Solids, Liquids and Gases 01
When a liquid cools enough to become solid, it has frozen.

Solids, Liquids and Gases 01

Understanding matter is an important part of science. This is the first of two KS2 Science quizzes on the three states of matter - solids, liquids and gases - and it focusses on how they behave differently.

Everything is made up of matter. Matter can be in these different states: solid, liquid or gas. If you look around, you can see all sorts of objects. These are solids. Ice is solid water. You might have a drink - hopefully not near your computer! Drinks are liquids. Air is the invisible matter surrounding you. Air is a mixture of gases - oxygen and carbon dioxide for example. Steam, or water vapour, is water in the form of a gas.

Have you studied the states of matter in your science lessons at school? See how much you know about them and how they behave and by trying this Solids, Liquids and Gases quiz.

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  1. Which has the most densely-packed particles?
    The particles of a solid are held together by strong forces of attraction
  2. Which of these is not true of liquids?
    The shape of a liquid changes to fit its container
  3. When a liquid cools enough it becomes a solid. What do we call this process?
    When water (a liquid) is cold enough it freezes and turns into ice (a solid)
  4. When you fill a jug with sugar, it appears to have the same shape as the jug. You can also tip sugar from one container to another. Is sugar a solid, a liquid or a gas?
    You can see the tiny solid crystals when you look closely at sugar
  5. Which of these is not true of gases?
    Gases always take the same shape and volume as their containers. If not held in a sealed container, a gas will keep spreading
  6. What is the freezing point of water?
    The Celsius temperature scale is based on the freezing and boiling points of water - 0o C is the freezing point and 100o C is the boiling point
  7. When a solid is heated, it changes into a liquid. What do we call this process?
    Ice is a solid. If you heat it, it melts and becomes a liquid (water)
  8. Which of these is not true of solids?
    Solids stay the same shape and size, whatever container they are in
  9. What is the boiling point of water?
    Water boils at 100o C if you live close to sea-level. If you lived at the top of a 3,048 metre mountain, your water would boil at 90o C!
  10. Which of these has the least densely-packed particles?
    Gases have low density, with particles moving randomly and at high speed

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