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Science: Middle School: Grades 6, 7 and 8 Quiz - Changing Materials (Questions)

This Science quiz is called 'Changing Materials' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.

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This quiz takes a look at some reversible and some irreversible changes. Reversible changes to a material can be changed back but irreversible changes are more permanent

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Changing materials is also transforming substances. Think about water - when it is really cold it changes into ice, or when it is heated it changes into steam. Other substances can also be changed. One of the most fascinating aspects of science is the way that materials can be altered. Different substances react together in interesting ways, sometimes changing into new materials. Applying heat, cooling or adding water - all of these can change materials.

Test your knowledge of reversible and irreversible changes by trying this science quiz.

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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

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

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

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

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

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

Which of the following is an example of a reversible change?

[ ]	Evaporation but not condensation
[ ]	Condensation but not evaporation
[ ]	Combustion
[ ]	Evaporation and condensation

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

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 color
[ ]	A sudden change in temperature
[ ]	Vigorous bubbling
[ ]	All of the above

Science: Middle School: Grades 6, 7 and 8 Quiz - Changing Materials (Answers)

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)

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

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

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

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

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

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

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

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 color
[ ]	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