Year 4 - Science
Changing state: liquid to solid
Introduction to states of matter and changing states
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores the properties of solids, liquids, and gases, and how materials change state when heated or cooled. It covers evaporation, condensation, and the water cycle, with a focus on practical enquiries, careful observations, accurate measurements, and presenting findings.
Lesson Summary
You will learn to observe that some materials change state from liquid to solid when they are cooled.
Key Notes
- We can change the state of a liquid to a solid by changing its temperature.
- Water is a liquid at room temperature but becomes a solid (ice) when it is cooled down.
- The process in which a liquid changes to a solid is called freezing.
- Different materials can be observed changing from liquid to solid when cooled.
Vocabulary To Learn
- state: Materials can exist in three common states of matter: solid, liquid and gas.
- solid: A solid has a fixed shape and volume but some solids can change shape when a force is applied.
- liquid: A liquid can flow, has a fixed volume and takes the shape of the bottom its container.
- freeze: To freeze is to change from a liquid state to a solid state.
Common Mistakes To Avoid
- Children think that materials can only change from a liquid to solid state at temperatures below 0°C. They also believe that the change is irreversible.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
We can change the state of a liquid to a solid by changing its temperature. Water is a liquid at room temperature but becomes a solid (ice) when it is cooled down.
2. Define this scientific word and use it in context. 'state'
Materials can exist in three common states of matter: solid, liquid and gas. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Children think that materials can only change from a liquid to solid state at temperatures below 0°C. They also believe that the change is irreversible. Correction: Teaching slides give examples of materials which change from their liquid to solid state at temperatures higher than room temperature. Through investigation, children will observe that the change between solid state and liquid state is reversible.
More Lessons In This Unit
- Changing state: gas to liquid Study Guide
- Changing state: liquid to gas Study Guide
- Changing state: solid to liquid Study Guide
- Comparing and grouping solids, liquids and gases Study Guide
- Evaporation and condensation in the water cycle Study Guide
- Everyday examples of changing state: solids and liquids (non-statutory) Study Guide
- Everyday examples of evaporation and condensation (non-statutory) Study Guide
- Melting ice caps and glaciers (non statutory - Climate Change & Sustainability) Study Guide
- Melting temperatures: do and review Study Guide
- Melting temperatures: plan Study Guide
- Melting temperatures: research Study Guide
- Properties of solids, liquids and gases Study Guide
- Temperature and evaporation: do and review Study Guide
- Temperature and evaporation: plan Study Guide
- Thermometers and data loggers Study Guide
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