# Changing Materials

In this worksheet, students will consider what happens when materials are changed by varying the temperature and the effects upon the material itself.

Key stage:  KS 2

Curriculum topic:   States of Matter

Curriculum subtopic:   Heating and Cooling

Difficulty level:

### QUESTION 1 of 10

Many of the different materials you use day in, day out, can be changed by a change in the temperature. What will happen to them? Sometimes they melt, sometimes they boil, sometimes they turn solid, sometimes they catch fire.

When water turns into ice what is it doing?

melting

freezing

boiling

To make an ice lolly from water and fruit juice what do you have to do?

melt it

freeze it

heat it

If a bar of chocolate is left in a hot car what will happen to it?

it will boil

it will melt

it will cool

If water is heated until it boils, something can be seen coming off the surface of the water.

What do you think it is?

smoke

fog

steam

When steam touches a cold surface, like a window or a mirror, what happens to it?

it turns into smoke

it turns into water

it turns into ice

If the butter becomes a bit too soft, what can you do to make it hard again?

warm it in a pan

cool it in the fridge

leave it on a table

Predict what you expect to happen to some cooking oil that has been put into the fridge.

it will freeze

it will melt

it will stay the same

• Question 1

When water turns into ice what is it doing?

freezing
EDDIE SAYS
Look carefully - water is turning into ice. That means that it is cooling down. How do you turn water into ice? Put it into the freezer. That will FREEZE it!
• Question 2

To make an ice lolly from water and fruit juice what do you have to do?

freeze it
EDDIE SAYS
You're turning the water and fruit juice into ice - that means you're going to have to cool it by putting it into the freezer. Then the liquid mixture will freeze into a solid ice lolly.
• Question 3

If a bar of chocolate is left in a hot car what will happen to it?

it will melt
EDDIE SAYS
Chocolate doesn't need much heat to make it melt - the hot car will certainly do it! When you get home, don't unwrap it - just put it in the fridge for an hour and it'll be just nice to eat because it will cool down and turn back to solid chocolate.
• Question 4

If water is heated until it boils, something can be seen coming off the surface of the water.

What do you think it is?

steam
EDDIE SAYS
Steam is what you get when water is heated until it boils. Steam is water gas with tiny drops of water mixed in. It is very hot indeed and can cause very nasty burns.
• Question 5

When steam touches a cold surface, like a window or a mirror, what happens to it?

it turns into water
EDDIE SAYS
When the steam touches the cold surface it loses a lot of its heat. That means it stops being steam and cools down into drops of water. It is called condensation, which is why you see water on the mirror in the bathroom.
• Question 6

If the butter becomes a bit too soft, what can you do to make it hard again?

cool it in the fridge
EDDIE SAYS
The butter is soft because it is too warm. Put it into the fridge and it'll become cold and hard again. In fact some people carve big blocks of butter to make figures like Bart Simpson! They have to keep them cold to stop them melting.
• Question 7

Predict what you expect to happen to some cooking oil that has been put into the fridge.

it will stay the same
EDDIE SAYS
Cooking oil is not really changed by cooling it down, unlike things like butter. So putting it in the fridge won't change it, like freezing it for example. Melting means 'change from solid to liquid' and cooking oil is liquid already.
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