Chem 065 - Introductory General Chemistry » Winter 2024 » Exam 2
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Question #1
Which of the following is the correct formula that forms between nitrogen and barium?
A.
N2Ba3
B.
B2N3
C.
Ba2N3
D.
Ba3N2
E.
BaN
F.
N3Ba2
Question #2
Name the following substance: Fe2Pk3 where Pk is a hypothetical element named "Pink". The ion form of Pink is a -2 charge.
A.
iron pink
B.
iron (III) pinkade
C.
iron (III) pinkide
D.
iron (II) pinkade
Question #3
Give the systematic name for the following substance: SF3
A.
sulfur fluoride
B.
sulfur trifluoride
C.
sulfur fluorite
D.
sulfur trifite
Question #4
Give the systematic name for the following substance: Cs2Cr2O7
A.
cesium dichromate
B.
cesium chromate
C.
cesium dichromide
D.
cesium dichromite
Question #5
Give the systematic name for the following substance: Zn(NO2)2
A.
zinc nitride
B.
zinc nitrite
C.
zinc nitrate
D.
zinc nitrade
Question #6
An hypothetical polyatomic ion MxO2- is named maxite. Use the systematic rules to name the following hypothetical compound: HMxO3
A.
maxim acid
B.
maxite acid
C.
maxic acid
D.
max acid
Question #7
Use the systematic rule to name the following hypothetical compound: Bb2Sh6 Note: Bb = baby, Sh = shark. Bb and Sh are nonmetals.
A.
dibaby hexasharkide
B.
bibaby hexasharkade
C.
bibaby hexasharkide
D.
doubaby hexasharkite
Question #8
Write the chemical formula for the compound that forms between aluminum and nitride
A.
Ba2S
B.
Al3N3
C.
AlN
D.
N3Al3
E.
S2Ba2
Question #9
How many molecules of ethanol (C2H5OH) are contained in 15.0 mL of ethanol? The density of ethanol is 0.789 g/mL.
A.
1.55 x 1023
B.
None of these responses apply.
C.
2.99 x 1023
D.
2.54 x 1023
E.
5.15 x 1026
Question #10
If a sample of carbon dioxide contains 3.8 moles of oxygen atoms, how many moles of carbon dioxide are in the sample?
A.
11.4
B.
7.6
C.
None of these responses apply.
D.
3.8
E.
1.9
Question #11
The reaction for the oxidation of NH3 is given as: 4 NH3 + 5 O2 → 4 NO + 6 H2O Under certain conditions the reaction will proceed at 29.8% yield of NO. How many grams of NH3 must be used to react with excess oxygen to yield 70.5 g of NO? Hint: 70.5 g of NO is the actual yield.
A.
134
B.
21
C.
None of these responses apply.
D.
2.37
E.
237
Question #12
To 3 significant figures, what is the mass percent of sulfate in Pb(SO4)2? Do not include any units.
A.
48.9
B.
45
C.
41.8
D.
48.1
E.
4.81
Question #13
You have 9 molecules of N2O5. How many atoms do you have? Give a numerical value. Do not include units.
A.
73
B.
36
C.
53
D.
63
Question #14
A substance is analyzed and it is found to contain 0.392 moles of phosphorus atoms and 0.653 moles oxygen atoms. What is the empirical formula of this compound?
A.
PO2
B.
PO3
C.
P2O3
D.
P3O2
E.
PO
F.
P3O5
Question #15
What is the net ionic equation for the reaction that occurs when ammonium bromide is reacted with silver acetate?
A.
Br-(aq) + Ag+(aq) →AgBr(s)
B.
NH4Br(aq) + AuC2H3O2(aq) →(s) + NH4C2H3O2(aq)
C.
NH4+(aq) + C2H3O2-(aq) → NH4C2H3O2(aq)
D.
NH3Br(aq) + AgC2H3O2(aq) →(s) + NH3C2H3O2(aq)
E.
NH4Br(aq) + AgC2H3O2(aq) →(s) + NH4C2H3O2(aq)
Question #16
Which of the following are empirical formulas but not molecular formulas?
A.
Na2SO4, N2O6, CO2
B.
Na2SO4, NaCl, CO2
C.
Na2SO4, NaCl, N2O6
Question #17
When the following equation is balanced what is the coefficient of H2O(g)? Give your answer as a number. C2H6(s) + O2(g) ⟶ H2O(g) + CO2(g)
A.
2
B.
3
C.
4
D.
6
E.
5
Question #18
Which of the following may change in a chemical reaction and does not always stay constant?
A.
color, physical state, number of moleclules, temperature
B.
mass, type of atoms, number of atoms, color
C.
mass, type of atoms, physical state, number of atoms
D.
mass, temperature, physical state, number of atoms
Question #19
Which of the following compounds is/are soluble in water?
A.
MgSO4, KOH
B.
BaCO3, AgI
C.
BaCO3, MgS
D.
MgS, AgI
Question #20
Consider the reaction 2 Al(s) + 6 HCl(aq) ⟶ 2 AlCl3(aq) + 3H2(g) An excess amount of Al is added to 58 g HCl. What is the theoretical yield (in grams) of H2? Do not include units.
A.
1.9
B.
6.1
C.
1.6
D.
2.6
Question #21
Consider the equation 2 C3H6 + 9 O2 ⟶ 6 CO2 +6 H2O. How many moles of CO2 are produced if 5.3 moles of C3H6 reacts with 6.8 moles of O2. Do not include units.
A.
45
B.
5.4
C.
54
D.
4.5
Question #22
Find the mass in grams of chlorine that are in 4.8 g of CCl4? give answer as decimal notation; do not include units.
A.
4.7
B.
4.4
C.
4.6
D.
44
Question #23
When solid NaCl is stirred into water, which of the following is NOT true?
A.
Individual sodium and chloride ions are present
B.
The solution will taste salty
C.
The NaCl will fail to dissociate
D.
The solution will conduct electricity
Question #24
How many electrons will chlorine gain or lose when it forms an ion?
A.
gain 3
B.
lose 3
C.
gain 1
D.
lose 1
Question #25
Consider the reaction CH4 + 2 O2 ⟶ CO2 + 2 H2O. It was determined that the maximum yield of CO2 is 5.66 g. However, when the experiment was carried out only 2.24 g of CO2 was recovered. What is the percent yield of CO2.
A.
36.9
B.
39.6
C.
3.96
D.
396
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