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I2.2: USING PARTICLE IDEAS TO EXPLAIN DISSOLVING (2)
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When a droplet of glycerine dissolves, repeated collisions with the water particles make the glycerine particles separate and become mixed up with the water particles.

The animation represents a ‘time lapse’ sequence of snapshots, showing this happening.

The glycerine is still ‘there’, but we can’t see it because we can only see groups containing large numbers of particles: we can’t see individual particles.


 

Notes: see Teachers’ Guide
 
teachers’ guide i1



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i1: dissolving
i2: recognising
i3: gas
i4: state
i5: mixtures

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