* Surface Area: Sugar crystals have a much larger surface area compared to a single cube of the same mass.

* Reaction Rate: Chemical reactions occur at the interface between reactants. A larger surface area means more contact points for the reaction to happen, leading to a faster reaction rate.

Think of it like this: Imagine you're trying to dissolve sugar in water. The sugar crystals will dissolve faster because the water can interact with the sugar molecules on many surfaces. A single cube will take longer because only the outer surface is exposed to the water.