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Understand Physical Changes

In this worksheet, students will test their knowledge of physical, reversible changes and check their understanding of the key vocabulary.

'Understand Physical Changes' worksheet

Key stage:  KS 2

Curriculum topic:   States of Matter

Curriculum subtopic:   Reversible Changes

Difficulty level:  

Worksheet Overview

Ice cube Blow torch    Sun

 

Look at this diagram carefully.  It shows how materials change between, solids, liquids and gases:

 

  melting   evaporation  
     
SOLID   LIQUID   GAS
     
  freezing   condensation  

 

Now look at it again.  What's happening to change a solid to a liquid to a gas?  It's being heated.

What's happening to change a gas to a liquid to a solid?  It's being cooled.

 

These are physical changes and they can be reversed, which means they go back to what they were before.  When materials change in this way, it's called changing state.  Do you notice each special word as the state changes (melting, condensing, etc.)?

Water is the most obvious example to demonstrate how it changes state.  In the diagram above, replace:

Solid with Ice

Liquid with Water

Gas with Steam (or, better, water vapour).

 

Now, run through that diagram, and its words, again with all the watery words.

 

Does that make sense?  Of course, many substances you come across will change like this - water's just an obvious example.

 

OK, to be able to talk about and describe these changes, we must understand the science vocabulary associated with each of the physical changes.  So, let's check on that.

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