Answer:
1. Because hot water has more energy than cold water, sugar dissolves faster in hot water than in cold water. When you heat water, the molecules gain energy and travel quicker. In addition, milk cannot dissolve in all solvent because some liquid chemicals when it is added to milk the chemical properties of the solution causing it to become miscible liquid or in the colloidal state.
2. The molecules of the solute must interact with the molecules of the solvent in order for a substance to dissolve. Each material interacts with water differently and has its own distinctive solubility because it is made up of various atoms in varied configurations and linked together in different ways.
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