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Which one of the following is most likely to be an ionic compound?
A)
HNF2
B)
H2CO
C)
N2H4
D)
CaCl2
E)
CH3Cl
The number of electron dots in the Lewis symbol for an element equals the
A)
number of outermost p electrons.
B)
number of electrons needed to fill the outermost p orbital.
C)
period number that contains the element.
D)
number of outermost s and p electrons.
E)
number of outermost s electrons.
Which of the following is the correct formula for rubidium oxide?
A)
RbO
B)
RbO2
C)
Rb2O
D)
Rb2O3
E)
Rb3O2
In which of the following processes does the enthalpy change (ΔH) directly represent the magnitude of the lattice energy of KCl(s)?
A)
Cl2(g) + 2K(s) → 2KC (s)
B)
KCl(s) → K+(aq) + Cl- (aq)
C)
KCl(s) → K+(g) + Cl-(g)
D)
KCl(s) → K(s) + Cl-(g)
E)
KCl(s) → K(s) + Cl(g)
Which of the following lists has the four compounds in order of increasing lattice energy?
A)
KF, KCl, KBr, KI
B)
KI, KBr, KCl, KF
C)
KF, KBr, KF, KCl
D)
KBr, KCl, KF, KI
E)
KI, KF, KCl, KBr
Based on lattice energies, which of the following ionic solids would be expected to have the highest melting point?
A)
KF
B)
KCl
C)
KI
D)
RbF
E)
RbI
Which of the following ions has an unusual or incorrect charge?
A)
Te2-
B)
Ba2+
C)
Rb1+
D)
P3+
E)
Al3+
Which of the following diatomic molecules has the shortest bond length?
A)
N2
B)
O2
C)
F2
D)
Cl2
E)
Br2
Order the following by increasing bond strength: N≡N, N=N, N-N
A)
N≡N, N=N, N-N
B)
N≡N, N-N, N=N
C)
N-N, N=N, N≡N
D)
N=N, N-N, N≡N
E)
N=N, N≡N, N-N
Which of the following lists has the bonds ordered from shortest to longest?
A)
C-Cl, C-I, C-F, C-Br
B)
C-Br, C-Cl, C-F, C-I
C)
C-F, C-Cl, C-Br, C-I
D)
C-I, C-Br, C-Cl, C-F
E)
C-I, C-Cl, C-Br, C-F
Which of the following elements is the most electronegative?
A)
Al
B)
As
C)
Ge
D)
P
E)
Cs
Which of the following compounds has the greatest bond polarity?
A)
PH3
B)
NH3
C)
HF
D)
H2S
E)
CH4
Consider an isolated N-C bond in an organic compound. Based on the electronegativities of the two elements, which of the following best describes the net charge on the carbon atom?
A)
no polarization of the bond, i.e. no net charge
B)
a full negative charge
C)
a full positive charge
D)
a partial negative charge
E)
a partial positive charge
Which of the following bonds has the least percent ionic character?
A)
C-H
B)
Na-I
C)
H-F
D)
K-F
E)
Li-Cl
Which of the following best describes the bonding in metals?
A)
Electrons are transferred from one atom to another, producing charges which then interact with each other.
B)
Adjacent atoms share pairs of electrons.
C)
The atomic nuclei fuse to produce a continuous malleable array.
D)
The valence electrons of a each metal atom are delocalized over all of the atoms in the piece of metal.
E)
The protons, neutrons and electrons are pooled to form a homogeneous mass.
