1. Chapter 3.2 – Changes of State
change of state –
conversion of a substance from one physical form to another
during a change of state the identity of a substance does not change but the energy of the substance does
if energy is added or removed the substance heats or cools

2. Chapter 3.2 – Changes of State
evaporation – change from a liquid to a gas sublimation – process where a solid changes directly into a gas condensation – change from a gas to a liquid

3. Chapter 3.2 – Changes of State

4. Chapter 3.2 – Changes of State
during a change of state the temperature of a substance does not change
condensation and
freezing release heat
- melting and evaporation
absorb heat

5. Chapter 3.2 – Changes of State
law of conservation of mass – mass cannot be created or destroyed - total mass before and after a physical or chemical change is the same law of conservation of energy – energy cannot be created or destroyed - total energy before and after a physical or chemical change is the same