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Science Quiz - Changing Materials (Questions)

Discover the wonders of KS2 Science with this quiz on Changing Materials! It's all about changes that can be undone (reversible) and changes that stay forever (irreversible).

Changing materials means turning things into something else. Like water – it can become ice when it's super cold or turn into steam when it's heated. Science is amazing because materials can transform! Different things mix together, making new stuff. Heating, cooling, or adding water – all these can change materials in cool ways.

Test what you know about reversible and irreversible changes with this awesome science quiz!

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1. What is a reversible change?
[ ] A material changes permanently into a new material
[ ] A material changes its feel or appearance, but it is still the same material
[ ] A material changes into a new material, but it can be changed back
[ ] A material stops existing
2. What is an irreversible change?
[ ] A material changes permanently into a new material
[ ] A material changes its feel or appearance, but it is still the same material
[ ] A material changes into a new material, but it can be changed back
[ ] A material stops existing
3. Which of the following is not an example of a reversible change?
[ ] A puddle turns to ice on a very cold winter's day
[ ] Sugar is dissolved in hot water
[ ] An egg is fried in a hot pan
[ ] A bar of chocolate has been left in the sunshine and has melted
4. Which of the following is not an example of an irreversible change?
[ ] A log of wood has been burned on the fire
[ ] A fruit smoothie has been frozen to make lollies
[ ] A mixture of flour, water and yeast has been baked into bread
[ ] A bicycle left out in the rain begins to rust
5. Burning will produce what sort of change?
[ ] An irreversible change
[ ] A reversible change
[ ] Either a reversible or an irreversible change
[ ] Neither a reversible or irreversible change
6. Heating will produce what sort of change?
[ ] An irreversible change
[ ] A reversible change
[ ] Either a reversible or irreversible change
[ ] Neither a reversible or irreversible change
7. Which of the following is an example of a reversible change?
[ ] Evaporation but not condensation
[ ] Condensation but not evaporation
[ ] Combustion
[ ] Evaporation and condensation
8. If you were burning a candle, which of the following would be a reversible change?
[ ] The solid candle wax melts
[ ] The liquid wax in the wick burns
[ ] The flame produces smoke
[ ] All of the above
9. Which of these mixtures is not an irreversible change?
[ ] PVA glue mixed with Borax
[ ] Mixing salt and water
[ ] Plaster of Paris mixed with water
[ ] Bicarbonate of soda mixed with vinegar
10. Which of the following is a sign of an irreversible change taking place?
[ ] A change in colour
[ ] A sudden change in temperature
[ ] Vigorous bubbling
[ ] All of the above

You can find more about this topic by visiting BBC Bitesize - Chemical reactions and reversible changes

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Science Quiz - Changing Materials (Answers)
1. What is a reversible change?
[ ] A material changes permanently into a new material
[x] A material changes its feel or appearance, but it is still the same material
[ ] A material changes into a new material, but it can be changed back
[ ] A material stops existing
A material changes its feel or appearance, but it's still the same material and the change can be reversed (that is, changed back)
2. What is an irreversible change?
[x] A material changes permanently into a new material
[ ] A material changes its feel or appearance, but it is still the same material
[ ] A material changes into a new material, but it can be changed back
[ ] A material stops existing
An irreversible change is also called a 'chemical' change
3. Which of the following is not an example of a reversible change?
[ ] A puddle turns to ice on a very cold winter's day
[ ] Sugar is dissolved in hot water
[x] An egg is fried in a hot pan
[ ] A bar of chocolate has been left in the sunshine and has melted
Melting, freezing and dissolving are all examples of reversible changes. Cooking causes an irreversible change
4. Which of the following is not an example of an irreversible change?
[ ] A log of wood has been burned on the fire
[x] A fruit smoothie has been frozen to make lollies
[ ] A mixture of flour, water and yeast has been baked into bread
[ ] A bicycle left out in the rain begins to rust
Things that have been frozen can be thawed or melted
5. Burning will produce what sort of change?
[x] An irreversible change
[ ] A reversible change
[ ] Either a reversible or an irreversible change
[ ] Neither a reversible or irreversible change
Something which has been burnt can never be changed back
6. Heating will produce what sort of change?
[ ] An irreversible change
[ ] A reversible change
[x] Either a reversible or irreversible change
[ ] Neither a reversible or irreversible change
Gentle heating can melt a substance - this would be a reversible change. Heating can also cook something, which would be an irreversible change
7. Which of the following is an example of a reversible change?
[ ] Evaporation but not condensation
[ ] Condensation but not evaporation
[ ] Combustion
[x] Evaporation and condensation
These reversible changes are a vital part of the water cycle
8. If you were burning a candle, which of the following would be a reversible change?
[x] The solid candle wax melts
[ ] The liquid wax in the wick burns
[ ] The flame produces smoke
[ ] All of the above
After the candle is blown out, the liquid wax cools and becomes solid again
9. Which of these mixtures is not an irreversible change?
[ ] PVA glue mixed with Borax
[x] Mixing salt and water
[ ] Plaster of Paris mixed with water
[ ] Bicarbonate of soda mixed with vinegar
Mixing PVA glue with Borax can create some exciting new materials, like slime! (Remember that Borax and Plaster of Paris should only be used when you are working with an adult)
10. Which of the following is a sign of an irreversible change taking place?
[ ] A change in colour
[ ] A sudden change in temperature
[ ] Vigorous bubbling
[x] All of the above
If you see all of these you can be sure than an irreversible change is taking place
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