Hydrogen Bonding Page 2
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2C h e m g u i d e – q u e s t i o n s
b) ethoxyethane, CH
CH
OCH
CH
3
2
2
3
c) hydrogen sulphide, H
S
2
d) ethylamine, CH
CH
NH
3
2
2
H
O
O
e) sulphuric acid, H
SO
, bonded as:
2
4
S
H
O
O
f) chloroethane, CH
CH
Cl
3
2
g) fluoroethane, CH
CH
F
3
2
h) hexane, CH
CH
CH
CH
CH
CH
3
2
2
2
2
3
4. A question to think about!
CH
3
Propanone has the structure:
C
O
CH
3
There are two lone pairs on the oxygen atom.
Trichloromethane (chloroform) has the formula CHCl
. Three chlorines and a hydrogen are
3
attached to a central carbon atom.
When propanone and trichloromethane are mixed a hydrogen bond is formed between the two
molecules, although no hydrogen bonding exists in either of the pure liquids.
a) Explain why there is no hydrogen bonding in either propanone or trichloromethane when the
liquids are pure.
b) Can you suggest a reason why hydrogen bonds are formed when the two liquids are mixed?
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