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Reversible and Irreversible Changes
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Reversible and Irreversible Changes
At a football tournament, Bodhi, Zach and Mei help prepare snacks and equipment. Read each situation carefully: a reversible change can be undone to recover the original material, while an irreversible change makes new substances or cannot easily be undone. Answer every question.
Spot the change
1.The ice in the team’s chilly bin melts during the match. Which statement best describes this change?
- It is reversible because the water can be frozen back into ice.
- It is irreversible because the ice has disappeared.
- It is irreversible because all changes involving heat make new substances.
- It is reversible only if the water is boiled.
2.Two changes happen at the team’s equipment area: an ice cube melts into water, and an egg is cooked. Identify which change is reversible and explain what could be done to reverse it.
3.Mei says, “Cooking the egg is reversible because it can cool down again.” Is Mei correct? Explain why or why not.
4.Zach dissolves table salt in a glass of water. Which method would best recover the salt?
- Filter the salt water through a sieve.
- Let the water evaporate, leaving the salt behind.
- Freeze the glass and remove the ice.
- Stir in more water.
5.A football goalpost has rusted. Is this change reversible or irreversible? Give one reason for your answer.
Investigate and explain
6.At the snack table, Bodhi warms a piece of chocolate until it melts. Is this usually reversible or irreversible? Describe how to reverse the change.
7.The team bakes a cake for the post-match celebration. Explain why baking the cake is an irreversible change, even if it cools down afterwards.
8.True or false? “Every change that involves heating is irreversible.” Give one example to support your answer.
TrueFalse
9.Complete the sentence: When salt dissolves in water, the change can be reversed by the water.
10.Complete the sentence: When salt dissolves in water, it can be recovered because it has .
11.Bodhi’s team wants to demonstrate one reversible and one irreversible change safely at a future tournament. Suggest one example of each and explain how you would tell them apart.
Draw a simple before-and-after example of a reversible change. Add arrows to show how the material changes and how it can return to its original state.
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