1
Created by Boundless
Which of the following atom pairs include atoms that won't satisfy the octet rule?
A
K and Br
B
K and F
C
Na and Cl
D
Na and H
2
Created by Boundless
Which of the following facts about Lewis structures is FALSE? Lewis structures
_________.
A
only depict valence electrons
B
only depict ionic bonds
C
use lines to show bonding
D
can be used to show elements or molecules
3
Created by Boundless
Which of the following atoms would be shown with 7 electrons in its Lewis
structure?
A
None of these answers
B
beryllium (Be)
C
hydrogen (H)
D
sulfur (S)
4
Created by Boundless
Which of the following statements represents the BEST first step for attempting to
draw a Lewis structure?
A
Form a structure by connecting all the atoms by single
bonds
B
Form octets for each atom
C
Draw Lewis structures of all the individual atoms
D
Make sure the Lewis structure has the correct number of
atoms
5
Created by Boundless
Draw the Lewis structure for nitrate (NO3­). How many lone pairs does it have?
6
A
8
B
2
C
16
D
4
Created by Boundless
The Lewis structure of HCN contains:
A
two single bonds
B
one double bond and one single bond
C
two double bonds
D
one triple bond and one single bond
7
Created by Boundless
Which molecule contains at least one double bond?
A
H2O
B
All of the answers
C
CH3Cl
D
CO2
8
Created by Boundless
Which molecule contains a double bond?
9
A
COCl2
B
None of the answers
C
CF4
D
SF2
Created by Boundless
Which of the following ionic formulas is INCORRECT?
A
MgI2
B
NaF
C
CaCl
D
KBr
10
Created by Boundless
What periodic trend would be most useful in determining the ionic bond character
of a bond?
A
electronegativity
B
melting point
C
ionization energy
D
atomic radius
11
Created by Boundless
Which of the following does NOT accurately describe a feature of ionic bonding?
A
Ionic bonds involve attractive electrostatic forces.
B
Electrons are shared in ionic bonds.
C
Ionic compounds form crystal lattices.
D
Ionic bonds form because of differences in
electronegativity.
12
Created by Boundless
Lattice energies _____________.
A
are determined experimentally by isolating gas­phase
ions
B
are described mathematically by the Carnot cycle
C
are correlated with the charge and radius of the
component ions
D
estimate the strength of covalent bonds
13
Created by Boundless
Which of the following pairs of atoms is likely to form a covalent bond?
A
Li and I
B
Mg and Ca
C
Se and O
D
Rb and Br
14
Created by Boundless
What types of orbitals does the central carbon in acetone, CH2O, use to form
bonds with the hydrogen atoms?
A
sp2
B
sp2 and p
C
sp3
D
sp3 and p
15
Created by Boundless
All of the following physical properties can be explained by the covalent bonding
model EXCEPT:
A
Boiling point
B
Bond length
C
Electronegativity
D
Electrical conductivity
16
Created by Boundless
Which of the following correctly identifies the orbitals and bond types in N2?
17
A
1 sigma bond between sp orbitals AND 2 pi bonds
B
2 sigma bonds between sp orbitals AND 1 pi bond
C
1 sigma bond between sp2 orbitals AND 1 pi bond
D
2 sigma bonds between sp2 orbitals AND 1 pi bonds
Created by Boundless
Which of the following correctly describes the bond in hydrogen gas?
A
1s atomic orbital overlaps with 2s atomic orbital to form a
sigma bond
B
1s atomic orbital overlaps with 1s atomic orbital to form a
pi bond
C
1s atomic orbital overlaps with 1s atomic orbital to form
sigma bond
D
1s atomic orbital overlaps with 2s atomic orbital to form a
pi bond
18
Created by Boundless
Which of the following elements is most likely to participate in the formation of
multiple bonds?
A
Cl
B
S
C
Na
D
H
19
Created by Boundless
Which of the following combinations of two elements is most likely to produce
highly ionic bonds?
A
boron and nitrogen
B
nitrogen and fluorine
C
lithium and fluorine
D
nitrogen and oxygen
20
Created by Boundless
Which of the following combinations of two elements is most likely to produce
covalent bonds?
A
sodium and nitrogen
B
nitrogen and oxygen
C
sodium and fluorine
D
lithium and fluorine
21
Created by Boundless
Which of the following correctly lists the atoms from least to greatest
electronegativity?
A
H < O < Cl < F
B
F < Cl < O < H
C
H < Cl < O < F
D
F < O < Cl < H
22
Created by Boundless
Which of the following correctly orders the compounds based on increasing
oxidation number assigned to oxygen?
A
CO2 < H2O2 < O2 < O2F2
B
CO2 < O2 < H2O2 < O2F2
C
O2 < H2O2 < O2F2 < CO2
D
O2F2 < O2 < CO2 < H2O2
23
Created by Boundless
Which of the following compounds has the smallest dipole moment?
A
HF
B
CO2
C
H2O
D
HCN
24
Created by Boundless
Which property refers to the hypothetical charge that a molecule/compound would
have if all bonds were purely ionic?
25
A
Polarity
B
Oxidation Number
C
Dipole
D
Dipole Moment
Created by Boundless
Which of the following is a chemical property that describes the tendency of an
atom or a functional group to attract electrons (or electron density) toward itself?
A
Polarity
B
Dipole Moment
C
Dipole
D
Electronegativity
26
Created by Boundless
Which of the following is an indicator of the degree of oxidation an atom in a
chemical compound ?
A
Oxidation Number
B
Dipole Moment
C
Polarity
D
Dipole
27
Created by Boundless
Which of the following correctly lists the elements by increasing order of
electronegativity?
A
Mg < Si < C < F
B
Mg < C < Si < F
C
F < C < Si < Mg
D
F < Si < C < Mg
28
Created by Boundless
Which of the following best describes the variation of the electronegativity of the
elements with respect to their position on the periodic table?
A
increases across a period; increases down a group
B
increases across a period; decreases down a group
C
decreases across a period; increases down a group
D
decreases across a period; decreases down a group
29
Created by Boundless
What is the formal charge on boron in BH4?
A
1
B
0
C
­1
D
2
30
Created by Boundless
How many distinct resonance structures can be drawn for [CO3]2­?
A
3
B
0
C
2
D
31
1
Created by Boundless
Nitric oxide violates the octet rule because __________.
A
it forms a double bond instead of a single bond
B
it has more than 8 electrons around the nitrogen atom
C
it has an unpaired electron
D
both its atoms have negative formal charges
32
Created by Boundless
C cannot have an expanded octet because ________.
A
it has no d orbitals
B
Both of these answers
C
it is a second period element
D
Neither of these answers
33
Created by Boundless
Which of the following compounds illustrates a deviation from the octet rule?
A
BF3
B
AlCl3
C
All of these answers
D
H2
34
Created by Boundless
Which of the following elements is most likely to form compounds involving an
expanded valence shell of electrons?
A
O
B
Na
C
P
D
N
35
Created by Boundless
Which of the following correctly orders the C­C bond lengths from shortest to
longest?
36
A
C2H6 < C2H4 < C2H2
B
C2H2 < C2H6 < C2H4
C
C2H4 < C2H6 < C2H2
D
C2H2 < C2H4 < C2H6
Created by Boundless
Bond enthalpy or bond dissociation energy is ______________.
A
a measure of the change in energy upon homolytic
cleavage of a bond
B
positive for exothermic reactions
C
All of these answers
D
negative for endothermic reactions
37
Created by Boundless
Bond energy measures ______________.
A
the strength of a chemical bond
B
the length of a chemical bond
C
the heat of formation of a chemical bond
D
the energy required to put two atoms together