Chemistry 162
Study Guide
Chapters 9&10
1. Which of the following species has the shortest bond distance?
a. CO
b. NO
c. O2
d. F2
e. Cl2
2. The nitrogen atom would be expected to have the positive end of the dipole in
a. NH3 .
b. Ca3N2 .
c. HCN
d. AlN.
e. NO.
3. In which of the following species is resonance most likely to take place?
a.
O
b.
N
O
O
c.
C
O
Cl
Cl
H3 C
O
||
C
d. H - CN
e.
F
F- B - F
CH3
F
4. Which one of the following elements would be expected to have the largest atomic covalent radius?
a. Li
b. Cs
c. F d. Br
e. I
5. Which one of the following ions would be expected to have the largest atomic ionic radius?
a. Li+
b. Cs+
c. F- d. Br- e. I6. Which one of the following atoms should have the largest value for the electron affinity of the free
atom? Then, which has the smallest electron affinity? Atoms are designated by electronic configuration.
a. 1s2 2s2 2p6 3s1
b.1s2 2s2 2p5
c. 1s2 2s2 2p6 3s2 3p2
d. 1s2 2s2 2p6 3s2 3p6 3d5 4s2
e. 1s2 2s2 2p6
7. Interactions between metals and non-metals primarily involve:
a. interactions between protons.
b. interactions between protons and electrons.
c. interactions between protons, electrons and neutrons.
d. transfer of electrons.
e. sharing of electrons.
8. Which of the following is the best explanation for a covalent bond?
a. electrons simultaneously attracted by more than one nucleus.
b. the overlapping of two, electron filled orbitals of different energies.
c. the overlapping of unoccupied orbitals of two or more atoms.
d. a positive ion attracting a negative ion. e. an interaction between outer electrons.
9. Draw the Lewis Dot structure for :
a. SbCl3
b. NH4+
c. P3d. N2H2
e. HCN
f. IF5
For a, d, e and f describe the bond between each of the atoms in theses molecules as to polarity.
10. In which one of the following atoms is the 1s orbital the smallest?
a. Cl
b. F c. Br d. I e. the 1s orbital is the same size in all of these atoms.
11. Write the chemical equation for the first ionization of fluorine.
12. How many unpaired electrons are there in the O2- ion?
13. Select the compound in which the cation and anion are closest together.
a. KF
b. K2S
c. RbCl
d. SrBr2
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Chemistry 162
Study Guide
Chapters 9&10
14. Which one of the following bonds would be the most polar?
a. Na - S
b. P - S
c. C - F
d. Si - Cl
15. Draw all the resonance structures for NO3-. Are any of these three the ‘true’ structure? Explain.
16. Using the average bond energies listed below, calculate the likely H for the reaction:
H - C  C - H (g) + H - I(g)  H2C = CHI(g)
C  C 835; C = C 602;
H-I 295; C-I 213; C - H 411 (all in kJ/mol)
17. Write a formula for the most ionic binary compound possible. Then write a formula for the most
covalent compound possible. (There may be more than one correct answer for each)
18. From an energy standpoint what do we mean when we say a given bond is stronger than another
bond?
19. Determine bond length for the compounds listed below.
a. MgO
b. BaO
c. LiF
d. CsI
Compare your results and explain the significant differences.
20. The following question pertains to compounds that have the molecular formula C2H2Br2 .
H
Br
\
/
C===C
/
\
H
Br
x
H
H
\
/
C===C
/
\
Br
Br
y
H
Br
\
/
C===C
/
\
Br
H
z
Circle the compound(s) which is(are) polar.
21. When a carbon atom has sp2 hybridization, it has
a. four  bonds.
b. three  bonds and one  bond.
d. one  bond and three  bonds.
e. four  bonds.
22. A
a.
c.
e.
c. two  bonds and two  bonds.
 (pi) bond is the result of the
overlap of two s orbitals.
b. overlap of an s orbital and a p orbital.
overlap of two p orbitals along their axes.
d. sidewise overlap of two parallel p orbitals.
sidewise overlap of two s orbitals.
23. The bonding in acetylene, C2H2 , is best described as
a. five  bonds.
b. two  bonds and three  bonds.
c. five  bonds.
d. four  bonds and one  bond.
e. three  bonds and two  bonds.
24. The bond order of a molecule with equal numbers of bonding and anti-bonding electrons is?
a. 1
b. 1.5
c. 0
d. 0.5
e. none of these
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Chemistry 162
Basic
Geometry
Study Guide
Molecular
Geometry
Hybridzation
Chapters 9&10
Bonding
description
Polar/
non-polar
COS
TeCl4
BrF5
ICl3
25. The greatest factor in distortion of bond angles from ideal bond angles is?
a. Differences in electronegativity.
b. Multiple bonding between atoms.
c. Lone pairs of electrons.
d. the basic geometric shape of the molecule
e. The molecular shape of the molecule
26. Draw in below the molecular orbital chart for the molecule NO-. Be sure to correctly label all atomic
and molecular orbitals. Calculate and list at the bottom the bond order of the molecule.
Bond Order ________
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