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