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Topic 5 solid structure

(a) recall and describe the crystal structures of sodium chloride and caesium chloride,
including the crystal coordination numbers and a simple explanation of the
differences in terms of the relative sizes of the cations

Cs+ has a larger ionic radius the Na+
therefore caesium can accommodate…

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Iodine, I2
Iodine is a dark grey crystalline solid with a purple vapour. M.Pt: 114°C. B.Pt: 184°C.
It is very, very slightly soluble in water, but dissolves freely in organic solvents.
Iodine is therefore a low melting point solid. The crystallinity suggests a regular
packing of the molecules.




The structure…

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(e) explain the relationship between physical properties (e.g. hardness, volatility and
electrical conductance) and structure and bonding for the examples above

(f) understand that a socalled `smart' material is able to exhibit a change in properties
with a change in conditions (temperature, pH, etc) and this is often caused by…

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to certain stimuli such as temperature, exposure to infrared radiation or change in pH.
Possible applications could be
Artificial muscles
Underground water cut off in the oil industry.
The volume of gel can be pH controlled.
(g) understand that nanosized materials often exhibit different properties which can lead
to new…

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