Year 7 - Science
Particle model of substances in the gas state
Solid, liquid, gas states and changes of state
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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 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 describe how the arrangement and movement of particles alters when a substance changes from the liquid to gas state.
Key Notes
- In the gas state a substance can flow, it fills the whole of a container and can be compressed.
- In the gas state, particles of a substance are moving very quickly in random directions with gaps between them.
- In the gas state, particles have enough energy to be free of the attractive forces between them.
- There is nothing at all between the particles in a gas.
Vocabulary To Learn
- gas state: Substances in the gas state can be compressed to take up less space.
- particle: All substances are made of tiny particles, these move differently depending on the state of matter of the substance.
- random movement: In a gas state the particles have a random movement, they move in all directions.
- compress: Compress means that something can be made to take up less space than before. Substances in the gas state can be compressed.
Common Mistakes To Avoid
- The idea that there is air between the particles in a gas.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
In the gas state a substance can flow, it fills the whole of a container and can be compressed. In the gas state, particles of a substance are moving very quickly in random directions with gaps between them.
2. Define this scientific word and use it in context. 'gas state'
Substances in the gas state can be compressed to take up less space. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: The idea that there is air between the particles in a gas. Correction: Emphasis on explaining that air contains particles and has nothing between them.
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