KS3 Y8 Changing State

Gap-fill exercise.


Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button if available to get a clue. Note that you will lose points if you ask for hints or clues!
   boil      boiling point      boils      condensation      cool      evaporation      freeze      freezing point      gases      given      heating      hotter and hotter      iqui      liquid      melting point      melts      olids      removing      solid      three   
There are states of matter. They are s, lds and . We can change a into a liquid by it until it . The temperature at which it melts is called the of the solid.

If we would continue to heat the liquid the liquid will get . Eventually it will start to . This is when liquids become . The temperature at which it is called the .

But a liquid does not need to be heated to the boiling point before it changes state to a gas. It can happen even at room temperature. This process is called .

We can also gases down. When gases are been cooled they change states and become . We call this . When the liquid is cooled down further it will eventually . This is when a liquid becomes a solid and the temperature is called the .

Changing from a solid substance to a liquid and from a liquid to a gas requires heat energy to be to the substance.

And changing states from gas to liquid and then to solids involve heat energy from the substance.