Potential energy diagram worksheet: which arrow shows ΔH?

An example figure from the Potential Energy Diagram generator.

Potential energy diagram of an exothermic reaction with three arrows lettered A, B and C for the activation energy, ΔH and the reverse activation energy — An exothermic reaction with its three arrows lettered for a question: A, the activation energy, from the reactants up to the transition state; B, ΔH, from the reactants down to the products; and C, the reverse activation energy, from the products up to the transition state. Students say which arrow shows which energy and read the values from the numbered axis.

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Answer key

ΔH = −30 kJ/mol: exothermic
Eₐ (forward) = 100 kJ/mol
Eₐ (reverse) = 130 kJ/mol

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