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Science: Middle School: Grades 6, 7 and 8 Quiz - Mixtures 1 (Questions)

This Science quiz is called 'Mixtures 1' 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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Mixtures involve putting two or more substances together. Nursery children seem to love nothing as much as they love mixing. Mixing flour with raisins, sand with water, or pasta with rice: you will always find little children mixing different materials. Separating, on the other hand, doesn't seem to be as much fun - especially when all the different bricks have been mixed together! But young children don't have all the fun - mixing substances and then trying to separate them can be an enjoyable challenge for you as well - and even for adults.

See what you've learned in your science lessons by trying this quiz.

Which of the following is an example of a mixture?

[ ]	Cake batter
[ ]	Air
[ ]	Sedimentary rocks
[ ]	All of the above

Which one of the following is not a solution?

[ ]	Coffee
[ ]	Sweet tea
[ ]	A mixture of sand and water
[ ]	Carbonated water

What might you use to separate a mixture of sand and iron filings?

[ ]	A filter
[ ]	A sieve
[ ]	A magnet
[ ]	A spoon

How could a mixture of salt and sand be separated?

[ ]	By sieving only
[ ]	By adding water
[ ]	By filtering only
[ ]	By dissolving the salt in water and then filtering

Which of the following would dissolve in water?

[ ]	Oil
[ ]	Soap
[ ]	Clay
[ ]	Chalk

What method would be used to separate a solution of sugar and water?

[ ]	Boiling the water until it evaporated
[ ]	Sieving the solution
[ ]	Filtering the solution
[ ]	Using a magnet

A tea bag is made from tea leaves and an especially porous paper. Besides being a container for the tea leaves, what is the purpose of the paper?

[ ]	To keep the tea leaves dry
[ ]	To keep the tea flavor inside the tea bag
[ ]	To keep the tea leaves from burning
[ ]	To filter the mixture of tea leaves and water

You are trying to clean some muddy water by using a filter. Which of these materials would you not use in building a home made filter?

[ ]	Bicarbonate of soda
[ ]	Cotton wool
[ ]	Sand
[ ]	Filter paper

What do we call a material that will not dissolve in water or another liquid?

[ ]	Impermeable
[ ]	Permeable
[ ]	Insoluble
[ ]	Soluble

10.

If you evaporated sea water, leaving the salt behind, how could you collect the water?

[ ]	By filtering
[ ]	By condensation
[ ]	By dissolving
[ ]	It would be impossible

Science: Middle School: Grades 6, 7 and 8 Quiz - Mixtures 1 (Answers)

Which of the following is an example of a mixture?

[ ]	Cake batter
[ ]	Air
[ ]	Sedimentary rocks
[x]	All of the above

A mixture is anything that is made up of two or more materials - most things are mixtures

Which one of the following is not a solution?

[ ]	Coffee
[ ]	Sweet tea
[x]	A mixture of sand and water
[ ]	Carbonated water

A solution is a when two materials are thoroughly combined by dissolving - scientists call solutions 'homogeneous' mixtures

What might you use to separate a mixture of sand and iron filings?

[ ]	A filter
[ ]	A sieve
[x]	A magnet
[ ]	A spoon

Iron filings are too small to be caught in a sieve and sand particles are too large to pass through a filter

How could a mixture of salt and sand be separated?

[ ]	By sieving only
[ ]	By adding water
[ ]	By filtering only
[x]	By dissolving the salt in water and then filtering

Salt can be dissolved but sand can't

Which of the following would dissolve in water?

[ ]	Oil
[x]	Soap
[ ]	Clay
[ ]	Chalk

We dissolve soap in water every time we have a bath

What method would be used to separate a solution of sugar and water?

[x]	Boiling the water until it evaporated
[ ]	Sieving the solution
[ ]	Filtering the solution
[ ]	Using a magnet

Evaporating the water would leave the sugar behind

A tea bag is made from tea leaves and an especially porous paper. Besides being a container for the tea leaves, what is the purpose of the paper?

[ ]	To keep the tea leaves dry
[ ]	To keep the tea flavor inside the tea bag
[ ]	To keep the tea leaves from burning
[x]	To filter the mixture of tea leaves and water

The paper keeps the tea leaves inside the tea bag, but allows the tea solution to pass through. This makes a cup of tea with no tea leaves in it

You are trying to clean some muddy water by using a filter. Which of these materials would you not use in building a home made filter?

[x]	Bicarbonate of soda
[ ]	Cotton wool
[ ]	Sand
[ ]	Filter paper

Bicarbonate of soda would dissolve in the water, but it would not help to filter out the other materials

What do we call a material that will not dissolve in water or another liquid?

[ ]	Impermeable
[ ]	Permeable
[x]	Insoluble
[ ]	Soluble

Insoluble is the opposite of soluble, and impermeable is the opposite of permeable

10.

If you evaporated sea water, leaving the salt behind, how could you collect the water?

[ ]	By filtering
[x]	By condensation
[ ]	By dissolving
[ ]	It would be impossible

Allowing the steam from the evaporating water to collect on a cold surface would make the water vapor condense. The liquid could then be collected in a separate container