The kinetic theory of matter By the end of this lesson, you will be able to… Describe the changes of state. Explain that particles can be used to represent the states of matter and by increasing the heat energy this increases the kinetic energy the particles have Today’s Activities Demo: Frozen peas Particle Theory to Music Problem – removing jelly Definitions and examples

The Kinetic Theory of Matter All materials are made up of tiny particles. The particles stay the same whether it is a solid, liquid or a gas. Energy changes the arrangement of the particles and we get a solid, liquid or a gas.

The Kinetic Theory of Matter HEAT Solid Liquid Gas COOL In solid the particles are closely packed and not moving. In a liquid the particles are ………… ………. and ……….. …………… In a gas the particles are …………. …………… and ……….. ……………. Peacehaven Community School Science Faculty, November 2002

The Kinetic Theory of Matter HEAT melting boiling SOLID LIQUID GAS COOL condensing freezing REMEMBER: Changes of state are PHYSICAL CHANGES. The particles remain the same, it is their spacing and movement that changes.

Solid, Liquid or Gas? Gas Solid Liquid HEAT COOL Materials can change from one state of matter to another: HEAT Liquid Solid Gas melting boiling condensing freezing COOL

Definitions Match the word to the definition. melting evaporation condensation solidification sublimation a solid changing into the liquid a gas changing into a liquid a liquid changing into a gas a solid turning into a gas, not going through the liquid state a liquid changing into a solid, also known as freezing

Examples Match the word to the example. melting evaporation condensation solidification sublimation steam coming out of a boiling kettle formation of water on the windows in the mornings frost naphthalene toilets disappearing ice caps