Heating Materials 1 Worksheet

You use lots of materials every day. What happens when some of them are heated? Do they change? How? What's left?

In this worksheet, there are several materials for you to think about; for example, what happens when you heat a piece of bread? You get toast - yum!

Let's find out....

Clay on a potting wheel

What happens when CLAY is heated?

it melts

it stays the same

it becomes hard

Water

What happens when WATER is heated?

it melts

it stays the same

it boils

Chocolate

What happens when CHOCOLATE is heated?

it melts

it stays the same

it freezes

Potato

What happens when A POTATO is heated?

it melts

it stays the same

it goes soft

Candle

What happens when A CANDLE is heated?

it melts

it stays the same

it boils

Sponge mixture

What happens when A SPONGE-CAKE MIXTURE is heated?

it melts

it stays the same

it rises

Mug of tea

What happens when A MUG is heated?

it melts

it stays the same

it catches fire

Here is an egg before it's been cooked:

Raw egg

Here's the egg after it's been cooked:

Boiled egg

What do you think will happen to the egg when it cools down after cooking?

it goes back to being runny

it stays the same as when it was cooked

it turns brown and smells

ANSWERS

Question 1

Clay on a potting wheel

What happens when CLAY is heated?

CORRECT ANSWER

it becomes hard

EDDIE SAYS

Clay is what china and pottery is made from, so when it is heated (called "firing") it becomes hard. Pots are made on a wheel and put in a special oven called a kiln which heats them up and hardens them.

ANSWERS

Question 2

Water

What happens when WATER is heated?

CORRECT ANSWER

it boils

EDDIE SAYS

Put water in a saucepan on a hob and watch - or try the kettle, if it's see-through. As the water gets hot it produces bubbles from the bottom. More and more bubbles, hotter and hotter, till all the water's jumping around - that's boiling hot!

ANSWERS

Question 3

Chocolate

What happens when CHOCOLATE is heated?

CORRECT ANSWER

it melts

EDDIE SAYS

Take a square of chocolate (DON'T EAT IT!) and hold it in your hand. As it warms up what happens? It starts to go all runny - that's melting, because it's turning into a liquid. Now you can lick it off your hand!

ANSWERS

Question 4

Potato

What happens when A POTATO is heated?

CORRECT ANSWER

it goes soft

EDDIE SAYS

When potatoes are boiled in water, or heated in the oven, the heat changes them into a soft material. That makes potatoes nice to eat - they're hard to eat raw!

ANSWERS

Question 5

Candle

What happens when A CANDLE is heated?

CORRECT ANSWER

it melts

EDDIE SAYS

Candles are made of a material called wax. When wax is heated it starts to go runny - that means it is melting into a liquid. Next time you see a candle burning, look for the molten wax being made next to the flame.

ANSWERS

Question 6

Sponge mixture

What happens when A SPONGE-CAKE MIXTURE is heated?

CORRECT ANSWER

it rises

EDDIE SAYS

Sponge-cake mixture is made from ingredients like flour, butter and eggs. When the mixture is heated in the oven something amazing happens: it rises up and bakes into a lovely fluffy sponge (well, it does if you get it right!).

ANSWERS

Question 7

Mug of tea

What happens when A MUG is heated?

CORRECT ANSWER

it stays the same

EDDIE SAYS

A mug is what you put drinks into, both hot and cold. It's made from china which is pretty heatproof, so the mug shouldn't change - it's designed to get hot without breaking or changing.

ANSWERS

Question 8

Here is an egg before it's been cooked:

Raw egg

Here's the egg after it's been cooked:

Boiled egg

What do you think will happen to the egg when it cools down after cooking?

CORRECT ANSWER

it stays the same as when it was cooked

EDDIE SAYS

Raw egg is very runny but when it's heated it goes much harder. When the egg is cooked, if it's left to go cold, it just stays the same. After all, that's what hard-boiled eggs are - eggs that have been boiled and have cooled down.