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Chem 2045 practice exam
Chem 2045 practice exam
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1
The H2O, NH3, HCI, O3 formulas represent?
mixtures
compounds
molecules
elements
2
Which atom is most likely to form a 1- ion?
P
i
Ag
S
3
What is the correct name for NH4CIO4?
ammonia hydrogen perchlorate
ammonia hydrogen chlorate
ammonium hypochlorite
ammonium perchlorate
4
*REFER TO IMAGE TO ANSWER THE QUESTION*
An element
A compound
A metal
A mixture
5
All of the following compounds are insoluble in water except ____
Fe(OH)3
PbF2
Ni(ClO4)2
ВаСОз
6
What is the correct name for PF5?
phosphorus pentafluoride
phosphorus pentafluorine
phosphorus(V) fluoride
phosphorus fluorate
7
What is the correct name for SO2?
sulfuric dioxide
sulfur dioxide
sulfur oxide
sulfuric acid
8
A pure substance composed of only one type of atom is ?
a compound
a molecule
an element
an atomic cluster
9
A precipitate will form when aqueous Pb(NO3)2 is added to an aqueous solution of ________
Cu(NO3)2
NaCH3 CO2
Pb(CIO4)2
Nal
10
Which atom is most likely to form a 3+ ion?
Fe
Sr
Kr
Li
11
What is the electron configuration of the ground state of chlorine?
1s^2 2s^2 2p^6 3s^2 2p^5 4s^2 3d^5
1s^2 2s^2 2p^6 3s2^2 p^3
1s^2 2s^2 2p^5
1s^2 2s^2 2p^6 3s^2 3p^5
12
Sulfuric acid is the product of the reaction of _____ and H2O
SO3
S8
SO2
H2S
13
What is the charge on the lead ion in PbS2?
2-
4-
0
4+
14
Which of the following compounds is a weak acid?
HCI
HNO3
H3 PO4
HCIO4
15
What is the name of the element with the symbol Mn?
Molibdenum
Magnesium
Medvelevium
Manganese
16
Most of the mass of an atom is found in?
All of them
50% electrons 50% protons neutrons
It's electrons
It's nucleus
17
Identify the ions present in KHCO3.
K^+, H^+, C^4+, and 0^2-
KH^+, and CO3^-
K^+ and HCO3^-
KHCO3 is not ionic.
18
What is the correct formula for barium nitrate?
Ba(NO3)2
Ba(NO2)2
BNO2
BaN
19
What is the symbol for chromiun?
Co
Cr
Cd
Ca
20
What is the correct formula for an ionic compound that contains aluminum ions and carbonate ions?
AlCO3
Al2(CO3)3
Al(CO3)3
Al(CO3)2
21
Which of the following compounds are soluble in water: K2CO3, CaCO3, NiCO3, and Fe2(CO3)3?
NiCO3and Fe2(CO3)з
CaCO3and NiCO3
K2СОз only
K2CO3 and CaCO3
22
If Lavoiser's law of conservation of mass were violated, then
Mass could disappear into nothing
All of them
matter could be created out of nothing
the amount of material in the universe would be changing
23
An aluminum ion has _________ electrons.
9
12
13
10
24
Which of the following is an extensive property?
melting point
volume
density
boiling point
25
*REFER TO IMAGE TO ANSWER THE QUESTION*
9g/mL, pure gold
11g/mL, impure gold
9g/mL, impure gold
19.3 g/mL, pure gold
26
Choose the pair that has the same number of neutrons
64/28Ni and 63/29Cu
64/28Ni and 32/16S
64/30Zn and 32/16S
64/30Zn and 63/29Cu
27
Which of the following elements has the highest atomic number?
144^Nd
138^Ba
226^Ra
231^Pa
28
The boiling point of liquid helium is 4 K. What is this temperature in Celsius?
-294 °c
-277 °c
-269 °c
-255 °c
29
Convert 100° Celsius into Kelvin
+30.5K
290 K
-173.15 K
+373.15 K
30
What is the correct formula for cobalt(III) oxide?
Co3O
Co2O3
Co3O2
CoO
31
You have 0.330 mole of each of the following elements: Be, B, Br, Ba, and Bi. Which sample has the largest mass?
B
Be
Br
Bi
32
*REFER TO IMAGE TO ANSWER THE QUESTION*
114.8 u
113.9 u
113.0 u
113.8 u
33
Which statement is always correct ?
an element is made of molecules
all compounds are molecules
all molecules are compounds
a molecule is a compound
34
All of the following are named correctly EXCEPT
NaCN; sodium cyanide.
CaHPO4; calcium hydrogen phosphide.
Mg(OH)2; magnesium hydroxide.
LiCIO4; lithium perchlorate.
35
*REFER TO IMAGE TO ANSWER THE QUESTION*
150
90
178.2
200.5
36
What is the correct formula for an ionic compound that contains magnesium ions and fluoride ions?
MgF
Mg2F2
Mg2F
MgF2
37
What is the mass of 5.1 mol P?
6.1 g
1.6 x 10^2 g
1.6 x 10^-1 g
6.3 x 10^-3
38
*REFER TO IMAGE TO ANSWER THE QUESTION*
1, 3, 1, 3
1, 3, 3, 1
1, 1, 1, 1
1, 5, 3, 4
39
A molecule is found to contain 47.35% C, 10.60% H, and 42.05% O. What is the empirical formula for thismolecule?
C3H4O2
C2H6O
C3H8O2
C4H6O2
40
How many elements are in the first period of the periodic table?
8
10
7
2
41
*REFER TO IMAGE TO ANSWER THE QUESTION*
1, 6, 4
1, 3, 1
2, 4, 1
1, 1, 1
42
Which species is reduced in the reaction below?
H2O
ClO^-
i ^-
Cl^-
43
The density of acetic acid is 1.05 g/mL. What is the volume of 327 g of acetic acid?
2.91 x 10^-3 mL
2.62 × 10^2 mL
3.11 × 10^2 mL
3.21 × 10^-3 mL
44
The lowest possible temperature in the universe is?
-100°c
0 °K
there is not a limit
-273.15 °k
45
What is the net ionic equation for the reaction of aqueous hydrochloric acid and aqueous potassiumhydroxide?
H^+(aq) + OH^-(aq) -> H2O
HCI(aq) + OH^- (aq) -> H2O + CI^-(aq)
CI^-(aq) + K^+ (aq) -› KCI(s)
HCI(aq) + KOH(aq) -> KCI(aq) + H2O
46
*REFER TO IMAGE TO ANSWER THE QUESTION*
3 and 4
2 only
1 and 2
1 only
47
Which of the following statements is/are CORRECT?
3 only
2 only
1 only
1 and 2 only
48
What is the molar mass of ammonium sulfate?
144.6 g/mol
114.1 g/mol
110.0 g/mol
132.1 g/mol
49
Which of these elements is the heaviest?
Gold
bromine
radon
lead
50
Hydrogen peroxide, H2O2, is not?
a mixture of hydrogen and oxygen
made of molecules
the result of a chemical reaction
a compound of hydrogen and oxygen
51
What is the charge on the copper ion in Cu2O?
1+
2-
1-
2+
52
What are the spectator ions in the reaction between aqueous hydrobromic acid and aqueous sodiumhydroxide?
Na^+ only
Br^- only
H^+ and OH^-
Na^+ and Br^-
53
The kinetic molecular theory of matter for solids requires that
vibrate taking up a large volume
particles in a solid packed tightly in a rigid lattice.
expand to fill all the volume of their container.
are packed closely together but not so close to
54
What is the oxidation number of each atom in sodium hydrogen carbonate, NaHCO3?
Na = +1, H=-1, C = +2, O= -2
Na = +1, H = +1, C = +4, O= -2
Na = +1, H= -1, C = +6, O= -2
Na = -1, H= +1, C = 0, O= -2
55
How many moles of ozone can be made from 160 g of oxygen?
3.3
2
2.5
5.1
56
All of the following are examples of physical properties EXCEPT
the frying of an egg.
idk
the boiling point of ethanol.
the conductivity of aluminum wire.
57
What is the empirical formula for an oxide that contains 46.68% nitrogen?
N2O3
NO2
N20
NO
58
What is the nuclear symbol for an element with 30 protons and 34 neutrons?
64/30Zn
59/31Ga
59/28Ni
32/16S
59
Which of these elements is the less dense?
radon
bromine
lead
Gold
60
Calculate the number of moles in 39 g silicon.
9.1 x 10^-4 mol
11 mol
0.72 mol
1.4 mol
61
*REFER TO IMAGE TO ANSWER THE QUESTION*
140g of nitrogen
5g of hydrogen
100g of water
25g of oxygen
62
What is the correct name for CCl4?
carbon tetrachloride
carbon(IV) chloride
tetracarbon chloride
carbon chlorine
63
How many grams represent 625 mg?
6.25 x 10^-1 g
625,000
62.5 g
6.25 g
64
What alkali metal is in the fourth period?
Ca
K
Sr
Na
65
Metal oxides react with water to produce ______
hydrogen gas
oxygen gas
bases
acids
66
How many grams are in 0.0751 mol Br2?
4.70 x 10^-4 g
0.0833 g
12.0 g
2.13 g
67
Rank the subatomic particles from lowest to highest mass.
electrons = protons < neutrons
electrons < neutrons < protons
neutrons < electrons < protons
electrons < protons < neutrons
68
If new elements were to be discovered, they will be found in this part of the periodic table?
at the end of the table
at the beginning
in the center only
anywhere
69
A pure substance made of two or more different types atoms is called?
a molecule
a mixture
an atom
a compoound
70
What is the mass percent of each element in dichloromethane, CH2Cl2?
24.10% C, 3.11% H, 72.79% CI
20.00% C, 20.00% H, 60.00% CI
10.06% C, 60.24% H, 29.70% CI
14.14% C, 2.37% H, 83.48% Cl
71
*REFER TO IMAGE TO ANSWER THE QUESTION*
titanium, 4.54 g/cm^3
aluminum, 2.70 g/cm^3
nickel, 8.90 g/cm^3
zirconium, 6.51 g/cm^3
72
All of the following are oxidation-reduction reactions EXCEPT
2 Na(s) + Br2(g) -> 2 NaBr(g)
2 C(s) + O2(g) -> 2 CO(g)
Fe(s) + 2 HCI(aq) -> FeCl2(aq) + H2(g)
CaCO3(s) -> CaO(s) + CO2(g)
73
What is the correct name for N2O4?
nitrogen tetraoxide
nitrogen(II) oxide
nitrogen oxide
dinitrogen tetraoxide
74
For a nonmetal in Group 5A of the periodic table, the most common monatomic ion will have a charge of
2-
1+
3-
1-
75
Which pairs of the following are isotopes?
64/30Zn and 63/29Cu
64/30Zn and 68/30Zn
64/28Ni and 63/29Cu
64/28Ni and 32/16S
76
Sugar dissolved in water is an example of?
a two component mixture
a homogeneous mixture
a solution
all of them
