Physical and Chemical Changes Year 8

Physical Changes

• substance has the same particles but looks different

• physical changes can happen when forces are applied

break down into smaller pieces

change state of matter

• most physical changes are reversible

• 3-dimensional arrangement of particles in a regular pattern is called "lattice"

Vaporisation

• a liquid evaporates in a gas ( the liquid has vaporised into water vapour)

• vapours that are smelly are called "fumes"

• anything that vaporise easily is called "votalie substance"

Condensation

• A gas becomes a liquid (the gas has condensed, generally by cooling).

Melting

• solid is heated to become a liquid (the solid has melted).

Solidification

• a liquid loses heat to become a solid, sometimes called freezing

Sublimation

• some substance don't exist as liquid, only changes from a solid to gas or gas to solid. (Carbon dioxide and diamond)

Chemical Changes

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