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Physical Changes in Matter

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Physical Changes in Matter

Help plan a chilly-day science stall by investigating what happens to familiar materials. For each change, decide whether the material stays the same substance or a new substance forms. Use evidence to explain your thinking.

At the chilly-day stall

Mila is preparing frozen fruit sticks. She pours fruit juice into moulds and puts them in a freezer. Later, the frozen sticks warm up and begin to melt.

1.The juice freezes in the moulds. Which description best explains this change?
  • A liquid changes into a solid, but remains the same material.
  • A liquid changes into a gas and disappears.
  • A new substance forms because the juice gets colder.
  • The juice changes into a different kind of liquid.
2.When a frozen fruit stick melts, name its starting state and its new state. Explain why melting is a physical change.
3.Mila pours a little water into an ice-cube tray and leaves it in the freezer. What change should she expect, and how could she reverse it?

What happens to the water?

A pot of water is heated. Bubbles form and water vapour rises. Later, the vapour touches a cool lid and tiny drops appear.

4.Complete the changes: heating liquid water to form water vapour is called . Cooling water vapour until it forms liquid drops is called .
5.A drop forms on the cool lid. Is this a physical or chemical change? Give one piece of evidence.

Sort the stall experiments

For each event, decide whether it is a physical change or a chemical change.

6.Match each event to the type of change.
  • A. Cutting an apple into slices
  • B. Toasting bread until it browns
  • C. Sugar dissolving in a cup of water
  • D. A candle wick burning
  • 2. Chemical change
  • 2. Chemical change
  • 1. Physical change
  • 1. Physical change
7.A piece of paper is torn into small pieces. Is this a physical or chemical change? Explain why the paper is still paper.
8.Finn says, “Every physical change can easily be reversed.” Is Finn correct? Use tearing paper or dissolving sugar to support your answer.
9.The stall team wants to separate sugar from sugar water without changing the sugar into a new substance. Describe a method and explain what physical change happens.

3 printable pages

  • Physical Changes in Matter, page 1 of 3: At the chilly-day stall

    Page 1

  • Physical Changes in Matter, page 2 of 3: What happens to the water?, Sort the stall experiments

    Page 2

  • Physical Changes in Matter, page 3 of 3: 8. Finn says, “Every physical change can easily be reversed.” Is Finn correct? Use…

    Page 3

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