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Mixtures

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The purpose of the paper of a tea bag is to filter the mixture of tea leaves and water.

Mixtures

Mixtures are everywhere, from air to alloys. KS2 Science teaches how substances combine, separate, and form new materials with useful properties.

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Fascinating Fact:

Alloys, like steel and bronze, are mixtures of metals that make stronger materials.

In KS2 Science, pupils learn that mixtures are made when two or more substances are combined without forming a new chemical substance. They explore separating methods like sieving, filtering, and evaporation.

  • Mixture: A combination of two or more substances that are not chemically joined.
  • Alloy: A mixture of metals that creates stronger or more useful materials.
  • Filtration: A process used to separate solid particles from a liquid.
What is a mixture in KS2 Science?

A mixture is when two or more substances are combined without making a new substance, like sand and water or salt and pepper.

How are mixtures different from compounds?

Mixtures keep the properties of their substances and can be separated, but compounds are chemically bonded and need chemical reactions to split.

What are examples of mixtures in everyday life?

Examples include air (a mix of gases), sea water (water and salts), and breakfast cereal with milk.

1 .
What might you use to separate a mixture of sand and iron filings?
A filter
A sieve
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
2 .
What do we call a material that will not dissolve in water or another liquid?
Impermeable
Permeable
Insoluble
Soluble
Insoluble is the opposite of soluble, and impermeable is the opposite of permeable
3 .
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
Allowing the steam from the evaporating water to collect on a cold surface would make the water vapour condense. The liquid could then be collected in a separate container
4 .
Which of the following would dissolve in water?
Oil
Soap
Clay
Chalk
We dissolve soap in water every time we have a bath
5 .
Which one of the following is not a solution?
Coffee
Sweet tea
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
6 .
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
Evaporating the water would leave the sugar behind
7 .
Which of the following is an example of a mixture?
Cake batter
Air
Sedimentary rocks
All of the above
A mixture is anything that is made up of two or more materials - most things are mixtures
8 .
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
Salt can be dissolved but sand can't
9 .
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
Bicarbonate of soda would dissolve in the water, but it would not help to filter out the other materials
10 .
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 flavour inside the tea bag
To keep the tea leaves from burning
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 can find more about this topic by visiting BBC Bitesize - What is separation?

Author:  Sheri Smith (PhD English Literature, English Teacher & Quiz Writer)

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