Reaction Energy Profile

AP Chemistry· difficulty 4/5

On a reaction coordinate diagram, the activation energy is

  • A

    The energy of the transition state minus the energy of the reactants

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  • B

    Equal to ΔH

  • C

    Always positive for endothermic, negative for exothermic

  • D

    The energy difference between products and reactants

Explanation

EaE_a = peak energy − reactants energy. ΔH = products − reactants (different).

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