Physical Changes | NemoQuiz

Physical changes do not result in the formation of a new chemical substance.

Example physical changes:

Phase changes: boiling, melting, evaporation, condensation, sublimation. If you melt a chunk of lead, it’s still lead. It still has the same boiling and melting point and still has metallic properties (conductivity, high density, etc). The lead atoms haven’t combined with other atoms to make a new substance.
Changing the shape: shattering, bending, flattening, tearing, twisting, etc.
Mixing: If you mix iron filings with sand, then all you have in the end are the same two substances, except now they’re together in the same container. The sand still has all of the properties of sand(yellowish color, hard, dense, brittle) and the iron still has its properties (silvery, shiny, magnetic, hard, dense, bendable). You have the same two substances that you started with, and no new substances.
Dissolving is just a specific type of mixing. If you dissolve sugar in water, it’s still sugar, and the water molecules are still water. The sugar has broken up into individual sugar molecules instead of being clumped together, but they are still the same molecular substance.