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Year 7 - Science

Melting: melting points and freezing points

Solid, liquid, gas states and changes of state

Unit Summary

This unit covers the properties of solids, liquids, and gases using the particle model, including gas pressure. It explains changes of state in terms of the particle model while developing skills in using appropriate techniques, apparatus, and materials in lab work.

Lesson Summary

You will learn to measure the melting point and freezing point of a substance.

Key Notes

  • When it melts, a substance changes from the solid state to the liquid state.
  • When it freezes, a substance changes from the liquid state to the solid state.
  • At temperatures below its melting point, a substance is in its solid state.
  • At temperatures above its freezing point, a substance is in its liquid state.
  • The melting point and freezing point of a pure substance are the same temperature.

Vocabulary To Learn

  • liquid state: Substances in the liquid state will take the shape of their container.
  • solid state: Particles in a substance in a solid state are in a fixed position and can only vibrate.
  • melting point: The melting point of a substance is the temperature at which it changes from a solid state to a liquid state.
  • freezing point: The freezing point is the temperature at which a substance changes from a liquid state to a solid state.

Common Mistakes To Avoid

  • Some pupils can't understand that substances can change from one state to another state.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

When it melts, a substance changes from the solid state to the liquid state. When it freezes, a substance changes from the liquid state to the solid state.

2. Define this scientific word and use it in context. 'liquid state'

Substances in the liquid state will take the shape of their container. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Some pupils can't understand that substances can change from one state to another state. Correction: Ensure that the language used is solid state, liquid state and gas state, not solid, liquid and gas.

More Lessons In This Unit

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