Science MCQs

A physical change alters only physical properties like size shape or state without changing composition.

Melting ice changes state from solid to liquid but remains H₂O a physical change.

A chemical change produces one or more new substances with different properties.

Burning coal produces ash and gases new substances indicating a chemical change.

Gas formation color change or energy release are clues to chemical changes.

Rusting forms iron oxide a new substance so it is a chemical change.

Freezing changes the state of water but not its composition a physical change.

Dissolving is physical; the salt can be recovered by evaporation.

Burning produces new substances like smoke and ash a chemical change.

Melting wax can be reversed by cooling a physical reversible change.