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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Test your knowledge of mixtures in this KS3 Science quiz. Alloys are mixtures of metals. Alloying one metal with other metal(s) or non-metal(s) often enhances (improves) its properties. For example, steel is more malleable than iron, its primary element. There are many types of steel, one of the most common is mild steel which is an alloy of iron with a small quantity of the non-metal carbon. Another important group of alloys is the stainless steels, which resist corrosion (don't go rusty). These are mainly iron that has been alloyed with the metals chromium and nickel, together with small quantities of other metals and non metals. Many foods are emulsions. An emulsion is a mixture of an oil and water. Adding an emulsifier can make these very stable.

A property of many mixtures is that they can be easily separated into their component parts. One example that is usually done in school is to separate sulfur and iron filings. This is very simple as you can just use a magnet. A mixture of a solid dissolved into a liquid e.g. brine (salty water) can be separated using evaporation whilst mixtures of liquids with different boiling points can be separated using distillation.

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
The name given to the liquid which dissolves the solid in a solution is .......
The solid that has been dissolved is called the solute
Alloys are mixtures of metals. Which is NOT an alloy?
Chromium is an element
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
Which of the following is NOT a mixture?
Coca cola
Crude oil
Methane is a compound
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
A pure substance has a melting point which is always .......
Higher than its freezing point
Higher than its boiling point
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
Which of these substances is a mixture?
Sea water
Water and salt are compounds, oxygen is an element
How would you separate a mixture of iron filings and sulfur?
Use a magnet
Use a sieve
Use tweezers
Sulfur is non-magnetic
The method used to separate coloured dyes in ink is .......
Chroma comes from the Greek word for colour, khroma
You can find more about this topic by visiting BBC Bitesize - Elements, compounds and mixtures

Author:  Sue Davison

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