As a subject matter expert in chemistry, I can explain that sugar dissolving in water is an example of a solution. A solution is a homogeneous mixture of two or more substances. The substance that gets dissolved, in this case, sugar (sucrose), is called the solute. The substance in which the solute dissolves, which is water here, is known as the solvent. The process by which the solute disperses into the solvent is called dissolving. When sugar dissolves in water, the sugar molecules are evenly distributed throughout the water, resulting in a uniform and stable mixture.

read more >>

For example: When water (H2O) changes from solid ice to liquid water, that is a physical change. The chemical makeup (hydrogen and oxygen) is not altered. When salt and sugar dissolve in water it is a physical change. The chemical makeup of the salt and sugar are not changed.read more >>