Changing Materials
Burning will produce an irreversible change.

Changing Materials

This KS2 Science quiz, Changing Materials, takes a look at some reversible and some irreversible changes. Reversible changes to a material can be changed back but irreversible changes are more permanent

Changing materials is also transforming substances. Think about water - when it is really cold it changes into ice, or when it is heated it changes into steam. Other substances can also be changed. One of the most fascinating aspects of science is the way that materials can be altered. Different substances react together in interesting ways, sometimes changing into new materials. Applying heat, cooling or adding water - all of these can change materials.

Test your knowledge of reversible and irreversible changes by trying this science quiz.

  1. Which of these mixtures is not an irreversible change?
    Mixing PVA glue with Borax can create some exciting new materials, like slime! (Remember that Borax and Plaster of Paris should only be used when you are working with an adult)
  2. Burning will produce what sort of change?
    Something which has been burnt can never be changed back
  3. Which of the following is not an example of a reversible change?
    Melting, freezing and dissolving are all examples of reversible changes. Cooking causes an irreversible change
  4. Which of the following is a sign of an irreversible change taking place?
    If you see all of these you can be sure than an irreversible change is taking place
  5. What is a reversible change?
    A material changes its feel or appearance, but it's still the same material and the change can be reversed (that is, changed back)
  6. What is an irreversible change?
    An irreversible change is also called a 'chemical' change
  7. Heating will produce what sort of change?
    Gentle heating can melt a substance - this would be a reversible change. Heating can also cook something, which would be an irreversible change
  8. Which of the following is an example of a reversible change?
    These reversible changes are a vital part of the water cycle
  9. If you were burning a candle, which of the following would be a reversible change?
    After the candle is blown out, the liquid wax cools and becomes solid again
  10. Which of the following is not an example of an irreversible change?
    Things that have been frozen can be thawed or melted

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