Energy Diagrams

AP Chemistry· difficulty 1/5

H reactants products

The reaction depicted is:

  • A

    Exothermic; ΔH < 0

  • B

    Endothermic; ΔH > 0

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  • C

    Spontaneous regardless of T

  • D

    At equilibrium

Explanation

Products lie above reactants on the enthalpy axis, so ΔH is positive (endothermic).

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