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Mixtures 01
Seawater is a mixture. It is water, salt and other substances mixed together.

Mixtures 01

Test yourself on alloys and their uses. What is an emulsion? What is an emulsifier?

Quizzes are a great way to learn if you are aged between 11 and 14.

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1.
How would you separate a mixture of iron filings and sulfur?
Filter
Use a magnet
Use a sieve
Use tweezers
Sulfur is non-magnetic
2.
A pure substance has a melting point which is always .......
Higher than its freezing point
Higher than its boiling point
Different
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
3.
Alloys are mixtures of metals. Which is NOT an alloy?
Brass
Bronze
Chromium
Solder
Chromium is an element
4.
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
The air is mainly nitrogen
5.
Which of these substances is a mixture?
Oxygen
Salt
Sea water
Water
Water and salt are compounds, oxygen is an element
6.
The method used to separate coloured dyes in ink is .......
Chromatography
Distillation
Evaporation
Filtration
Chroma comes from the Greek word for colour, khroma
7.
Which of the following is NOT a mixture?
Coca cola
Crude oil
Methane
Milk
Methane is a compound
8.
The name given to the liquid which dissolves the solid in a solution is .......
Distillate
Saturated
Soluble
Solvent
The solid that has been dissolved is called the solute
9.
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
If substances are chemically joined together they are much more difficult to separate. Alloys are mixtures that are usually hard to separate
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
There is more energy at higher temperatures
You can find more about this topic by visiting BBC Bitesize - Elements, compounds and mixtures

Author:  Sue Davison

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