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Physical and Chemical Changes

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Physical and Chemical Changes

Read each situation carefully. A physical change alters a substance’s form, size or state without making a new substance. A chemical change makes one or more new substances. Use evidence from the situations to support your answers.

Spot the change

Use the investigation notes below and the examples named in the questions.

What Freya did

What she noticed

Left an ice cube on a plate

It became a puddle of water

Mixed lemon juice and bicarbonate of soda

Bubbles formed and the mixture fizzed

Bent a clean copper wire

The wire changed shape but stayed a wire

1.Which pair contains two physical changes? Choose one.
  • Ice melting and paper being cut
  • Bread toasting and the fizzy mixture
  • Ice melting and bread toasting
  • Paper being cut and the fizzy mixture
2.True or false? When ice melts, it becomes a different substance from water.
TrueFalse
3.Complete the sentence: Bending the copper wire is a physical change because the wire changes its , but no new substance is made.
4.Which observation from Freya’s investigation is the strongest clue that a chemical change may have happened?
  • The ice became liquid
  • The wire bent
  • Bubbles formed when the liquids were mixed
  • The ice sat on a plate
5.Sort these changes by type: tearing a piece of paper; frying an egg; freezing water; rust forming on an iron nail.
  • Tearing paper
  • Frying an egg
  • Freezing water
  • Rust forming on an iron nail
  • Chemical change
  • Chemical change
  • Physical change
  • Physical change

Explain the evidence

Think about what changes and what stays the same.

6.When bread is toasted, it turns brown and cannot be changed back into fresh bread. Is toasting bread a physical or chemical change? Give one reason.
7.A student says, “Anything that bubbles must be a chemical change.” Is this always a reliable rule? Explain why or why not.
8.A candle’s wax melts near the flame, and the wick burns. Identify one physical change and one chemical change in this situation.
9.Explain the difference between a physical change and a chemical change. Include one example of each from this worksheet.
10.Imagine you are testing an unknown change. Describe two clues you could look for to help decide whether a chemical change has occurred.

3 printable pages

  • Physical and Chemical Changes, page 1 of 3: Spot the change

    Page 1

  • Physical and Chemical Changes, page 2 of 3: Explain the evidence

    Page 2

  • Physical and Chemical Changes, page 3 of 3: 9. Explain the difference between a physical change and a chemical change. Include one…

    Page 3

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