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Science Quiz - Mixtures 01 (Questions)

Mixtures are combinations of substances. In KS3 Science, pupils explore how mixtures differ from pure substances and how they can be separated into their components.

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Fascinating Fact:

Alloys, like steel and bronze, are mixtures of metals that are stronger than the pure metals.

In KS3 Science, mixtures are studied to show how substances can be combined without forming new elements or compounds. Methods like filtration, distillation, and evaporation separate them effectively.

Key Terms

Mixture: A combination of substances that are not chemically joined together.
Alloy: A mixture of metals designed to have useful properties, such as strength.
Filtration: A method used to separate an insoluble solid from a liquid.

Frequently Asked Questions (Click to see answers)

What is the difference between a mixture and a compound?

A mixture contains substances that are not chemically bonded, while a compound forms when elements chemically bond to create a new substance.

How can mixtures be separated in KS3 Science?

Mixtures can be separated using physical methods like filtration, distillation, evaporation, and chromatography, depending on the substances involved.

Why are alloys important in everyday life?

Alloys are important because they combine metals to make stronger, more durable materials used in tools, buildings, vehicles, and electronics.

Try These Related Quizzes

1.

Which of these substances is a mixture?

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

2.

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 often be easily separated
[ ]	Two or more substances chemically joined together

3.

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

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

4.

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

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

5.

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

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

6.

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

[ ]	Higher than its freezing point
[ ]	Higher than its boiling point
[ ]	Different
[ ]	The same

7.

Which of the following is NOT a mixture?

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

8.

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

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

9.

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

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

10.

In a solution made by dissolving a solid in a liquid, 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

You can find more about this topic by visiting BBC Bitesize - Elements, compounds and mixtures

Science Quiz - Mixtures 01 (Answers)

1.

Which of these substances is a mixture?

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

Water and salt are compounds, oxygen is an element

2.

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

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

If substances are chemically joined together they are much more difficult to separate. Alloys are mixtures that are usually hard to separate

3.

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

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

The air is mainly nitrogen

4.

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

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

Sulfur is non-magnetic

5.

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

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

Chromium is an element

6.

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

[ ]	Higher than its freezing point
[ ]	Higher than its boiling point
[ ]	Different
[x]	The same

Any sample of a pure substance will have the same melting point as any other sample of the same substance. One sample of a mixture will often have a different melting point to other samples of the same mixture. If the two samples of a mixture have the same concentrations, then they will have very similar melting points

7.

Which of the following is NOT a mixture?

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

Methane is a compound

8.

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

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

The solid that has been dissolved is called the solute

9.

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

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

Chroma comes from the Greek word for colour, khroma

10.

In a solution made by dissolving a solid in a liquid, the hotter the solvent .......

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

There is more energy at higher temperatures