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Unit 02 Review Quiz
Unit 02 Review Quiz
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1
The molecular geometry represented by molecule C below is known as
linear
trigonal pyramidal
bent
tetrahedral
2
Covalent bonds typically form between
semi-conductors and metals
metals and non-metals
non-metals and other non-metals
metals and other metals
3
What is the bond angle in BF
3
?
180o
109.5o
120o
90o
4
The molecular geometry represented by molecule C below is known as
tetrahedral
bent
linear
trigonal pyramidal
5
Which of the following contains metallic bonds?
solid Na
solid NaCl
solid Cl2
none of these
6
When forming an ionic bond...
Two nonmetals will share electrons
Electrons transfer from a nonmetal to a metal
Electrons transfer from a metal to a nonmetal
A metal will share electrons with a nonmetal
7
Which of the following molecules has polar bonds but is a non-polar molecule?
Beryllium dichloride, BeCl2
Fluoromethane, CH3F
Ammonia, NH3
Water, H2O
8
Which of the following atoms is capable of forming more than four covalent bonds?
carbon
neon
nitrogen
phosphorus
9
Which molecule contains a triple bond?
methanal, CH2O
carbon monoxide, CO
sulfur dioxide, SO2
oxygen gas, O2
10
Ozone, O
3
is a unique molecule that forms in the upper atmosphere. The hybridization around the central oxygen atom is
sp3
sp
ozone is not hybridized
sp2
11
The correct molecular geometry and hybridization of ammonium, NH
4
+
is
tetrahedral, sp3
square planar, sp3
tetrahedral, sp2
trigonal pyramidal, sp3
12
Which set of atoms, when bonded together, would form a bond with the
greatest covalent character
?
potassium and oxygen
nitrogen and oxygen
magnesium and oxygen
carbon and oxygen
13
Which compound would be expected to have the strongest ionic bonds?
lithium iodide
lithium chloride
lithium fluoride
lithium bromide
14
Molecules with a molecular dipole will
always
be
polar
.
False
True
15
Which of the following is true regarding the bond lengths in Ozone, O
3
?
There are two equal bond lengths that are equal to an O=O double bond.
There are two equal bond lengths that are equal to an O-O single bond.
There are two lengths, a longer O-O single bond & shorter O=O double bond.
There are two equal bond lengths, between a O-O single and O=O double bond
16
Most non-metals typically form bonds with other non-metals in order to
completely fill their valence energy level.
become positively charged cations.
completely empty their valence energy level.
become negatively charged anions.
17
Based upon the number of valence electrons that element "X" has, how many covalent bonds will it form?
2
4
6
1
18
The bond that forms between atoms with very different electronegativities is a(n)
metallic bond
ionic bond
polar-covalent bond
covalent bond
19
A molecule contains two atoms covalently bonded & has a linear molecular geometry. All atoms are different elements.
This molecule is polar .
This molecule is non-polar.
More information is required.
The molecule is ionic.
20
The molecular geometry of ammonia, NH
3
is shown below. (EN: N = 3.0, H = 2.1)
Ammonia is a non-polar molecule with a molecular dipole.
Ammonia is a polar molecule with a molecular dipole.
Ammonia is a non-polar molecule with no molecular dipole.
Ammonia is a polar molecule with no molecular dipole.
21
Covalent bonds differ from ionic bonds in that
covalent bonds and ionic bonds are exactly the same, actually.
covalent bonds involve electrostatic attractions between ions.
covalent bonds involve the sharing of electrons between atoms.
covalent bonds involve the transfer of electrons and formation of ions.
22
Which element forms dative bonds when it is the central atom in a covalent compound?
nitrogen
boron
none of these
hydrogen
23
What is the bond angle in CO
2
?
120o
90o
109.5o
180o
24
Most non-metals typically form bonds with other non-metals in order to
completely fill their valence energy level.
completely empty their valence energy level.
become negatively charged anions.
become positively charged cations.
25
Which of the following represents a
trigonal pyramidal
molecular geometry?
E
A
B
C
26
The primary thing that determines if a bond will be covalent, polar covalent, or ionic is
the difference in electronegativities of the bonded atoms.
the relative atomic masses of the bonded atoms.
the ionization energies of the bonded atoms.
the atomic radii of the bonded atoms.
27
The correct Lewis dot structure for OF
2
is shown below. What is the molecular geometry of OF
2
?
Tetrahedral
Linear
Bent
Trigonal Pyramidal
28
Covalent bonds typically form between
semi-conductors and metals
non-metals and other non-metals
metals and non-metals
metals and other metals
29
The chemical formula of the covalent compound that would form between "X" and hydrogen would be
HX2
H2X
H6X
HX
30
What type of alloy is made when the radii of the atoms are similar in size?
ionic
covalent network
substitutional
interstitial
31
Breaking bonds is
Isothermic
Endothermic
Exothermic
Fun
32
The type of chemical bond that forms between atoms with very different electronegativities will most likely be
an ionic bond
a non-polar covalent bond
a polar covalent bond
a metallic bond
33
Forming bonds is
Endothermic
Isothermic
Exothermic
Fun
34
Covalent bonds differ from ionic bonds in that
covalent bonds and ionic bonds are exactly the same, actually.
covalent bonds involve the sharing of electrons between atoms.
covalent bonds involve electrostatic attractions between ions.
covalent bonds involve the transfer of electrons and formation of ions.
35
The structural formulas for three molecules with accompanying bond dipoles are shown below. How many are
polar
?
All three molecules are polar.
One of the three molecules is polar.
Two of the three molecules are polar.
None of the molecules are polar.
36
Which element will typically form covalent compounds with two lone pairs when it is the central atom?
oxygen
hydrogen
carbon
nitrogen
37
Which molecule below would contain multiple bonds?
chlorine gas
nitrogen gas
iodine gas
hydrogen gas
38
Most non-metals form covalent bonds so that they have a completely filled valence shell. Based upon this,
oxygen would typically form one bond, as it needs two additional electrons
oxygen would typically form two bonds, as it needs two additional electrons
oxygen would typically form two bonds, as it needs one additional electron
none of these are correct.
39
Fluorine will form the
most polar
bond when covalently bonded to
Oxygen
Fluorine
Hydrogen
Carbon
40
If you had to approximate the bond angle in ozone, O
3
, it would be closest to
104.5
180
120
109.5
41
Which of the following is the
most polar
?
B
C
D
A
42
Which ionic compound below has the most covalent character?
aluminum chloride
sodium chloride
lithium chloride
magnesium chloride
43
When metals form bonds with non-metals, an ionic bond will always form.
False
True
44
Which is true of any covalent double bond?
it is composed of one sigma and two pi bonds
it is composed of one sigma bond.
it is composed of one sigma and one pi bond.
it is composed of two pi bonds.
45
What is the approximate bond angle in H
2
O?
180o
90o
120o
109.5o
46
Molecules with bond dipoles with
always
be
polar
.
True
False
