Particle model of substances in the gas state
Lesson details
Learning outcome
I can describe how the arrangement and movement of particles alters when a substance changes from the liquid to gas state.
Key learning 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.
- 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.
Keywords
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 misconception
The idea that there is air between the particles in a gas.
Emphasis on explaining that air contains particles and has nothing between them.
Teacher tip
Demonstrate sealed syringes filled with air and water.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is a particle?
Q2.When a substance is compressed, it is said to take up space than before.
Q3.What happens to the particles in a substance when it changes from the liquid to solid state?
Q4.When a substance changes from solid state to liquid state, it is said to have .
Q5.In which state of matter are particles closest together?
Q6.True or False? When a substance changes state, its mass will change (either increase/decrease)?
Assessment exit quiz
6 Questions
Q1.Which state of matter allows particles to fill the whole of a container and be compressed?
Q2.What is the primary characteristic of the movement of particles in the gas state?
Q3.Order the following states of matter based on the strength of the forces of attraction between particles. Start with the state of matter which has the strongest forces of attraction between particles.
Q4.Which is the correct definition of compression, when referring to substances in the gas state being compressed?
Q5.Why can substances in the gas state flow and fill the shape of their container?
Q6.Between particles in the gas state there is .
To help you plan your 7 science lesson on: Particle model of substances in the gas state, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 7 science lesson on: Particle model of substances in the gas state, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 science lessons from the Solid, liquid, gas states and changes of state unit, dive into the full secondary science curriculum, or learn more about lesson planning.