P.Set8 Cohesive Forces

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1. Which of the following has the highest boiling point?
a.
NH3
PH3
AsH3
b.
CH4
SiH4
GeH4
c.
Ne
Ar
d.
HF
HCl
HBr
e.
SO2
KCl
N2
Kr
SnH4
Xe
HI
6. Which of species can exhibit hydrogen bonding among themselves?
a.
H2Te
H2Se
H2O
H2S
b.
C6H6
NH3
B2H6
CaH2
c.
C3H8
H2
LiH
HF
9. At which temperature does water have its greatest density?
0 oC
4 oC
96 oC
100 oC
10. Classify in the order of increasing boiling points the following compounds :
CH3CH2OH, CH3COCH3 and CH3OH
11.Which of the following compounds would you expect to be the most volatile
A. C2H8
B. H2S
C. CH3OH
D. CH4
12. Which of the following compounds would you expect to have the highest boiling point?
Why?
a. CH3CH2OCH3 b. CH3CH2CH2OH c. CH3CH2CH3
Solution: CH3CH2CH2OH is the only one of the three molecules that contains OH groups which
will result in strong cohesive forces due to intermolecular hydrogen bonding.
13. All the following are liquids at room temperature. Which would you expect to be the most
volatile?
a. CH3CH2OH (propanol) b. Acetone c. Ethanol Solution: Acetone does not contain an OH
group and so there is no hydrogen bonding.
Acetone would be the most volatile.
14. Which of the following liquids would you expect to be least volatile? a. pentane b. hexane c.
octane d. decane
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