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 Form 2 Chemistry Sample Revision Questions With Answers

Carbon (IV) Oxide sublimes at -78^o C. It is called dry ice
a).Why is it called dry ice?
b).It is used for keeping ice cream cold. Why is it preferred to ordinary ice?
c).Name two other substances that behave as dry ice
d).Give an industrial application of sublimation

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Answer Text:
a) Sublimes without leaving a liquid
b) -Leaves no liquid to spoil cream
-Takes longer to sublime
-Has a wider sublimation temp.
c) Iodine Iron III chloride naphthalene
d) Extraction of Zinc metal.


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