Question

Which of these outcomes is conclusive evidence that mixing sugar in water is a physical change? There is no change in color. There is no precipitate formed. There is no gas given off. There is no molecular change.

Answer 1

When sugar is mixed with water, there is one significant fact that should be noted. The molecules do go apart but they don’t change, which establishes this fact that mixing water and sugar bring about only a physical change.

Sugar just changes its form, and not its identity. If you want sugar back from the solution, heat the solution, you will get back sugar after water evaporates.