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Science Quiz - Materials - Changing Things (Questions)

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.

If you stretch a spring - not too much - the spring gets longer. If you then let go of the spring, what happens?

[ ]	The spring gets even longer
[ ]	The spring straightens out
[ ]	The spring gets shorter again
[ ]	The spring loses its shape

2.

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

3.

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

4.

Which one of these will go back to how it was?

[ ]	A broken egg
[ ]	A mashed potato
[ ]	A stretched rubber band
[ ]	A squashed banana

5.

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

6.

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

7.

Lucy and her dad are making a pizza. What must they do before the pizza is ready to eat?

[ ]	Put it in the freezer
[ ]	Put it in the dishwasher
[ ]	Bake it in the oven
[ ]	Bake it in the fridge

8.

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

9.

The candle is made of wax. The candle is:

[ ]	Freezing
[ ]	Boiling
[ ]	Burning
[ ]	Getting bigger

10.

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 _____.

[ ]	Solid
[ ]	Gas
[ ]	Liquid
[ ]	Fluid

You can find more about this topic by visiting BBC Bitesize - Changing shape of materials

Science Quiz - Materials - Changing Things (Answers)

1.

If you stretch a spring - not too much - the spring gets longer. If you then let go of the spring, what happens?

[ ]	The spring gets even longer
[ ]	The spring straightens out
[x]	The spring gets shorter again
[ ]	The spring loses its shape

The spring can go back to its original shape and size

2.

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?

[x]	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

3.

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
[x]	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

4.

Which one of these will go back to how it was?

[ ]	A broken egg
[ ]	A mashed potato
[x]	A stretched rubber band
[ ]	A squashed banana

The rubber band can go back to how it was. The other changes are permanent

5.

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?

[x]	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

6.

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
[x]	Tea and milk
[ ]	Milk and sugar

Do you like drinking tea or coffee?

7.

Lucy and her dad are making a pizza. What must they do before the pizza is ready to eat?

[ ]	Put it in the freezer
[ ]	Put it in the dishwasher
[x]	Bake it in the oven
[ ]	Bake it in the fridge

Do you like pizza? What is your favourite pizza topping?

8.

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
[x]	Mix the flour, butter and eggs together
[ ]	Only use the flour
[ ]	Only use the eggs

Have you ever baked a cake?

9.

The candle is made of wax. The candle is:

[ ]	Freezing
[ ]	Boiling
[x]	Burning
[ ]	Getting bigger

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

10.

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 _____.

[x]	Solid
[ ]	Gas
[ ]	Liquid
[ ]	Fluid

Do you have candles on your birthday cake?