Ace the BMAT 2026 – Unleash Your Biomedical Superpowers!

Increasing the surface area of a reactant enhances the reaction rate due to the greater exposure of reactant particles to one another. When the surface area is larger, there are more particles available for collision, which increases the likelihood of effective interactions between reactants. This is particularly important in reactions involving solids, where only the surface particles are available for reaction.

For example, powdered solid reactants will react more quickly than large chunks of the same material because the powdered form offers a larger surface area. In essence, a greater surface area facilitates more frequent collisions and increases the probability of reactions taking place.

The other options convey aspects that do not hold true in this context, as a decrease in surface area would limit interaction and potentially slow the reaction, while an unchanged surface area would not provide the same advantages realized through increased surface exposure.