1. 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

2. 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.

3. 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

4. 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.

5. 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

6. 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

7. 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