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Look at Mixing Substances

In this worksheet, students will be given a chance to look over the basics about what happens when substances are mixed together: what is dissolving, how can substances be separated from each other, and are changes reversible?

'Look at Mixing Substances' worksheet

Key stage:  KS 2

Year:  Year 5 Science worksheets

Curriculum topic:   Properties and Changes of Materials

Curriculum subtopic:   Dissolving and Solutions

Difficulty level:  

Worksheet Overview

When substances are mixed together some mix easily, others refuse to mix - how can you tell?

 

Can they be separated from each other - and if so, how?

Can the mixing be reversed?

 

Mixing beaker of solution

 

You'll have tried some of these out - salt or sugar added to water, for example. These dissolve in the water to form a solution - like salt solution.

Can you get them apart again? What about filtering?

 

Filtration

 

The dissolved salt is too small to be trapped in the filter paper, isn't it?

Maybe evaporation would work:

 

Evaporation

 

Now the water boils away, evaporating to leave the salt behind.

 

So, dissolving is a reversible change - you can get back what you started with.

 

What about non-reversible changes - what sort of changes are these?

 

Well, these are the sorts of questions that you'll be able to explore as you follow this activity through.

 

Let's get started.

 

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