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Exploring Chemical Change
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Exploring Chemical Change
Explore how to recognise chemical changes and distinguish them from physical changes. Read each question carefully. For the matching activity, connect each example to its type of change.
Recognise the change
Choose or match the best answer for each example.
1.Which statement describes a chemical change most accurately?
- A material changes shape, but no new substance is made.
- One or more new substances form from the starting materials.
- A material changes temperature, so it must have become a new substance.
2.Select all the observations that can be clues that a chemical change has occurred. A clue on its own does not always prove that a new substance formed.
- A new colour appears.
- A solid melts into a liquid.
- Bubbles form as a gas is produced.
- A substance dissolves in water.
- Heat or light is released.
3.A steel bolt develops a flaky orange-brown coating after being left in damp air. What type of change is taking place?
- A physical change, because the bolt has only changed shape.
- A chemical change, because rust is a new substance.
- A physical change, because the coating can be brushed off.
4.Match each example to whether it is a physical change or a chemical change.
- A. A candle’s wax melts
- B. Toast becomes browned while heating
- C. Salt dissolves in water
- D. A log burns and produces ash
- E. A copper roof develops a green coating
- 2. Chemical change
- 2. Chemical change
- 1. Physical change
- 1. Physical change
- 2. Chemical change
Explain your thinking
Use observations and examples to support your answers.
5.In your own words, explain what happens to matter during a chemical change.
6.Compare melting ice with burning a piece of paper. State which is a physical change and which is a chemical change, and explain one difference between them.
7.At a volcano observatory, Mele mixes vinegar with baking soda and sees vigorous fizzing. Is this evidence of a chemical change? Explain what the bubbles suggest, and say why fizzing alone is not always conclusive proof.
8.Choose a chemical change you have noticed in everyday life. Name it and write one question you could investigate to learn why it happens.
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