H
What causes dipole interactions?
bonding of a covalently bonded hydrogen to an unshared electron pair
sharing of electron pairs
attraction between ions
attraction between polar molecules
Question 2
2.5 / 2.5 pts
Which of the following bond types is normally the weakest?
sigma bond formed by the overlap of two p orbitals
pi bond formed by the overlap of two p orbitals
sigma bond formed by the overlap of one s and one p orbital
sigma bond formed by the overlap of two s orbitals
Question 3
2.5 / 2.5 pts
Which of the forces of molecular attraction is the weakest?
dipole interaction
single covalent bond
hydrogen bond
dispersion
Question 4
2.5 / 2.5 pts
What is the molecular polarity of IF5?
Can’t be determined
Nonpolar
Polar
Question 5
2.5 / 2.5 pts
What is the chemical name for the compound P3N5?
Phosphorus(III) nitride
Pentaphosphorus trinitride
Triphosphorus nitride
Triphosphorus pentanitride
Question 6
2.5 / 2.5 pts
According to VSEPR theory, what is the shape of the nitrate ion?
tetrahedral
trigonal pyramidal
trigonal planar
bent
Question 7
2.5 / 2.5 pts
How many pi bonds does the molecule HCN contain?
two
three
one
none
Question 8
2.5 / 2.5 pts
Match the hybridization scheme to the carbon atom in each molecule.
Which pair is incorrect?
sp2; CO2
sp2; H2CO
sp3; CH2Cl2
sp3; CH4
Question 9
2.5 / 2.5 pts
Covalent bonds mainly occur between-
one metallic element and one nonmetallic element
two nonmetallic elements
one metalloid and one metallic element.
two metallic elements
Question 10
2.5 / 2.5 pts
In which of the following compounds is the octet expanded to include 12 electrons?
PCl5
H2S
SF6
PCl3
Question 11
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What type of intermolecular forces are found between CO2 molecules?
dispersion
hydrogen bonding
dipole interaction
covalent bonding
Question 12
2.5 / 2.5 pts
What type of hybrid orbital exists in the methane (CH4) molecule?
sp
sp3
sp2
sp3d2
Question 13
2.5 / 2.5 pts
In which one of the following does the central atom not possess an 'octet' in its outer shell?
NH3
H2O
BH3
CH4
Question 14
2.5 / 2.5 pts
Which of the following is an acceptable Lewis Structure for the diatomic nitrogen molecule?
Question 15
2.5 / 2.5 pts
Which of the diatomic elements has a double bond between its atoms?
oxygen
fluorine
nitrogen
hydrogen
Question 16
2.5 / 2.5 pts
The Lewis dot structure of a compound is shown below.
Which of the following elements does X represent in the structure?
nitrogen (N)
carbon (C)
fluorine (F)
oxygen (O)
Question 17
2.5 / 2.5 pts
What is the shape of a molecule with a triple bond?
linear
pyramidal
tetrahedral
bent
Question 18
2.5 / 2.5 pts
The molecule CF4
contains polar covalent bonds and is a polar molecule
contains non-polar covalent bonds and is a non-polar molecule
contains non-polar covalent bonds but is a polar molecule
contains polar covalent bonds but is a non-polar molecule
Question 19
2.5 / 2.5 pts
Determine the total number of sigma and pi bonds in the following molecular structure.
H - C º C - C = C - C º C- C º N:
ç ç
H H
12 sigma , 5 p
10 sigma , 7 p
7 sigma, 10 p
11 sigma, 7 p
Question 20
2.5 / 2.5 pts
The boiling point of water, H2O, is higher than the boiling point of hydrogen sulfide, H2S, because water molecules are
more polar and form hydrogen bonds.
ionic and form hydrogen bonds.
more covalent and form hydrogen bonds.
less polar and form hydrogen bonds.
Question 21
2.5 / 2.5 pts
Which of the following is the name of the molecule PCl3?
Phosphorus trichloride
Phosphorus chloride
Potassium chloride
Potassium trichloride
Question 22
2.5 / 2.5 pts
Which of the following molecules is non-polar?
BCl3
NH3
PCl3
CH3Cl
Question 23
2.5 / 2.5 pts
What is a lone pair in a Lewis diagram?
A bonding pair of electrons
An unshared pair of electrons
A shared pair of electrons
A molecule with only two electrons
Question 24
2.5 / 2.5 pts
Which of the following molecules is non-polar?
SO2
SO3
SCl2
H2S
Question 25
2.5 / 2.5 pts
What type of hybridization occurs in the orbitals of a carbon atom participating in a triple bond with another carbon atom?
sp3
pd
sp
sp2
Question 26
2.5 / 2.5 pts
Which compound has a covalent bond?
KBr
CaI2
NO
NaCl
Question 27
2.5 / 2.5 pts
How many pi bonds are formed when sp2 hybridization occurs in ethene, C2H4?
2
1
3
0
Question 28
2.5 / 2.5 pts
Which of the following is an acceptable Lewis structure for chloromethane (CH3Cl)?
Question 29
2.5 / 2.5 pts
A molecule in which the central atom has two lone pairs and forms two single bonds is said to have a _____________ shape.
tetrahedral
trigonal planar
bent
trigonal pyramidal
Question 30
2.5 / 2.5 pts
Which elements can form diatomic molecules joined by a single covalent bond?
halogens only
halogens and members of the oxygen group only
hydrogen only
hydrogen and the halogens only
Question 31
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Hydrogen chloride is a covalent compound.
Which is a correct Lewis dot structure for HCl?
Question 32
2.5 / 2.5 pts
What is the central atom’s hybridization for XeF4?
sp3d2
sp3d
sp3
sp3d3
Question 33
2.5 / 2.5 pts
According to VSEPR theory, what is the shape of a molecule of CS2?
bent
linear
tetrahedral
trigonal planar
Question 34
2.5 / 2.5 pts
The correct formula for dinitrogen pentoxide is –
N5O
N2O
NO5
N2O5
Question 35
2.5 / 2.5 pts
The molecule among the following that exhibits resonance structures is
O3
NH3
CO2
CH4
Question 36
2.5 / 2.5 pts
Which bond has the greatest ionic character?
H--Cl
H--N
H--F
H--O
Question 37
2.5 / 2.5 pts
Which of the following molecules is an exception to the octet rule?
CCl4
NCl3
PCl5
COCl2
Question 38
2.5 / 2.5 pts
Which combination of atoms can form a polar covalent bond?
N and N
H and H
H and Br
Na and Br
Question 39
2.5 / 2.5 pts
According to VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as possible?
inner shell electrons
pairs of valence electrons
the electrons closest to the nuclei
mobile electrons
Question 40
2.5 / 2.5 pts
The chemical formula for ammonia is NH3. Which of the following is the correct Lewis electron dot structure for ammonia?