States of Matter
States of Matter
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States of Matter
Use an engaging opening with ice, water and steam or water vapour if available. Briefly connect the title to everyday materials students already know.
Our learning goal
I can identify and describe the three main states of matter: solid, liquid, and gas.
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What words come to mind when you hear states of matter?
Use this to collect prior knowledge such as solid, liquid, gas, ice, water, air, shape, and particles. Invite pupils to notice which words appear most often.
Matter is all around us
Matter is anything that has mass and takes up space.
Matter can be found as a solid, liquid, or gas.
Ice, water and water vapour are all matter.
Keep this simple and concrete. Avoid going deeply into mass if students are not ready; focus on matter as 'stuff' that takes up space.
The three main states
The three main states of matter are solid, liquid, and gas.
They are different because of how their particles are arranged and how those particles move.
These differences help us identify what kind of material we are observing.
This is the key overview slide for the lesson arc. Emphasise that properties and particle behaviour are linked.
Solids keep their shape
A solid has a fixed shape.
A solid has a fixed volume.
It does not flow like a liquid.
Examples: rock, pencil, table, ice.
If helpful, hold up a classroom object and show that it keeps the same shape when moved.
Liquids can flow
A liquid has a fixed volume.
A liquid does not have a fixed shape.
It takes the shape of its container.
Examples: water, milk, juice, oil.
A common misconception is that liquids have no shape at all; clarify that they take the shape of the container they are in.
Gases spread out
A gas does not have a fixed shape.
A gas does not have a fixed volume.
It spreads out to fill the space around it.
Examples: air, water vapour, helium.
Children may think gas is 'nothing'. Reinforce that gases are matter even though we often cannot see them.
Comparing the three states
Solid: fixed shape, fixed volume
Liquid: no fixed shape, fixed volume
Gas: no fixed shape, no fixed volume
The state depends on how particles are arranged and move.
This slide ties the first subtopic together before moving into particle behaviour.
Which state has a fixed shape and a fixed volume?
Liquid
Gas
Solid
Steam
Checks the core comparison from slides 4 to 7. 'Steam' is included as a familiar example that some pupils may confuse with a separate state instead of recognising it as a gas.
Complete the comparison
A solid has a fixed shape and a fixed volume. A liquid keeps its volume but takes the shape of its container. A gas has no fixed shape and no fixed volume.
This echoes the exact comparison language from the first subtopic and reinforces the key vocabulary pupils need for later classification.
Particles in a solid
Particles are packed closely together.
They stay in a regular arrangement.
They only vibrate in place.
That is why a solid keeps its shape.
Use a simple particle model such as counters close together in rows. Stress that particles move a little by vibrating.
Particles in a liquid
Particles are still close together.
They are not fixed in one pattern.
They can move past each other.
That is why a liquid can flow.
Contrast carefully with solids: particles are still close, but they can slide around one another.
Particles in a gas
Particles are far apart.
They move quickly in different directions.
They spread out to fill the space.
That is why gases do not keep a fixed shape or volume.
You can mime particles moving freely around the room to make the idea memorable.
How particle movement changes matter
Particle arrangement and movement affect what we can observe.
Particles packed tightly and moving very little → solid
Particles close together and sliding past each other → liquid
Particles far apart and moving freely → gas
Use the arrow notation because the whole slide is about the causal link from particle behaviour to observable properties.
Slide heading
Slide text
Show a short video of ice, liquid water and water vapour, or an age-appropriate particle animation. Pause at key moments to point out shape, volume and particle movement.
Which particles are far apart and move quickly?
Solid particles
Liquid particles
Gas particles
Ice particles
Targets the particle model in slides 8 to 11. 'Ice particles' checks whether pupils confuse an example with the state itself.
Complete the particle facts
In a solid, particles are packed closely together and vibrate in place. In a liquid, particles can move past each other. In a gas, particles are far apart and spread out.
All blanks are load-bearing terms drawn directly from the particle slides. If needed, remind pupils to match the movement to the correct state.
Why does a gas spread out but a solid keep its shape?
Expected ideas: solids keep their shape because particles are closely packed and only vibrate; liquids change shape because particles can move past each other; gases spread out because particles are far apart and move freely. Accept simple sentence answers using shape, movement, and particles.
How we identify a solid
To identify a solid, look at its shape and volume.
A solid keeps its own shape when you move it or put it somewhere new.
If it stays the same size and shape, it is likely to be a solid.
Use classroom examples such as a rubber, book or spoon. Keep language tied to observation.
How we identify a liquid
A liquid can be poured and it flows.
It keeps the same amount, but its shape changes to match the container.
If a material changes shape but not amount, it is likely to be a liquid.
If possible, demonstrate with water in two differently shaped containers.
How we identify a gas
A gas spreads out and fills the space available.
We may not always see it, but we can often feel or detect its effects, such as moving air or a smell.
If it does not keep its own shape or volume, it is likely to be a gas.
Be careful with examples of smell; explain that we often smell tiny particles in air, which helps us notice gases around us.
Everyday examples
Solid: chair, toy brick, coin
Liquid: water, paint, shampoo
Gas: air in the room, steam, helium in a balloon
We can classify materials by their properties.
Link back to the classification task mentioned by the teacher. Encourage precise vocabulary: shape, volume, particles, movement.
Water can be all three
Ice is water as a solid.
Liquid water is water as a liquid.
Water vapour is water as a gas.
The same substance can exist in different states.
This is a helpful consolidating example. Avoid detailed heating and cooling explanations unless needed for extension.
You pour a material into a new cup. It changes shape but not amount. What is it?
A solid
A liquid
A gas
A particle
Application of the identification rules from slides 13 to 17. 'Particle' checks vocabulary confusion.
Complete the water example
Water can be all three states. Ice is water as a solid. Liquid water is water as a liquid. Water vapour is water as a gas.
Reinforces the final consolidation example that the same substance can exist in different states.
Which part helped you understand best?
Pictures
Video
Examples
Particle models
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What is one thing you will remember from this lesson?
Reflection only. Encourage pupils to name one key idea, example, or rule they will remember, such as fixed shape, fixed volume, or how particles move.
What part of states of matter still feels tricky?
Reflection only. Useful for checking misconceptions or parts that may need reteaching, such as volume, gases being matter, or particle movement.
Glossary
matter - anything that has mass and takes up space
solid - a state of matter with a fixed shape and a fixed volume
liquid - a state of matter with a fixed volume but no fixed shape
gas - a state of matter with no fixed shape and no fixed volume
particle - a very tiny piece of matter
shape - the form of an object or material
volume - the amount of space something takes up
Pre-teach and revisit these words for EAL learners. A visual word bank would pair well with this glossary.
Glossary
flow - move smoothly from one place to another
vibrate - move back and forth very quickly in one place
arrangement - the way particles are organised
observe - look carefully to notice details
classify - sort into groups using features or properties
Use these words repeatedly in oral explanations so pupils hear and use them in context.
