9/27/2008
Chemistry 20 Unit A –
Bonding Quiz 2
MC – Place all answer sheets on the Scantron™ sheet provided. (1 mark each)
Name: __________
Date: __________
Block: __________
1. A Lewis symbol for a nitrogen atom should show
a) 1 lone pair and 3 bonding electrons
b) 2 lone pairs and 2 bonding electrons
c) 2 lone pairs and 3 bonding electrons
d) 3 lone pairs and 1 bonding electron
2. The concept of multiple covalent bonds is used to explain the molecular formula of
A. O2
C. C2H6
B. NaCl
D. F2
3. Hydrogen fluoride and water have many similar intermolecular bonds, which account for their high
melting and boiling points. The intermolecular bonds that they both possess are
a) London forces only
b) London forces and dipole-dipole forces only
c) Hydrogen bonding only
d) London forces, dipole-dipole forces, and hydrogen bonding
4. The molecular shapes for carbon tetrachloride and hydrogen bromide are
a) linear and angular
c) tetrahedral and linear
b) tetrahedral and V-shaped
d) pyramidal and linear
5. The covalent bond that is most polar is between
a) C–H
c) H–Br
b) O–H
d) H–H
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9/27/2008
6. Methane, CH4(g), and chloromethane, CH3Cl(l), differ in state at SATP mainly because
a) methane is nonpolar and chloromethane has hydrogen bonding
b) methane is nonpolar and chloromethane has dipole-dipole forces between molecules
c) chloromethane and methane have the same tetrahedral shape and are nonpolar molecules
d) chloromethane has a lower boiling point than methane
Use the following information to answer the next four questions.
A
LiCl(s) solid lithium chloride
B
SeF2(l) liquid selenium fluoride
C
CH4(g) methane gas
D
NH3(l) liquid ammonia
7. The substance that most likely has the highest melting point and boiling point is
a) A
c) C
b) B
d) D
8. The substance that is angular or V-shaped around one atom and contains two covalent bonds is
a) A
c) C
b) B
d) D
9. The compound that is nonpolar with a tetrahedral shape is
a) A
c) C
b) B
d) D
10. The substance that has hydrogen bonding, dipole-dipole forces, and has a pyramidal shape is
a) A
c) C
b) B
d) D
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9/27/2008
11. The substance that contains a triple covalent bond and has only London forces between molecules is
a) methane gas, CH4(g)
b) oxygen gas, O2(g)
c) chlorine gas, Cl2(g)
d) nitrogen gas, N2(g)
Use the following table to answer the next question.
Hydrogen halide
Chemical formula
A
hydrogen bromide
HBr
B
hydrogen fluoride
HF
C
hydrogen chloride
HCl
D
hydrogen iodide
HI
12. The hydrogen halide compound with the highest melting and boiling points is most likely
a) hydrogen iodide because it has the strongest London forces
b) hydrogen fluoride because it has London forces, dipole-dipole forces, and hydrogen bonding
c) hydrogen fluoride because it has the lowest number of electrons and a linear shape
d) hydrogen iodide because it has London forces, dipole-dipole forces, and hydrogen bonding
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9/27/2008
Written Response: Answer in complete sentences.
1. Some of the physical properties of water include:
 a high boiling point,

adhesion to surfaces,
 cohesion of particles,
 and attraction of a thin stream to charged objects.
Explain each of these properties using ideas presented in class. Draw a Lewis Dot Diagram to start. (5
marks)
2. Using VSEPR theory, describe how it is possible to determine if a molecule will form a trigonal planar
or a trigonal pyramidal shape. Give one example chemical structure of each shape in your explanation. (4
marks)
Bonus Questions: Answer only ONE!!!
Fair Bonus Question: What was Pauling’s first name and what was his contribution to the field of chemistry?
Unfair Bonus Question: What is LD’s fiancée’s first name and what does she do for a living?
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