Physical change

Definition

A physical change is a change in the form or state of matter that does not alter the chemical composition of the substance. Examples include changes in state, such as melting, freezing, and boiling.

5 Must Know Facts For Your Next Test

1. Physical changes only affect the physical properties of a substance, not its chemical structure.
2. Common examples of physical changes are phase transitions like melting, boiling, and freezing.
3. During a physical change, no new substances are formed.
4. Physical changes are generally reversible processes.
5. Changes in shape, size, and phase (solid, liquid, gas) are typical manifestations of physical changes.

Review Questions

• What distinguishes a physical change from a chemical change?
• Can you list three examples of common physical changes?
• Why are physical changes usually considered reversible?

Related terms

Chemical Change: A process where one or more substances are altered fundamentally to form new substances with different properties.

Phase Transition: A type of physical change where a substance transforms from one state of matter (solid, liquid, gas) to another.

Reversible Change: A process that can be undone or returned to its original state without altering the substance's chemical identity.