Final answer:
Dissolving sugar in water is a physical change, not a chemical one, as it simply forms a solution without altering the chemical composition of the sugar.
Step-by-step explanation:
Dissolving sugar in water is not a chemical change; rather, it is a physical change. In a chemical change, the substances involved change their chemical properties and form new substances. However, when sugar dissolves in water, it simply forms a homogeneous mixture called a solution without changing the chemical structure of the sugar molecules. The process of dissolving is physical because it involves a change in state from solid to liquid (dissolved state) without changing the composition of the sugar.
Temperature affects the rate at which sugar dissolves in water, but not the nature of the change. The color of the sugar, whether white or brown, also does not affect the nature of the change; both dissolve physically without undergoing a chemical reaction.