Question

3 - energy changes and rates of reactions (part 1)

question 10 (1 point)
which graph best represents the effect of a catalyst on activation energy?
higher peak than uncatalyzed reaction
lower peak than uncatalyzed reaction
no peak at all
same peak as uncatalyzed reaction

Explanation:

A catalyst lowers the activation energy of a reaction. In a reaction energy - profile graph, the "peak" represents the activation energy. So a catalyzed reaction will have a lower peak (activation energy) compared to the uncatalyzed reaction. The option "Higher peak than uncatalyzed reaction" is incorrect as catalysts don't increase activation energy. "No peak at all" is wrong because all reactions (even catalyzed) have an activation energy (represented by a peak in the energy - profile). "Same peak as uncatalyzed reaction" is incorrect as catalysts do affect activation energy.

Answer:

B. Lower peak than uncatalyzed reaction (assuming the second option is labeled as B, if the original options had labels like A, B, C, D with the second option being B. If the labels were different, adjust accordingly. But based on the options given, the correct one is "Lower peak than uncatalyzed reaction")