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Understand The Movement of Particles in Changes of State

In this worksheet, students will show their understanding of the movement of particles in changes of state.

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

Key stage:  KS 3

Year:  Year 8 Science worksheets

Curriculum topic:   Chemistry: The Particulate Nature of Matter

Curriculum subtopic:   Changes of State: Particle Model

Difficulty level:  

Worksheet Overview

Substances can change states - from solid to liquid to gas, and back again. This usually happens when they are heated or cooled.


Energy plays a big role in changes of state.


Let's find out more.


particles in solids, liquids and gases


As you can see, when heated, particles in a substance start to move around more and get further apart - the more they are heated the further apart they get and eventually the substance will change state. This is because the particles are absorbing energy from their surroundings. The opposite happens when a substance is cooled. The particles slow down and become closer together because they are transferring energy to the surroundings. 


There are some important words in the diagram above that you'll need to remember about state changes.


Freezing and condensing are the words we use to describe changes of state when energy is released.

Boiling, evaporatingmelting and subliming are the words we use to describe changes of state when energy is absorbed.


You've probably come across most of these before. 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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