Version 001 – HW12-Bonding – sparks – (52100)
This print-out should have 23 questions.
Multiple-choice questions may continue on
the next column or page – find all choices
before answering.
1
1. single, triple, double
2. double, single, triple
3. double, triple, single
Bond Type Ionic
001 10.0 points
Which pair of elements is most likely to form
an ionic compound?
1. magnesium and fluorine correct
2. nitrogen and sulfur
3. oxygen and chlorine
4. sodium and aluminum
Explanation:
Mg is a metal and F is a nonmetal. N and
S are both nonmetals. O and Cl are both
nonmetals. Na and Al are both metals.
Mlib 03 0009
002 10.0 points
Compounds which are characterized as covalent are generally made up of elements found
in which part of the Periodic Table?
1. lower left
2. left and right
3. upper right correct
4. upper left
Explanation:
Covalent compounds are formed from elements with small ∆EN , or nonmetal elements.
These are found in the upper right corner of
the periodic table. Very metallic elements are
found in the lower left corner of the periodic
table.
Bond Strength Order W
003 10.0 points
Which is the correct order of increasing bond
strength?
4. triple, double, single
5. single, double, triple correct
Explanation:
More energy is required to break a triple
bond than a double bond, and more energy
for a double bond than a single bond.
ChemPrin3e 02 74
004 10.0 points
Which do you predict to have the strongest
CN bond?
1. HCN correct
2. All are equal
3. NHCH2
4. NH2 CH3
Explanation:
The bond orders as determined by drawing
the Lewis structures are 2 for NHCH2, 1 for
NH2 CH3 , and 3 for HCN; therefore HCN will
have the greatest bond strength.
Mlib 03 0079
005 10.0 points
Which of the following contains only covalent
bonding and no ionic bonding?
1. NaOH
2. CCl4 correct
3. NaCl
4. Ca(NO3 )2
5. Na2 SO4
Explanation:
In NaCl, Na is a metal, and Cl is a non-
Version 001 – HW12-Bonding – sparks – (52100)
metal. An ionic bond would be expected
to form in this compound.
In Na2 SO4 ,
Ca(NO3 )2 , and NaOH, a polyatomic ion is
present. While covalent bonds attach the
atoms within the polyatomic ion, ionic bonds
connect these polyatomic ions to their metal
atoms. Only CCl4 , which contains 4 C
Cl
bonds (which involve bonding between two
nonmetallic elements), contains only covalent
bonds.
Mlib 03 1107
006 10.0 points
What total number of valence electrons
should appear in the dot formula for the chlorate ion ClO−
3?
1. 28
b b
5.
b
b
b
b
b
b
O O
b b
b b
6.
b
b
b
b
O O
b b
7.
b
b
b
8.
bb
bb
O O
b
b
b
b
b
O O
Explanation:
N = 8 × 2 = 16
A = 6 × 2 = 12
S = N − A = 16 − 12 = 4
There are 4 shared electrons. The remaining electrons are placed around the oxygen
atoms such that each has an octet.
The Lewis dot formula for oxygen (O2 ) is
2. 26 correct
b
b
O
bb
3. 24
4. 32
5. 30
Explanation:
Chlorine has 7 valence electrons and oxygen 6. The overall −1 charge indicates that
there is 1 extra electron. The total number of
valence electrons is
1 × 7 e− (from Cl) + 3 × 6 e− (from O)
+1 e− (from −1 charge) = 26 e−
2
b
b b
b b
b
O
bb
Brodbelt 779
008 10.0 points
How many lone pairs of electrons are on
nitrogen in NF3 ?
1. thirteen
2. four
3. one correct
4. twenty
Brodbelt 07 09
007 10.0 points
What is the correct Lewis formula for oxygen (O2 )?
b
b
b
b
O O
b
b b
b
b
b b
b
b
b b
N
b
b
b b
Explanation:
b
b
O O
b
b
2.
8. two
b b
O
bb
b
b b
b b
O
The Lewis structure is
F
b
b
b
O
b
b
b
b
b
b
bb
correct
F
b
b
O
b b b
b b b
F
b
b
4.
b
b
b
b
3.
b
b
b
6. ten
7. three
b b
bb
1.
5. none
Brodbelt 8200410
b
b
b
b
Version 001 – HW12-Bonding – sparks – (52100)
009
10.0 points
b
How many unshared electrons and bonding
electrons exist around the central atom in
ozone (O3 )?
b
b
C
4.
b
C
b
H
b
b
b
5.
H
2. zero; eight
H
b
b
b
b
C
1. none; two
3
b
b
C
H
3. one; three
6.
H
4. one; six
5. two; two
b
b
7.
C
H correct
C
b b
b b
b b
H
C
C
b b
b
b
6. four; four
b
b
b b
H
b
b
b b
b b
7. four; three
H
8.
C
C
b
b
b b
8. three; six
b
b
H
b
b
b b
9. two; six correct
H
9.
b
b
b
b
b
b
↔
b
b
b
b
O
b
b
b
b
O
O
O
O
b
C
b
b
b b
b
b
H
b
C
b
b
H
b
C
C
C
F Cl
b
b
b b
C
b b
b b
C
b b
b b
H
H
b b
1.
b
b
F Cl
b
b
b b
b b
b
b
b
b
Explanation:
The Lewis formula for acetylene (ethyne,
b
b
b b
H
H
C
b b
2.
b
b
b
b
C
b
b
b b
3.
b
b
H
Lewis ClF dash
011 10.0 points
Which of the following is the correct Lewis
formula for chlorine fluoride (ClF)?
b
b b
H
10.
C2 H2 ) is
b
b
C
b b
2.
H
H
b
b
b
b
b
b
b
b
b
b
C
b
b
Lewis C2H2 dash
010 10.0 points
Which of the following is the correct Lewis
formula for acetylene (ethyne, C2 H2 )?
H
C
b b
O
b
b
b b
b b
Explanation:
1.
b b
b
b
bb
3.
bb
F Cl
bb
b
b
bb
b b
4.
b
b
b b
F Cl
b b
b b
b
b
correct
Version 001 – HW12-Bonding – sparks – (52100)
b
5.
b
6.
b
b
7.
b
b
(an ionic compound) contains 4 unshared
pairs; and H2 S contains 2 unshared pairs.
b b
b
b
b
F Cl
b
4
b b
b b
b
F Cl
b
b b
Mlib 72 0511
013 10.0 points
Consider the following table of electronegativities.
b
b
F Cl
b
b
b b
8.
b
b
1A
H
2.1
Li
1.0
Na
0.9
b
b
F Cl
b b
9.
10.
F Cl
b
b
b
b
F Cl
b
b
b
b
Explanation:
The Lewis formula for chlorine fluoride
(ClF) is
F Cl
b b
b b
b b
b b
b
b
b
b
Mlib 03 1137
012 10.0 points
Which of the following contains exactly one
unshared pair of valence electrons?
1. SiH4
2A
3A
4A
5A
6A
7A
Be
1.5
Mg
1.2
B
2.0
Al
1.5
C
2.5
Si
1.8
N
3.0
P
2.1
O
3.5
S
2.5
F
4.0
Cl
3.0
8A
He
−
Ne
−
Ar
−
Calculate the difference in electronegativity
between C and N.
1. 1.0
2. 3.0
3. 0.5 correct
4. 2.0
2. PH3 correct
Explanation:
3. NaCl
CIC T05 15
014 10.0 points
The letters in the periodic table are used to
identify four different elements.
4. C2 H4
5. H2 S
Explanation:
The PH3 molecule contains exactly 1 unshared pair of valence electrons:
··
H
H
P
A
BCD
H
You can check this structure for correctness
by verifying that each atom has the correct
number of electrons around it (8 for most elements, 2 for hydrogen) and that the structure
shows the correct total number of valence electrons (calculated by adding up the available
valence electrons from each atom).
The C2 H4 molecule contains no unshared
pairs; SiH4 contains no unshared pairs; NaCl
Based on periodic table trends, which element is expected to have the GREATEST
tendency to attract a shared pair of electrons?
1. A
2. D
3. B
Version 001 – HW12-Bonding – sparks – (52100)
4. C correct
Explanation:
Electronegativity (the ability to attract a
shared pair of electrons) increases going to
the right and upward in the periodic table.
Mlib 03 5043
015 10.0 points
The electronegativity of nonmetals is relatively (high, low, the same) as compared to
metals.
1. low
2. high correct
3. the same
Explanation:
Both electronegativity and nonmetallic
character increase from left to right and from
bottom to top of the Periodic Table.
Mlib 03 6039
016 10.0 points
Which of the following elements would be expected to have the highest electronegativity?
5
tronegativity (decreases, increases) in going
from left to right and (decreases, increases) in
going from top to bottom.
1. increases; decreases correct
2. increases; increases
3. decreases; decreases
4. decreases; increases
Explanation:
As the elements become less metallic their
electronegativities increase.
Mlib 50 5002
018 10.0 points
Which of the following bonds will be the most
polar?
1. S
F correct
2. C
N
3. C
H
4. Cl
O
Explanation:
1. Al
2. P
3. Na
Mlib 72 0532
019 10.0 points
What is the difference in electronegativity between H and F?
4. N correct
1. 0.63
5. C
2. 0.95
6. He
3. 3.8
Explanation:
Electronegativity generally increases from
left to right and from bottom to top of the
Periodic Table. The Noble gases are excluded
in that they are rather inert.
Explanation:
On the Pauling scale the electronegativities
of H and F are 2.1 and 4.0, respectively.
Mlib 75 0067
017 10.0 points
Generally speaking, in the periodic table, elec-
Mlib 75 0049
020 10.0 points
Which bond is most polar?
4. 1.9 correct
Version 001 – HW12-Bonding – sparks – (52100)
1. P
I
2. P
Cl correct
3. I
6
3. polar, with the chlorine end having a
partial negative charge. correct
4. nonpolar, with the chlorine end having a
partial negative charge.
Cl
4. Cl
Cl
Explanation:
Mlib 76 1048
021 10.0 points
Which substance has nonpolar covalent
bonds?
1. NaCl
2. O2 correct
3. NO2
4. CO
Explanation:
Mlib 76 1050
022 10.0 points
Which substance has polar covalent bonds?
1. Cl2
2. NH3 correct
3. O2
4. Ca2 C
Explanation:
Sparks polar bond 001
023 10.0 points
You would expect a phosphorous-chlorine
bond to be
1. polar, with the phosphorus end having a
partial negative charge.
2. nonpolar, with the neither end having a
partial charge.
5. polar, with neither end having a partial
charge.
6. nonpolar, with the phosphorus end having
a partial negative charge.
Explanation: