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TGI1: Dissolving
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Notes on the videos of four substances being added to water

Sugar. This dissolves. There are no pieces of sugar left. The mixture is clear.
Chalk. This does not dissolve. You can still see bits of chalk. The mixture is not clear.
Return to main content I1.1
Glycerine. This dissolves. There are no blobs of glycerine left. The mixture is clear.
Oleic acid. This does not dissolve. You can still see blobs of oleic acid.
Return to main content I1.2

Notes on the animations showing a grain and a droplet dissolving
Students need to understand that a ‘grain’ or ‘blob’ would contain millions of particles, but we can only show a small number in an animation. Similarly, the ‘time-lapse’ sequences show the particles spreading out over time rather than the collisions which cause this to happen. As with gases, the key point is that dissolving results in clear solutions because there are too few particles of solute grouped together for us to be able to see them.

Return to main content: sugar I2.1
 
Return to main content: glycerine I2.2
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