No new substance is formed. The chemical properties remain the same. (e.g., Melting of ice, boiling of water).

These have non-uniform compositions and visible boundaries. Example: Oil in water, a mixture of sand and salt. 3. Solutions, Suspensions, and Colloids

(Mass of solute / Mass of solution) × 100

A mixture contains more than one substance mixed in any proportion.

(Mass of solute / Volume of solution) × 100 4. Physical vs. Chemical Changes