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Chapter 2: Atoms, Molecules, and Ions
Problem Solving Center
Self Quiz 2
Self Quiz 2
This activity contains 20 questions.
When a solution containing 17.0 g silver nitrate is combined with a solution containing 5.8 g sodium chloride, a reaction (silver nitrate + sodium chloride ---> silver chloride + sodium nitrate) occurs and 14.3 g of solid silver chloride is isolated. If the remaining solution is evaporated, how much sodium nitrate is isolated?
8.5 g of sodium nitrate is isolated.
22.8 g of sodium nitrate is isolated.
37.1 g of sodium nitrate is isolated.
2.7 g of sodium nitrate is isolated.
25.5 g of sodium nitrate is isolated.
Five analyses of a particular compound containing carbon and chlorine having 1 part carbon and 11.8 parts chlorine by mass are given below. Which combination is
incorrectly
reported? That is, which one does
not
follow the law of definite proportions for this compound?
8 g carbon and 94.7 g chlorine
18 g carbon and 213 g chlorine
12 g carbon and 142 g chlorine
21 g carbon and 169 g chlorine
30 g carbon and 355 g chlorine
Carbon can combine with hydrogen to form 2 compounds, Compound #1 and Compound #2. Compound #1 consists of 72 g of C and 8 g of H, while Compound #2 consists of 72 g of C and 6 g of H. What is the value of the C:H mass ratio in Compound #1 / C:H mass ratio in Compound #2?
2 / 1 is the mass ratio for Compound #1 and Compound # 2.
1 / 1 is the mass ratio for Compound #1 and Compound # 2.
3 / 4 is the mass ratio for Compound #1 and Compound # 2.
4 / 3 is the mass ratio for Compound #1 and Compound # 2.
14 / 1 is the mass ratio for Compound #1 and Compound # 2.
What was Millikan able to determine as a result of discovering that the charges on oil droplets were whole-number multiples of the charge of a single electron?
Millikan was able to determine only the mass of an electron.
Millikan was able to determine only the charge of the nucleus.
Millikan was able to determine both the charge and mass of an electron.
Millikan was able to determine only the charge of an electron.
Millikan was able to determine only the mass of the nucleus.
What is the mass number of an atom?
The actual mass of an atom is the mass number.
The number of neutrons in an atom is the mass number.
The number of protons + the number of electrons in an atom is the mass number.
The number of protons + the number of neutrons in an atom is the mass number.
The total number of subatomic particles (protons, neutrons, and electrons) in an atom is the mass number.
Iodine-123 is used in thyroid therapy. What is its nuclear symbol?
53
123
I
176
53
I
70
53
I
53
70
I
123
53
I
Which formula correctly calculates the atomic mass of chlorine as it is reported in the periodic table if chlorine has 2 naturally occurring isotopes: chlorine-35 (75.53 % ; isotopic mass = 34.97 amu) and chlorine-37 (24.47 % ; isotopic mass = 36.94 amu)?
(75.53)(34.97 amu) + (24.47)(36.94 amu)
(34.97 amu + 36.94 amu)/2
(34.97 amu)/(75.53) + (36.94 amu)/ (24.47)
(34.97 amu)(100)/(75.53) + (36.94 amu)(100)/(24.47)
(0.7553)(34.97 amu) + (.2447)(36.94 amu)
In most cases the mass of an atom in amu is numerically close to
the number of protons + number of neutrons + number of electrons.
the number of protons + number of neutrons.
the number of protons.
the number of protons + number of electrons.
the number of neutrons.
Which is
not
a correctly written chemical equation?
2Al + 3Cl
2
---> 2AlCl
3
2H
2
+ O
2
---> H
2
O
N
2
+ 2H
2
---> N
2
H
4
2Na + Cl
2
---> 2NaCl
Cu + Br
2
---> CuBr
2
Which sample is
not
correctly matched to its classification?
wine : homogeneous mixture
wood : homogeneous mixture
silicon dioxide : compound
iron : element
soil : heterogeneous mixture
The combination of elements that is most likely to form a covalent bond between atoms of those elements is
Ba-Cu.
C-I.
Cr-Fe.
Co-Cl.
K-Se.
The structural formula of a molecule shows
only the type of atoms in a molecule.
only the relative positions of atoms in a molecule.
only the type and number of atoms in a molecule.
only the number of atoms in a molecule.
the type, number, and connections between atoms in a molecule.
The formula that represents an ionic compound is
OCl
2
.
PF
3
.
OsIr.
ScI
3
.
Br
2
.
Which does
not
represent the interaction of a base with water?
Ca(OH)
2
(
s
) ---> Ca
2+
(
aq
) + 2OH
-
(
aq
)
CsOH(
s
) ---> Cs
+
(
aq
) + OH
-
(
aq
)
LiOH(
s
) ---> Li
+
(
aq
) + OH
-
(
aq
)
CH
3
OH(
l
) ---> CH
3
OH(
aq
)
Ba(OH)
2
(
s
) ---> Ba
2+
(
aq
) + 2OH
-
(
aq
)
The element that is most likely to form a cation with a +2 charge is
Rb.
Ra.
N.
Rn.
Br.
The ion symbol that is given correctly is
Sr
2-
.
Se
2+
.
Sc
3-
.
S
2-
.
Na
-
.
The formula for iron (III) fluoride is
FeF
3
.
IrF
3
.
Fe
3
F.
FeF.
Fe
3
F
3
.
The correct formula for calcium nitride is
Ca
3
N.
Ca
3
N
2
.
CaN.
Ca
2
N
3
.
C
3
N
2
.
The systematic name for PBr
5
is
phosphorus pentabromide.
phosphorus bromide.
phosphorus bromide (V).
phosphorus (V) bromide.
phosphide pentabromide.
The correct formula for the binary compound dinitrogen pentoxide is
N(II)O
5
.
N
2
O
5
.
NO.
N
2
O
5
.
N
5
O
2
.
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