Question

For a reaction for which the activation energies of forward and reverse reactions are equal:

• A. $\Delta H=0$
• B. $\Delta S=0$
• C. the order is zero
• D. there is no catalyst

Answer 1

Answer: (A)

$\Delta H=0$

For a reaction for which the activation energies of forward and reverse reactions are equal, then both $\Delta H$ and $\Delta S$ are $0$.
The activation energy is the energy it takes to push the reactants up to the transition state.
For Exothermic reaction = negative $\Delta H$
Endothermic reaction = positive $\Delta H$