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Notes on ice and salt structures
At this stage, we will use the term ‘atom’ for
the sake of simplicity: we are not considering ions or ionic
bonding.
Notes on ice and salt structures (zoom animation)
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For simplicity,
these are ‘2-d’ rather than ‘3-d’
images.
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The two different structures are a result of different types
of bonding. There are three types of bonding: covalent,
ionic and metallic. The type used depends on the atoms involved:
i.e. what is bonding to what.
Some combinations of atoms will lead to molecular structures.
At this stage students simply need to understand that atoms
do bond and that there are two possible structures.
Notes on structure and repeating unit of salt
The animation and accompanying image make the point that salt
– unlike ice – has no obvious molecules, but it
does have a repeating pattern (again, this is a simplified
‘2-d’ version) and we can think of these ‘repeat
units’ as
being what gives salt its particular properties. It does not
matter whether we see this as a repeat pattern
of ‘vertical’ or of ‘horizontal’ units.
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Science Enhancement Programme CD-ROM 2005 |
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user
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