2. Fill in the Chart MoleculesDefinite Shape ?Definite Volume? Solid Liquid Gas

3. Think About It What happens to a puddle of water on a sunny day? What happens to ice on a warm day? What happens to a pond in very cold temperatures?

5. Changes between Solids & Liquids Melting: change in state from a solid to a liquid Melting occurs at a specific temperature called, melting point A change from a solid to a liquid involves an increase in thermal energy

6. Changes between Solids & Liquids Freezing is the change of state from liquid to a solid A change from a liquid to a solid is a decrease in thermal energy

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8. Changes between Liquid & Gas Vaporization takes place when the particles in a liquid gain enough energy to form a gas. Vaporization that only occurs on the surface is called evaporation Example: Shrinking puddle

9. Changes between Liquid & Gas Vaporization takes place when the particles in a liquid gain enough energy to form a gas. Boiling: from a liquid to a gas below its surface and at the surface Boiling point: temperature at which a liquid boils

10. Changes between Liquid & Gas The opposite of vaporization is called condensation. Condensation occurs when particles in a gas lose thermal energy to form a liquid

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12. Changes between Solid & Gas Sublimation, particles of a solid that go directly to a gas