For a certain one-step reaction

CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics

Problem

For a certain one-step reaction, the uncatalyzed pathway has an activation energy of

95\,\text{kJ}

, whereas a catalyzed pathway lowers the activation energy to

60\,\text{kJ}

. Which statement most accurately compares the uncatalyzed and catalyzed energy profiles? (a) Both profiles begin and end at the same energies, but the catalyzed profile has a lower peak by

55\,\text{kJ}

. (b) Both profiles reach the same peak energy; the catalyst only lowers the energy of the products by

35\,\text{kJ}

. (c) Both profiles begin and end at the same energies, but the catalyzed profile has a lower peak by

35\,\text{kJ}

. (d) The catalyzed pathway raises the transition-state energy, giving a peak that is

35\,\text{kJ}

higher than in the uncatalyzed pathway.

Related theory

Collision Theory
Chemical Kinetics
Collision Theory of Chemical Reactions

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