Chemistry for Engineers Homework Answers - Chapter 7
Chemistry Homework Questions
Chapter 7
In the HCN molecule, there are
a.
|
|
b.
|
.
|
c.
|
|
d.
|
|
e.
|
Which of the following is the correct
charge for the most stable ion formed by bromine?
1.
|
1+
|
2.
|
1-
|
3.
|
0
|
4.
|
2-
|
Use the periodic table only and arrange
the elements in this set in order of decreasing EN.
Br, Cl, P
Br, Cl, P
a.
|
Cl > P
> Br
|
b.
|
P > Br
> Cl
|
c.
|
Cl > Br > P
|
d.
|
Br > P
> Cl
|
e.
|
none of
these
|
Which order is correct for decreasing
polarity (most polar first)?
F-O, F-F, F-Cl, F-C
(a) F-F > F-O > F-Cl > F-C
(b) F-F > F-C> F-F > F-O
(c) F-C > F-F > F-O > F-Cl
(d) F-C > F-O > F-Cl > F-F
(e) F-C > F-Cl > F-O > F-F
Which molecule exhibits RESONANCE?
a.
|
BeCl2
|
b.
|
O3
|
c.
|
H2Se
|
d.
|
NF3
|
e.
|
CO2
|
The fact that the BF3 molecule
is planar means that the B atom is
a.
|
unhybridized.
|
b.
|
sp3-hybridized.
|
c.
|
sp2-hybridized.
|
d.
|
sp-hybridized.
|
e.
|
involved
in resonance.
|
How many pairs of electrons are there around the central atom in the Lewis structure of the following species? SeF4
a.
|
2
|
b.
|
3
|
c.
|
4
|
d.
|
5
|
e.
|
6
|
The molecular geometry of the SiH2Cl2 molecule
is approximately __________.
a.
|
trigonal
planar
|
b.
|
tetrahedral
|
c.
|
trigonal
pyramidal
|
d.
|
square
planar
|
e.
|
T-shaped
|
Choose the correct Lewis structure for the ion.
PH4+
PH4+
a.
|
[ | ]
[ H-P-H ]
[ || ]
[ H ]
|
b.
|
[ | ]
[ H-P-H ]
[ | ]
[ H ]
|
c.
|
[ H ] +
[ | ]
[ :H-P-H: ]
[ | ]
[ H ]
¨
|
d.
|
[H-H-P-H-H]
˙˙
|
e.
|
How many pi bonds are there in a BF3 molecule?
a.
|
0
|
b.
|
1
|
c.
|
2
|
d.
|
3
|
e.
|
none of
these
|
The rubidium cation has a charge of:
1.
|
2+
|
2.
|
1-
|
3.
|
3+
|
4.
|
1+
|
Which one of the following is most
likely to be an ionic compound?
a.
|
HNF2
|
b.
|
H2CO
|
c.
|
N2H4
|
d.
|
CaCl2
|
e.
|
CO
|
Which of the following orders of
electronegativity is incorrect?
a.
|
Si < P
< N
|
b.
|
Se < S
< O
|
c.
|
I < Cl
< F
|
d.
|
N < P < S
|
e.
|
Si < N
< O
|
Which order is correct for increasing
polarity (least polar first)?
C—C C—Cl C—F C—I
A B
C D
a.
|
A < D
< C < B
|
b.
|
D < C
< B < A
|
c.
|
C < B
< A < D
|
d.
|
A < D < B < C
|
e.
|
A < B
< C < D
|
How many lone pairs are there on the
central atom in the Lewis dot structure of H2Se?
a.
|
1
|
b.
|
2
|
c.
|
4
|
d.
|
3
|
e.
|
impossible
to tell without more information
|
Match this substance with the
phrase that correctly describes its bonds.
a. ionic
b. nonpolar covalent
c. polar covalent
NO2 (Enter just the letter)____________
a. ionic
b. nonpolar covalent
c. polar covalent
NO2 (Enter just the letter)____________
Which of the following bonds is best
described as polar covalent?
a.
|
Cs-Cl
|
b.
|
Cl-Cl
|
c.
|
Br-I
|
d.
|
C-Cl
|
e.
|
none of
these
|
Match the substance with the
phrase that correctly describes its bonds.
a. ionic
b. nonpolar covalent
c. polar covalent
KCl (Enter just the letter)_________________
a. ionic
b. nonpolar covalent
c. polar covalent
KCl (Enter just the letter)_________________
a.
|
COS
|
b.
|
H2O
|
c.
|
HCl
|
d.
|
NF3
|
e.
|
XeF2
|
Match the substance with the
phrase that correctly describes its bonds.
a. ionic
b. nonpolar covalent
c. polar covalent
BF3 (Enter just the letter)_____________
a. ionic
b. nonpolar covalent
c. polar covalent
BF3 (Enter just the letter)_____________
Consider the hydronium ion. According
to VSEPR, which of these best describes the shape of the ion?
1.
|
trigonal
planar
|
2.
|
trigonal pyramidal
|
3.
|
square
planar
|
4.
|
octahedral
|
5.
|
tetrahedral
|
6.
|
t-shaped
|
How many Π (pi) bonds are there in the
N2 bond?
a.
|
1
|
b.
|
2
|
c.
|
3
|
d.
|
4
|
e.
|
0
|
Which of the following
molecules is non-polar?
1.
|
C2H5OH
|
2.
|
O3
|
3.
|
SO3
|
4.
|
SO2
|
5.
|
H2O
|
Halogens form anions known as halides
that are larger than the neutral atom.
1.
|
True
|
2.
|
False
|
Which of the following elements is the
least electronegative?
a.
|
Te
|
b.
|
Rb
|
c.
|
Al
|
d.
|
Cl
|
e.
|
Mg
|
Which of the following elements, when
combined with fluorine, would produce the most nonpolar covalent bond?
a.
|
C
|
b.
|
N
|
c.
|
Fr
|
d.
|
Be
|
e.
|
Ru
|
Which of the following electron
configurations belongs to an atom that is most likely to be involved in a
covalent bond?
1.
|
1s22s22p63s23p6
|
2.
|
1s22s22p63s2
|
3.
|
1s22s22p63s23p3
|
4.
|
1s22s22p6
|
Which series correctly identifies the
hybridization of the central atom in the following species?
O
||
Br-C(tri bnd)N
ClCCl O=C=O
a.
|
sp
sp2 sp
|
b.
|
sp2 sp2 sp2
|
c.
|
sp3 sp2 sp
|
d.
|
sp2 sp2 sp
|
e.
|
sp sp2 sp2
|
Consider BH41- ion.
Using VSEPR, which of these best describes the shape of the ion?
1.
|
square
planar
|
2.
|
t-shaped
|
3.
|
tetrahedral
|
4.
|
octahedral
|
5.
|
see-saw
|
6.
|
square
pyramidal
|
The hybrid orbitals used by each carbon
in are
a.
|
sp
|
b.
|
sp2
|
c.
|
sp3
|
d.
|
sp3d
|
e.
|
sp3d2
|
Which of the following molecules is
most polar?
1.
|
NH3
|
2.
|
HF
|
3.
|
H2O
|
4.
|
C2H6
|
5.
|
CO2
|
Covalent bonds involve:
1.
|
a
cationic re-arrangement of atoms
|
2.
|
a significant electron density between
two nuclei
|
3.
|
the
transport of electrons from one atom to another
|
4.
|
mostly
alkali metal-halide interactions
|
Use the periodic table only and arrange
the elements in this set in order of decreasing EN.
Br, Cl, P
Br, Cl, P
a.
|
Cl > P
> Br
|
b.
|
P > Br
> Cl
|
c.
|
Cl > Br > P
|
d.
|
Br > P
> Cl
|
e.
|
none of
these
|
If one s orbital and two p orbitals
combine to form a new set of hybrid orbitals, what is the result?
a.
|
|
b.
|
|
c.
|
|
d.
|
|
e.
|
How many resonance forms are required
to represent the bicarbonate ion HOCO21-?
a.
|
1
|
b.
|
2
|
c.
|
3
|
d.
|
4
|
e.
|
more than
4
|
Which hybridization best characterizes
the Ge atom involved in a GeH4 molecule?
1.
|
sp2
|
2.
|
sp
|
3.
|
sp4
|
4.
|
sp3
|
Consider SF4. Using VSEPR, which
of these best describes the shape of the molecule?
1.
|
t-shaped
|
2.
|
square
pyramidal
|
3.
|
octahedral
|
4.
|
see-saw
|
5.
|
square
planar
|
6.
|
tetrahedral
|
What is the maximum number of σ bonds
that can be formed between two atoms?
a.
|
|
b.
|
|
c.
|
|
d.
|
|
e.
|
Which of the following molecules would
be polar?
a.
|
|
b.
|
|
c.
|
|
d.
|
|
e.
|
Widely separated atoms do not interact,
but will reach an optimal separation distance called the bond distance and form
a bond.
1.
|
|
2.
|
For single bonds between similar types
of atoms, the strength of the covalent bond is generally directly proportional
to the size of the bonded atoms.
a.
|
|
b.
|
Electronegativity and ionization energy
are inversely related.
a.
|
|
b.
|
Which is the least polar bond?
a.
|
|
b.
|
|
c.
|
|
d.
|
|
e.
|
Draw the Lewis Dot diagram of
nitrate ion. How many resonance forms are possible?
1.
|
|
2.
|
|
3.
|
|
4.
|
Consider the ammonium ion.
According to VSEPR, which of these best describes the shape of the ion?
1.
|
|
2.
|
|
3.
|
|
4.
|
|
5.
|
|
6.
|
Which of the following molecules
would be polar?
a.
|
|
b.
|
|
c.
|
|
d.
|
|
e.
|
In a phosphorus-chlorine bond,
the bond is _______ and the _________ atom bears ________ charge.
a.
|
nonpolar, P, no partial
|
b.
|
polar, Cl, a partial positive
|
c.
|
polar, P, a partial negative
|
d.
|
nonpolar, Cl, no partial
|
e.
|
polar, P, a partial
positive
|
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