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

Mixtures

KS2 Science lessons give pupils a chance to make interesting mixtures of various substances - and to take on the challenge of separating them! All of this is done in experiments which investigate solvents, solutes and suspensions. This quiz is all about mixtures and how to go about separating them.

Mixtures involve putting two or more substances together. Nursery children seem to love nothing as much as they love mixing. Mixing flour with raisins, sand with water, or pasta with rice: you will always find little children mixing different materials. Separating, on the other hand, doesn't seem to be as much fun - especially when all the different bricks have been mixed together! But young children don't have all the fun - mixing substances and then trying to separate them can be an enjoyable challenge for you as well - and even for adults.

See what you've learned in your science lessons by trying this quiz.

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  1. If you evaporated sea water, leaving the salt behind, how could you collect the water?
    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
  2. How could a mixture of salt and sand be separated?
    Salt can be dissolved but sand can't
  3. Which of the following would dissolve in water?
    We dissolve soap in water every time we have a bath
  4. Which one of the following is not a solution?
    A solution is a when two materials are thoroughly combined by dissolving - scientists call solutions 'homogeneous' mixtures
  5. Which of the following is an example of a mixture?
    A mixture is anything that is made up of two or more materials - most things are mixtures
  6. 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?
    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
  7. What method would be used to separate a solution of sugar and water?
    Evaporating the water would leave the sugar behind
  8. 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 would dissolve in the water, but it would not help to filter out the other materials
  9. What might you use to separate a mixture of sand and iron filings?
    Iron filings are too small to be caught in a sieve and sand particles are too large to pass through a filter
  10. What do we call a material that will not dissolve in water or another liquid?
    Insoluble is the opposite of soluble, and impermeable is the opposite of permeable

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