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TGI2:
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Notes on animation and video for ammonia dissolving
in water.
This uses particle theory ideas to introduce the possibility
that a sample in the gas state can dissolve in water.
Once again, the animation sequence concentrates on the mixing
effect rather than the collisions by which this happens. The
reduction in volume shown in the video is striking, and the
particle theory explanation of what happens to the particles
when a bubble dissolves should help students make sense of
what they see.
Language Alert
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Some books contain phrases like ‘a solution of
a solid in water’, where ‘solid’ refers
to the state of a pure sample of the substance before
it is added to the water. |
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The dissolved substance can not still
be ‘a solid’. We can only talk about ‘state’
when the particles of a substance are together with
each other. |
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Individual particles do not have a state.
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Science Enhancement Programme CD-ROM 2005 |
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user
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