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CHEM121 001 Final Test

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1.
Calculate the change internal energy (ΔE) for a system that is giving off 45.0 kJ of heat and is performing 855 J of work on the surroundings.
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2.
A mixture of N2, O2 and Ar have mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N2 if the total pressure of the mixture is 3.9 atm?
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3.
What value of l is represented by a d orbital?
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4.
According to the following reaction, how much energy is required to decompose 55.0 kg of Fe3O4? The molar mass of Fe3O4 is 231.55 g/mol. Fe3O4(s) → 3 Fe(s) + 2 O2(g) ΔH°rxn = +1118 kJ
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5.
A gas is at 35.0°C and 4.50 L. What is the temperature at 9.00 L?
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6.
Calculate the mass (in g) of 1.9 x 1024 atoms of Pb. 

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7.
Identify what a bomb calorimeter measures.
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8.
Choose the thermochemical equation that illustrates ΔH°f for Li2SO4.
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9.
Choose the one set of quantum numbers that does not contain an error. A) 
n = 4, l = 0, ml =-1 B) 
n = 3, l = 1, ml = -2 C) 
n = 5, l = 3, ml =-3 D) 
n = 4, l = 4, ml =0 E) 
n = 3, l = 2, ml =+3
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10.
Give the structure for sodium chlorate.
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11.
Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na2CO3 and HCl are mixed.
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12.
The mass number is equal to?
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13.
A gas occupies 3.33 L at 2.23 atm. What is the volume at 2.50 atm?
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14.
Identify an amine.
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15.
Which of the following processes is endothermic?
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16.
Silver has an atomic mass of 107.868 amu. The Ag-109 isotope (108.905 amu) is 48.16%. What is the amu of the other isotope?
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17.
What is the mass of 9.44 × 1024 molecules of NO2? The molar mass of NO2 is 46.01 g/mol.
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18.
A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.79 g/mL, 1.81 g/mL, 1.80 g/mL, 1.81 g/mL. If the actual value for the density of the sugar solution is 1.80 g/mL, describe her results.
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19.
Identify the correct values for a 3p sublevel.
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20.
Give the formula for sulfurous acid.
A.
343 C
B.
CH3CH2NH2
C.
n = 3, l = 1, ml = 0
D.
2 Li(s) + 1/8 S8(s, rhombic) + 2 O2(g) → Li2SO4(s)
E.
2
F.
0.98 atm
G.

2 H+(aq) + CO32-(aq) → H2O(l) + CO2(g)
H.
721 grams
I.
6.5 × 102 grams
J.
Her results are both precise and accurate.
K.
106.905 amu
L.
C
M.
2.97 L
N.
an atom absorbs a photon
O.

measures ΔE for combustion reactions
P.
NaClO3
Q.
2.66 × 105 kJ
R.
H2SO3
S.
-45.9 kJ
T.

the sum of the number of protons and neutrons.
Type the Answer that corresponds to the displayed Question.
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21.
Determine the velocity of a marble (m = 8.66 g) with a wavelength of 3.46 × 10-33 m.
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22.
True/False: Potential energy is the energy associated with its movement.
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23.

Determine the mass of an object that has a volume of 88.6 mL and a density of 9.77 g/mL.
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24.
Calculate the temperature, in K, of 2.20 moles of gas occupying 3.50 L at 3.30 atm.
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25.
A syringe contains 0.65 moles of He gas that occupy 750.0 mL. What volume (in L) of gas will the syringe hold if 0.35 moles of Ne is added?
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26.
Choose the pure substance from the list below. 
air, 

sea water, 
milk, sugar, 
lemonade
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27.

If a solution has a temperature of 355 K, what is its temperature in degrees celsius?
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28.
What is the empirical formula for C4H10O2?
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29.
Write the name for Ca3(PO4)2.
Type the Question that corresponds to the displayed Answer.
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30.
strong electrolyte, strong acid

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