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Chem Midterm Review
Chem Midterm Review
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1
How many sigma bonds are in SiF4? How many pi bonds?
4,2
2,4
4,0
0,4
2
How many sig figs does 6500 g have?
2
3
4
6
3
How many sigma bonds are in HCN? How many pi bonds?
2,2
0,4
1,3
4,0
4
Which one of the following is NOT a lab safety rule?
do not use cracked glassware
to dilute acid, always pour water into acid
wear goggles at all times
no horseplay
5
How many neutrons does Ti have?
26
24
22
47
6
What is the nomenclature of S2F4?
sulfur fluoride
trisulfur heptafluoride
disulfur tetrafluorine
disulfur tetrafluoride
7
What subatomic particles make up the mass of the atom?
Protons and electrons
Neutrons and protons
Protons and amu
Neutrons and electrons
8
Which of the following is the correct electron dot structure of PBr3?
D
C
A
B
9
What is the nomenclature for ZnCl
2
?
zinc (I) chloride
zinc chloride
zinc (II) chloride
zinc (II) chlorate
10
Which of the following is the correct prefixes for the acronym "king henry died by drinking chocolate milk"?
kilo, heci, deca, base, deci, centi, mili
kilo, hecto, deca, base, deci, centi, mili
kilo, hecto, deci, base, deca, centi, mili
kilo, hecto, deca, deci, centi, mili
11
What is the volume of the liquid in the graduated cylinder?
39 mL
38 L
38.5 mL
38 mL
12
Arrange these elements based on increasing ionization energy. (W, Cl, Se, Pb)
Cl Se Pb W
W Cl Pb Se
Se Pb Cl W
W Pb Se Cl
13
What is the electron configuration of Sr?
1s2 2s2 2p5 3s2 3p6 4s2 3d10 4p6 5s2
1s2 2s2 2p6 3s2 3p6 3d10 4p6 5s2
1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p6 5s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
14
What is the density of a solution with the volume of 328 mL and a mass of 187.9 g.
1.746 g/mL
1.75 g/mL
0.5729 g/L
0.573 g/mL
15
What is the chemical formula of potassium permanganate?
K(MnO4)
K2(MnO4)
K4(MnO4)
K(MnO4)2
16
What is the name fo the lab equipment pictured below?
motar and pestle
flask
graduated cylinder
triple bean balance
17
What is the energy of a photon that has a frequency of 5.2 x 10
46
Hz?
3.4 x 1013 Joules
3.4 x 1013 Hertz
3.4476 x 1013 Hertz
3.4476 x 1013 Joules
18
What is the chemical formula of iron (II) sulfide?
FS
Fe2S
FeS2
FeS
19
What is the wavelength of a photon that has 9.8 x 10
12
Joules of energy?
2.029 x 10-38 meters
1.478 x 1046 Hertz
1.5 x 1046 Hertz
2.0 x 10-38 meters
20
Is a rusting nail a physical or chemical change?
chemical
physical
21
What group number are the alkaline earth metals?
group 13
group 1
group 7
group 2
22
What is the nomenclature of PO5?
phosphorous heptaoxide
phosphorus oxide
monophosphorus pentaoxide
phosphorus pentaoxide
23
2 grams of He = 6.02 x 10
23
atoms of He = 1 mole
True
False
24
How many protons does Ti have?
22
48
47
26
25
What is resonace?
A resonance hybrid structure is the average of all valid structures
A resonance hybrid structure is the double bonds.
A resonance hybrid structure is the diffrence of all valid structures
A resonance hybrid structure is the average of some valid structures
26
The F block is called the transition metals.
True
False
27
What element is represented by the orbital notation listed below?
Fe
Ni
Mn
Co
28
What is empirical formula if there is 15.8% of carbon and 84.2% of sulfur?
CS4
CS2
C2S
CS
29
The first bond is a ___. The subsequent bonds are ____.
sigma, pi
pi , sigma
sigma, sigma
pi, pi
30
If there are 5 electron sites, how many hybrid orbitals do we have?
sp3
sp
sp3d
sp2
31
How many grams are in 6.82 x 10
23
particles of copper (II) hydroxide,
Cu
(
OH
)
2
?
4.2 g
110.54 g
1.10 x 102 g
4.22 x 1045 g
32
A magnesium atom attains a stable electron configuration when it bonds with:
2 Chlorine Atoms
1 Sodium Atom
2 Sodium Atoms
1 Chlorine Atom
33
Physical changes can be described as phase change, substance remains the same, energy transfer, and reversible.
False
True
34
What is the chemical formula of lithium bromide?
LiBr
Li2Br2
LiBr2
Li2Br
35
What is the molecular formula of the compound Mg
3
Si
2
H
3
O
8
? (molecular molar mass = 520.8 g/mol)
Mg6Si4H6O8
Mg3Si2H3O8
Mg6Si4H6O16
Mg12Si8H12O32
36
What is the nomenclature of Ba
3
N
2
?
Barium Nitrate
Boron Nitride
Barium Nitrogen
Barium Nitride
37
How many grams are in 45 moles of CaCl
2
?
5.0 x 103 g
2.466 g
2.5 g
4994.1 g
38
What is the tyndall effect? Do solutions, colloids, or suspensions have the effect?
scattering of light by particles in a solution
scattering of light by particles in a suspension
scattering of light by particles in a colloid
scattering of protons by particles in a suspension
39
How many grams are in 6.8 x 10
19
atoms of HCN?
0.00305 g
3.1 x 10-3 g
1.5 x 1042 g
1.51 g
40
How many valance electrons do elements in blocks d and f have?
1
none
2
3
41
Is this the correct Lewis Dot Structure for Krypton?
False
True
42
How many valance electrons do alkaline earth metals have?
2
3
1
3
43
What is the formula of decaxarbon tetrachloride?
C4Cl10
C10Cl4
CCl4
C2Cl5
44
Convert 0.020 L to scientific notation.
2.0 x 10-3 L
2.0 x 10-1 L
2.0 x 102 L
2.0 x 10-2 L
45
How many sig figs does 0.01450 g have?
6
4
3
none
46
What is molecular geometry if a structure has 3 bonding pairs and 1 lone pair?
trigonal pyramidal
linear
tetrahedral
trigonal planar
47
What particle is responsible for the change of mass in an isotope?
protons
neutrons
electrons
photons
48
Using the symbol below, detemine the number of neutrons that the atom has.
17
20
35
18
49
What is the noble gas configuration of Hg?
[Xe] 6s2 5d10
[Rn] 6s2 4f14 5d10
[Xe] 6s2 4f14 5d10
[Rn] 6s2 5d10
50
Is the statement listed true or false: 0.0015 km = 1.5 m
True
False
51
What is the formula of diarsenic pentasulfide?
As3S5
As2S5
AsS
As5S2
52
Strontium is larger than tin. What reason explains why?
Stronger nuclear charge (Zeff)
More energy levels; greater shielding effect
Weaker nuclear charge (Zeff)
Fewer energy levels; less shielding effect
53
The image below displays the correct Lewis dot structure for Na
2
O.
False
True
54
Arrange these elements based on decreasing electronegativity. (Ar, O, Ca, Ga)
Ar Ca Ga O
O Ga Ca Ar
O Ca Ga Ar
Ar O Ga Ca
55
Which of the following are empirical formulas:
C
2
H
6,
Na
2
S
2
O
3,
C
6
H
6,
H
2
O
2,
KMnO
4,
H
3
PO
4
All of them
C2H6 , C6H6 , H2O2
Na2S2O3 , KMnO4 , H3PO4
C2H6 , KMnO4 , H2O2
56
What is the atomic mass of Sodium - 24?
11
24
13
23
57
An ionic compound is formed when there is a reaction between the elements ...
Na and O
N and O
P and S
K and Ca
58
What is the mass of 4.56 x 10
12
atoms of As?
5.68 x 10-10 atoms As
5.68 x 10-10 g As
3.67 x 1034 g As
5.67 x 10-10 g As
59
Liquid tends to take the shape of the container, with a definite volume, and somewhat close toghether particles.
True
False
60
Is a worm decaying to form 0.05 grams of ammonia gas and nitrogen for the soil an intensive or extensive property.
Intensive
Extensive
61
What is the nomenclature for (NH
4
)
3
(PO
4
)?
Ammonium Phosphate
Nitrogen Phosphorous Oxide
Ammonium Oxide
Ammonium Phosphide
62
What is the avaerge atomic mass of Fe?
55. 884 g
53.878 g
55.845 g
54.678 g
63
Looking at the phase change chart, name the term associated with the A --> C phase change.
vaporization
deposition
sublimation
melting
64
True or false: Ionization energy is described as the tendency to attract
electrons
.
True
False
65
Arrange these elements based on decreasing atomic radius. (Ti, Sn, Fr, As)
Ti Fr Sn As
Fr Ti Sn As
Fr Sn As Ti
As Sn Ti Fr
66
What is the correct unit for volume?
cm
L
m
C
67
What is the molar mass of K(MnO
4
)?
110 g
158.04 g
158 g
110.04 g
68
What is a property of ionic bonds?
insoluble in water
liquid at room temperature
bad conductor of electricity
high melting point
69
Arsenic had a higher electronegativity compared to Bismiuth. What reason explains why?
More energy levels; greater shielding effect
Stronger nuclear charge (Zeff)
Weaker nuclear charge (Zeff)
Fewer energy levels; less shielding effect
70
Gold has lower ionization energy than mercury. What reason explains why?
Stronger nuclear charge (Zeff)
Fewer energy levels; less shielding effect
More energy levels; greater shielding effect
Weaker nuclear charge (Zeff)
71
What subatomic particles are located in orbitals around the nucleus?
photons
protons
electrons
neutrons
72
What is the electron configuration of P?
1s2 2s2 2p6 3s2 3p3
1s2 2s2 2p6 3s2
1s2 2s2 2p6 3p3
1s2 2s2 2p6 3s2 3p4
73
Which of the following are properties of nonmetals?
Lusterous, good conductor, malleable, ductile, reactive, solid
Lusterous, good conductor, malleable, ductile, non reactive, liquid/solid
dull, bad conductor, not malleable, not ductile, non reactive, liquid/gas
dull, bad conductor, not malleable, ductile, reactive, solid
74
How many atoms can be found in 1.78 moles of Polonium?
1.07 x 10 24 atoms of Po
1.07 x 10 24 grams of Po
1.08 x 10 24 atoms of Po
2.98 x 10 -24 atoms of Po
75
How many moles are in 5.4 x 10
19
atoms of K
3
(PO
4
)?
2.5 x 1017 moles
2.54 x 1017 moles
8.97 x 10-5 moles
9.0 x 10-5 moles
76
A heterogenous mixture is uniform throughout and cannot be seperated. (example: salt water)
False
True
77
Which of the following is the correct electron dot structure of HCN?
D
C
A
B
78
What is molecular geometry if a structure has 4 bonding pairs and 0 lone pair?
tetrahedral
trigonal pyramidal
trigonal planar
linear
79
What is the nomenclature of Ca
3
P
2
?
Calcium Phosphide
Calcium Phosphorous
Calcium Phosphate
Carbon Phosphide
80
What is the chemical formula of copper (II) nitrite?
Cu(NO2)2
Cu2(NO2)
Cu2N3
Cu3N2
81
What is luster?
ability to stretch
low reflectivity = shiny
ability to bend
high reflectivity = shiny
82
Looking at the phase change chart, what is the point where the line meet?
critical point
tri point
triple point
vaporization
83
Buoyancy explains why a drop of water falls faster than a drop of maple syrup.
False
True
84
What trend does the blue arrow represent?
none
ionization energy
electronegativity
atomic radius
85
When given or solving for wavelength, what equation should be utilized?
E=hf
E=\frac{hc}{λ}
E=\frac{λ}{hc}
E=hv
