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Understand The Movement of Particles in Changes of State

In this worksheet, students will study the movement of particles in changes of state.

'Understand The Movement of Particles in Changes of State' worksheet

Key stage:  KS 3

Year:  Year 7 Science worksheets

Curriculum topic:   Chemistry: The Particulate Nature of Matter

Curriculum subtopic:   Changes of State: Particle Model

Difficulty level:  

Worksheet Overview

What happens to the ice in your drink on a hot day, and what happens to the water vapour in the air as it touches a cold window?


ice cubes melting


That's right, they change state. The particles in the ice and the water vapour are behaving differently as they are heated or cooled. Let's find out more.


particles in solids, liquids and gases


As you can see, when heated, particles in a substance gain energy. This means that they can move around more and when they gain enough energy, they can move further apart and eventually change state. The opposite happens when a substance is cooled. The particles lose energy and become closer together. 


There are some important words in the diagram above that you'll need to remember about state changes. One that you may not have come across before is subliming. Sublimation happens when a solid is heated and changes directly into a gas, skipping the liquid state altogether. This is what happens to solid carbon dioxide, or 'dry ice' as it is known. 


Got it? Let's try some questions on heating and cooling and the resulting changes of state. 


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