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Physical vs Chemical Changes

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Physical vs Chemical Changes

Read each question carefully. Choose or write the best answer. For the classification question, use P for physical change and C for chemical change.

Understanding the Differences

A physical change alters a substance’s form, size or state without making a different substance. A chemical change forms one or more new substances with different properties. Some clues to a chemical change include bubbles from a reaction, an unexpected colour or smell change, or heat or light being produced. A clue alone does not always prove a chemical change.

1.Which example changes a substance’s state or shape without forming a new substance?

A copper statue developing a green coating
A pancake cooking in a frying pan
A puddle of water freezing overnight
A cut apple turning brown

2.Which statement best describes a chemical change?

The material changes size but remains the same substance.
The material changes state and can be changed back by cooling.
One or more new substances form with different properties.
The material is moved from one container to another.

3.Select all observations that can be evidence of a chemical change.

A gas forms during a reaction
A material is folded into a new shape
An unexpected colour change occurs
Heat or light is released
A new smell appears

Identifying Changes

Classify each example as a physical change (P) or a chemical change (C).

4.Classify shaping a lump of modelling clay by pressing it flat.

5.Classify a slice of bread becoming toast in a toaster.

6.Classify liquid water turning into water vapour as it warms.

7.Classify food being broken down by digestive juices in the body.

8.Classify a sheet of newspaper being torn into strips.

9.Classify a steel gate forming a reddish-brown layer after being left in the rain.

10.Explain why grated cheese is still a physical change even though the cheese looks different from a block.

11.A wooden skewer burns and becomes charcoal and gases. Explain why this is a chemical change.

Changes Around Us

Use what you know about whether new substances form to answer each question.

12.Give two examples of physical changes that could happen while preparing food at home.

13.Give two examples of chemical changes that could happen while preparing food at home.

14.A student adds lemon juice to a solution of baking soda. The mixture fizzes and the container becomes cooler. Is this likely to be a chemical change? Explain how the observations support your answer.

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3 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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