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Year 7 - Science

Boiling and condensing

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 boiling point of water and explain what happens to particles when a substance in the gas state condenses.

Key Notes

  • The condensing point and boiling point are the same temperature for a substance, for water this is 100°C.
  • Steam is water in the gas state.
  • A substance increases in volume in the gas state when boiled.
  • A substance decreases in volume in the liquid state when condensed.
  • Particles move further apart when boiled and move closer together when condensed.

Vocabulary To Learn

  • boiling: when a substance in the liquid state is heated, and gas bubbles are formed.
  • boiling point: the temperature at which a substance changes from a liquid state to a gas state.
  • condensing: when a substance in the gas state is cooled and changes to a liquid state.
  • condensing point: the temperature at which a substance changes from a gas state to a liquid state.

Common Mistakes To Avoid

  • Pupils tend to think that all gases are made of air. That gases contain no particles.

3 Quick Questions (With Answers)

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

The condensing point and boiling point are the same temperature for a substance, for water this is 100°C. Steam is water in the gas state.

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

when a substance in the liquid state is heated, and gas bubbles are formed. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: Pupils tend to think that all gases are made of air. That gases contain no particles. Correction: Ensure that pupils gain the knowledge that the particles are the substance and between the particles there is nothing.

More Lessons In This Unit

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