What are the three states of matter?
solid, liquid, gas.
Give two examples of a solid.
Any solid item.
Give two examples of a liquid.
Any liquids.
Give an example of a gas.
Any gas.
Describe the particle model of a solid.
Particles are tightly packed in fixed positions. This makes it difficult for a solid to change shape.
Describe the particle model of a liquid.
Particles are close together but can slide past each other and change places. This means liquids can change shape easily.
Describe the particle model of a gas.
Particles are spaced far apart. This means gas can have any shape. It can also be squashed easily.
What is the change from solid to liquid called?
Melting.
What causes melting?
Heat.
What is melting?
When a solid is heated and it changes into a liquid.
What is boiling?
It is when liquid is heated and it changes into a gas.
What is freezing?
When a liquid cools and it changes into a solid.
Describe the phase change of an ice cube put into a hot pan.
Solid + heat = liquid and then liquid + more heat = gas.
What do we call the temperature at which a substance melts?
Melting point.
What do we call the temperature at which a substance boils?
Boiling point.
What do we use to measure temperature?
A thermometer.
