Chem R110 - Elementary Chemistry » Spring 2021 » Quiz 10

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Question #1
The change of a substance from a liquid to a gaseous form is called:
A.   vaporization.
B.   heat of fusion.
C.   volatile.
D.   dynamic equilibrium.
E.   condensation.
Question #2
Evaporation is:
A.   the opposite process to condensation.
B.   All of these
C.   an endothermic process.
D.   increased by increasing temperature.
E.   a cooling process for humans when they sweat.
Question #3
As the attractive forces between the molecules of a liquid increase, its surface tension
A.   decreases.
B.   increases.
C.   remains the same.
Question #4
Hydrogen bonding will not occur in molecules that contain only bonds between hydrogen and
A.   nitrogen.
B.   bromine.
C.   fluorine.
D.   oxygen.
Question #5
Which one of the following bonds will be most polar?
A.   O-F
B.   N-Cl
C.   C-F
D.   N-N
Question #6
A sample of water at 20. °C contains
A.   neither, covalent nor hydrogen bonds.
B.   hydrogen bonds only.
C.   both, covalent and hydrogen bonds.
D.   covalent bonds only.
Question #7
Under standard conditions, what is the vapor pressure of water at 100.°C?
A.   760 torr
B.   0 torr
C.   373 torr
D.   100 torr
Question #8
What quantity of heat would be required to melt 15 g of ice at 0 °C? The heat of fusion of ice is 335 J/g.
A.   0.20 J
B.   90. kJ
C.   7.2 kJ
D.   5.0 kJ

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