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If a pane of glass is broken it won't put itself back together again. The change is permanent!

Materials - Changing Things

Discover how heating, cooling, bending and mixing can change materials, and which changes can be undone or are permanent.

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Fascinating Fact:

Some changes are not reversible, like bread burning or eggs cooking; they cannot go back to how they were.

In KS1 Science, children explore how materials change when they are heated, cooled, stretched, squashed or mixed. They find out which changes are reversible and which are permanent.

Key Terms

Reversible change: A change that can be undone, like ice melting and then freezing back into ice.
Irreversible change: A change that cannot go back, such as a cake baking or paper burning.
Heating: Making something hotter, which can cause materials to melt, cook or change in other ways.

Frequently Asked Questions (Click to see answers)

What is an irreversible change for KS1?

An irreversible change is one that cannot be undone. For KS1, examples include bread to toast or cake mixture turning into a baked cake.

What is a reversible change in materials for children?

A reversible change is when a material can go back to how it was, like chocolate melting and then hardening again when cooled.

Why do we learn about changing materials in KS1 science?

Learning about changing materials helps children notice what heating and cooling do, make predictions, and understand real-life changes like cooking and freezing food.

Try These Related Quizzes

1 .

Carla is making ice cubes in the freezer. She pours water into the trays. She puts the trays into the freezer. The water freezes into ice.

Later, Carla takes the ice cubes out of the freezer. She leaves them in a warm room. What happens to the ice cubes?

The ice cubes melt back to water

The ice cubes stay frozen

The ice cubes turn into snow

The ice cubes get much bigger

Water can freeze, and then it can melt again

2 .

The candle is made of wax. The candle is:

Freezing

Boiling

Burning

Getting bigger

As the candle burns, there is less and less candle wax

3 .

Danny and Alex are making a cake. The ingredients are flour, butter and eggs. What must they do with the ingredients?

Put the flour in the oven and fry the eggs

Mix the flour, butter and eggs together

Only use the flour

Only use the eggs

Have you ever baked a cake?

4 .

Li cuts a piece of card in two. When she lets go of the two pieces of card, what happens?

The two pieces of card go back together again

The two pieces of card stay separate

The two pieces of card get much bigger

The two pieces of card disappear

Li can stick the pieces back together, but they don’t go back like a spring or a rubber band

5 .

Karen is making a cup of tea. She pours milk into the tea and stirs it. The milky tea is a mixture. What is mixed together?

Milk and coffee

Tea and coffee

Tea and milk

Milk and sugar

Do you like drinking tea or coffee?

6 .

Joe is blowing up a red balloon. The balloon is getting very big. Joe does not tie the balloon. He lets go of the balloon. It shoots off and all the air comes out. What happens to the size of the balloon?

The balloon goes back to its original size

The balloon gets even bigger

The balloon stays really big

The balloon disappears

Balloons are like springs and rubber bands. They can go back to their original size

7 .

This candle has been burning for a long time. Some of the wax has melted and run down the sides of the candle. Then the wax has cooled and turned back into a _____.