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Science: Middle School: Grades 6, 7 and 8 Quiz - Mixtures 2 (Questions)

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Alloys are mixtures of metals. Alloying one metal with other metal(s) or non-metal(s) often enhances its properties. For example, steel is stronger than iron, its primary element.

How much do you know about mixtures? Have a go at all our Science quizzes on the subject.

Which of these substances is a mixture?

[ ]	Oxygen
[ ]	Salt
[ ]	Sea water
[ ]	Water

The best description of a mixture is .......

[ ]	A lot of substances jumbled together
[ ]	One substance on its own
[ ]	Two or more substances added together which can be easily separated
[ ]	Two or more substances chemically joined together

Air is a mixture of different gasses. Which list consists of gasses present in the air?

[ ]	Hydrogen, oxygen, carbon dioxide
[ ]	Nitrogen, hydrogen, carbon dioxide
[ ]	Nitrogen, oxygen, carbon dioxide
[ ]	Nitrogen, oxygen, hydrogen

How would you separate a mixture of iron filings and sulfur?

[ ]	Filter
[ ]	Use a magnet
[ ]	Use a sieve
[ ]	Use tweezers

Alloys are mixtures of metals. Which is NOT an alloy?

[ ]	Brass
[ ]	Bronze
[ ]	Chromium
[ ]	Solder

A pure substance has a melting point which is .......

[ ]	Higher than its freezing point
[ ]	Lower than its boiling point
[ ]	The same as its boiling point
[ ]	The same as its freezing point

Which of the following is NOT a mixture?

[ ]	Coca cola
[ ]	Crude oil
[ ]	Methane
[ ]	Milk

The name given to the liquid which dissolves the solid in a solution is .......

[ ]	Distillate
[ ]	Saturated
[ ]	Soluble
[ ]	Solvent

The method used to separate colored dyes in ink is .......

[ ]	Chromatography
[ ]	Distillation
[ ]	Evaporation
[ ]	Filtration

10.

In a solution, the hotter the solvent .......

[ ]	No more of the soluble solid dissolves
[ ]	The less the solute dissolves
[ ]	The quicker the soluble solid dissolves
[ ]	The slower the solute dissolves

Science: Middle School: Grades 6, 7 and 8 Quiz - Mixtures 2 (Answers)