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Matter in Action Worksheet

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Matter in Action Worksheet

A picnic cooler has tipped over at the beach. Help sort the changes to matter and explain what can—and cannot—be undone. Read the case file, then complete the challenges.

Case file: What happened?

The cooler tipped in the sun. An ice cube melted into water. Later, the water was put in a freezer and became ice again. A paper napkin was crumpled, but it could be flattened. A slice of bread was toasted until its colour, smell and texture changed. It could not be turned back into fresh bread. These examples show that matter can change in different ways. A reversible change can be undone to recover the original material. An irreversible change cannot easily be undone to recover it. Heating or cooling can cause a change of state, such as melting or freezing.

1.In the case file, name the change that turned solid ice into liquid water.
2.Why is melting the ice cube a reversible change?
  • The water can be cooled and frozen back into ice.
  • The ice disappears and becomes a new material.
  • The water cannot be collected.
3.Classify each change as reversible or irreversible: (a) crumpling the napkin, (b) toasting the bread, (c) freezing the melted water.
4.Name two clues in the case file that show the bread changed when it was toasted.
5.When a change is reversible, the original material can be recovered. Write true or false and give one example from the case file.
TrueFalse
6.When liquid water is cooled enough to become solid ice, it is .
7.Amira blows up a balloon, then lets the air out. Is this usually a reversible or irreversible change? Explain what happens to the balloon and the air.
8.A puddle of water dries in the sun. The water has changed into water vapour and mixed with the air. Is this change reversible in principle? Explain how the water could be recovered.
9.Why is toasting bread not just a change of shape, like crumpling a napkin? Use evidence from the case file.
10.You want to test whether a small piece of chocolate melts and can be made solid again. Describe a safe method and state what observation would support your prediction.

2 printable pages

  • Matter in Action Worksheet, page 1 of 2: Case file: What happened?

    Page 1

  • Matter in Action Worksheet, page 2 of 2: 6. When liquid water is cooled enough to become solid ice, it is .

    Page 2

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