Question

Increasing the _________________ of a reactant exposes more of it to the reaction taking place.

a. catalyst
b. surface area
c. concentration
d. heat

Answer 1

I would go with B as more of the reactant is exposed per mol. A catalyst provides and alternate reaction path that reduces the activation energy but not necessarily exposes more of the reactant. Increasing the concentration wont increase the amount of exposed area nor will increasing the tempurature.