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Chem 121 midterm review Flashcards | StudBud
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Chem 121 midterm review
Chem 121 midterm review
20 terms
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Flashcards
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Practice quiz
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Questions
20
Answers
1
The quantum number m
s
can be 0.
True
False
2
Calculate the energy of light emitted when a photon goes from n=4 to n=6 energy level.
ฮ๐ธ= 7.57 x 10-18 J
ฮ๐ธ= 7.57 x 1020 J
ฮ๐ธ= 7.57 x 10-20 J
not enough information
3
Calculate the mass in grams of 9.12 x 10
54
molecules of CO
2
not enough information
6.67 x 1032 g
1.51 x 1031 g
6.67 x 10-32 g
4
At 273 K and 1 atm, 987 g of gas has a volume of 168.4 L: Find the molar mass of the gas.
6.88 moles
not enough information
131.42 g/mol
6.88 g/mol
5
Calculate the number of moles of 1.5 x 10
14
atoms of He
9.04 x 10-10 mol
4.51 x 10โ12 mol
2.49 x 10-10 mol
1.23 x 10โ12 mol
6
The wavelength of a lightwave is 300 nm, what is its frequency?
3.0 x 102 s-1
1.0 x 1012 Hz
1.0 x 1015 s-1
1.0 x 102 s-1
7
The atomic number is the same for all isotopes of an element but the mass number changes.
Sometimes True
False
True
not enough information
8
Which of the following is
NOT
a principle of Kinetic Molecular Theory?
collisions are elastic ( no loss of energy )
gas particles are in constant motion, and travel in a straight line.
pressure comes from collisions with the wall
kinetic energy depends on pressure and temperature
9
Select the correct electron configuration and core charge for Xe
[Kr] 5s24d105p6 ; Core charge +8
not enough information
[Kr] 5s24d105p6 ; Core Charge: +36
[Kr] 5s24d105p6 ; Core Charge: +18
10
Calculate the volume of Ideal Gas when 12.5 mol of Cl
2
is stored in a vessel at 64 atm at 298 K.
not enough information
0.477 L
4.78 L
4.58 L
11
For an element in isotopic notation, A represents atomic number, Z represents mass number, and X is element
too much information
not enough information
False
True
12
For an electron in an atom with n=4 and l=2, list the possible values for
m
l
โ2,โ1,0,1,2
โ3,โ2,โ1,0,1,2,3
โ1,0,1
-2,-1, 1, 2
13
Calculate the energy of a photon with a frequency of 6.50ร10
14
s
-1
4.31 x 10-19 J
3.96x 10-18 J
4.11 x 10-19 J
4.56 x10-19 J
14
Place the following elements in order of increasing radius and ionization energy:
Se, Cl, Br, S
Radius: S < Se < Cl < Br, Ionization Energy: S < Se < Cl < Br
Radius: Cl < S < Br < Se, Ionization Energy: Se < Br < S < Cl
Radius: S < Cl < Br < Se, Ionization Energy: S < Cl < Br < Se
Radius: Cl < S < Br < Se, Ionization Energy: Se < Br < S < Cl
15
Calculate the number of moles present in 12 g of NaCl
0.256 moles
4.87 mol
0.160 moles
0.21 moles
16
Cl has 2 isotopes Cl
35
and Cl
37
Avg
amu
of Cl is
35.45
. Cl
35
is 34.97 amu while Cl
37
is 36.96 amu. % abundance?
53.5% Cl35 and 46.5% Cl37
75.76% Cl35 and 24.24% Cl37.
24.24% Cl35 and 75.76% Cl37
not enough information.
17
Calculate the number of atoms in 12 g of SO
3
9.03 x 1022 atoms
1.99 x 10-23 atoms
not enough information
5.02 x 1022 atoms
18
Calculate the molar mass (g/mol) of C
20
H
30
O
not enough information
286 g/mol
302 g/mol
258 g/mol
19
Calculate the wavelength (nm) of light emitted when a photon goes from n=4 to n=6 energy level.
2626 nm
2.63 x 10-6 nm
1.67 x 10-52 nm
2.63 x 10-6 m
20
Suppose a sample of gas is compressed (volume reduced) what will happen to the pressure of that gas?
The pressure will decrease cuz collisions with the wall are less frequent.
The pressure will increase cuz collisions with the wall are more frequent
not enough information
The pressure will not change.
