Chem 101 - General Chemistry I » Spring 2021 » Chapter 7 Homework Quiz
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Question #1
Atoms of an element X have the ground-state electron configuration 1s22s22p63s23p4. What type of ion is X most likely to form?
A.
X2–
B.
X3–
C.
X4+
D.
X–
Question #2
Which one of the following has an enthalpy change that is equal to the lattice energy of SrCl2?
A.
SrCl2(s) → Sr(g) + Cl2(g)
B.
SrCl2(s) → Sr(g) + 2Cl(g)
C.
SrCl2(s) → Sr(s) + Cl2(g)
D.
SrCl2(s) → Sr2+(g) + 2Cl-(g)
Question #3
If atom X forms a diatomic molecule with itself, the bond is
A.
ionic
B.
polar covalent
C.
nonpolar covalent
D.
none of these
Question #4
Using bond-energy data, what is ΔH° for the following reaction? CH4(g) + 2F2(g) → CF4(g) + 2H2(g) Bond / Bond Energy (kJ/mol) C-H / 413 H-H / 432 F-F / 159 C-F / 485
A.
1489 kJ
B.
834 kJ
C.
561 kJ
D.
–834 Kj
E.
–561 kJ
Question #5
As the number of bonds between two carbon atoms increases, which of the following decrease(s)?
A.
only the number of electrons between the carbon atoms
B.
none of these
C.
only the bond length
D.
only
E.
the bond length, and the number of electrons between the carbon atoms
Question #6
The number of valence electrons in the propionate ion, CH3CH2COO-, is
A.
32
B.
36
C.
30.
D.
50.
Question #7
The following representation of an atom is called
A.
a Lewis dot structure.
B.
an ion.
C.
an ionic bond.
D.
an electrostatic potential map.
E.
a structural formula.
Question #8
Which one of the following has a Lewis formula most similar to that of NO–?
A.
NO
B.
NO+
C.
O22–
D.
O2
Question #9
In which of the following molecules is the octet rule violated?
A.
ClF
B.
PF3
C.
PF5
D.
OF2
Question #10
All the following statements about resonance are true except
A.
Resonance describes the bonding as intermediate between the contributing resonance formulas.
B.
Resonance describes the oscillation and vibration of electrons.
C.
A single Lewis formula does not provide an adequate representation of the bonding.
D.
Resonance describes a more stable situation than does any one contributing resonance formula.
E.
The contributing resonance formulas differ only in the arrangement of the electrons.
Question #11
In which of the following species is the octet rule violated by the central atom when the central atom has a formal charge of zero?
A.
PF3
B.
SOCl2
C.
At most one of the adults has high blood pressure.
D.
H2S
E.
CCl4
Question #12
In ClF3, the electron pairs are arranged about the chlorine atom in
A.
a trigonal bipyramid.
B.
a square plane.
C.
an octahedron.
D.
a trigonal pyramid.
Question #13
What is the electron geometry (or electron arrangement) around an atom in a molecule or ion which is surrounded by three lone pairs of electrons and one single bond.
A.
linear
B.
trigonal planar
C.
tetrahedral
D.
bent
Question #14
What is the molecular geometry around an atom in a molecule or ion which is surrounded by one lone pair of electrons and three single bonds.
A.
bent
B.
tetrahedral
C.
linear
D.
trigonal pyramidal
Question #15
Which molecule or ion does not have a trigonal pyramidal molecular geometry?
A.
PO33–
B.
XeO3
C.
BF3
D.
NI3
Question #16
Which molecule or ion has the same molecular geometry for its central atom(s) as BF3?
A.
CH3–
B.
C2F6
C.
C2F4
D.
BF4–
Question #17
Which molecule or ion is nonlinear?
A.
NNO
B.
SO2
C.
NO2+
D.
CS2
Question #18
What is the predicted H—N—H bond angle in the ammonium ion?
A.
45°
B.
120°
C.
180°
D.
109.5°
Question #19
The molecular geometry of the nitrite ion, NO2– , is best described as
A.
trigonal pyramidal.
B.
bent.
C.
tetrahedral.
D.
pyramidal.
Question #20
What is the molecular geometry of the ICl4– ion?
A.
octahedral
B.
square planar
C.
tetrahedral
D.
rectangular
Question #21
What is the H—O—H bond angle in water?
A.
180°
B.
slightly less than 109°
C.
120°
D.
90°
Question #22
The measure of the attraction that an atom has for the electrons in a chemical bond is called
A.
resonance energy.
B.
electronegativity.
C.
electron affinity.
D.
ionization energy.
Question #23
Which of the following bonds is the most polar bond?
A.
F—F
B.
Si—F
C.
S—F
D.
C—F
Question #24
Which of the following statements best describes N2O?
A.
The molecular geometry is trigonal planar and the molecule is nonpolar.
B.
The molecular geometry is linear and the molecule is nonpolar.
C.
The molecular geometry is linear and the molecule is polar.
D.
The molecular geometry is bent and the molecule is nonpolar.
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