Changing State The change between a solid liquid

Changing State

The change between a solid, liquid and gas is a change of state. • This is a physical change • The particles themselves do not change in any way – only their movement and the amount of energy they have changes.

For a change of state to occur energy must be added or removed.

Expansion and Contraction Balloon Experiment

Expansion & Contraction • Heating results in expansion. • Cooling results in contraction. • Heat energy effects the movement of the particles whether they be in solid, liquid or gas form.

Gaining Energy • What happens to an ice cube if you leave it out in the sun? MELTING or LIQUEFYING refers to a solid becoming a liquid.

Gaining Energy • What happens if you heat up a pot of water? BOILING or VAPORISING refers to a liquid turning into a gas.

Gaining Energy • What is evaporation? EVAPORATION is vaporisation without boiling. • Can you think of an example of evaporation taking place in everyday life?

Losing Energy • What is happening when water droplets gather on the outside of a cold glass? CONDENSATION occurs when a gas turns to a liquid.

Losing Energy How does a liquid turn into a solid? FREEZING or SOLIDIFYING is the process of a liquid turning into a solid.

Sublimation • Some substances sublime. This means they go from solid to gas without going through a liquid phase. • The reverse is called deposition.