reaction…enthalpy change is positive

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enthalpy change

heat energy transferred during a chemical reaction…products - reactants

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activation energy

minimum energy that colliding particles must possess to break bonds to start a chemical reaction

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exothermic energy level diagram

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endothermic energy level diagram