Give two examples of a liquid.
Any liquids.
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.
What causes melting?
Heat.
What are the three states of matter?
solid, liquid, 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.
What is the change from solid to liquid called?
Melting.
What do we call water when it is a gas?
Water vapour.
What do we call the temperature at which a substance boils?
Boiling point.
What is boiling?
It is when liquid is heated and it changes into a gas.
What do we call water when it is a solid?
Ice.
Identify the solid, liquid, and gas in the picture.
Solid: table, glass, ice. Liquid: cola. Gas: bubbles in cola.
Give two examples of a solid.
Any solid item.
Describe the phase change of an ice cube put into a hot pan.
Solid + heat = liquid and then liquid + more heat = gas.
What is freezing?
When a liquid cools and it changes into a solid.
What do we use to measure temperature?
A thermometer.
What do we call the temperature at which a substance melts?
Melting point.
Give an example of a gas.
Any gas.
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 melting?
When a solid is heated and it changes into a liquid.