Chem 1010 - General Chemistry 1 » Fall 2021 » Homework 2
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Question #1
Given the thermochemical expression H2O (s) → H2O (ℓ) ∆r H◦= 6.0kJ / mol calculate the change in energy when 35.9 mol liquid water freezes.
A.
-205.4 kJ
B.
-215.4 kJ
C.
-214.5 kJ
Question #2
Given the thermochemical expression H2O (s) → H2O (ℓ) ∆r H◦= 6.0kJ / mol calculate the change in energy when 200.0 g liquid water freezes.
A.
-56.7 kJ
B.
-66.7 kJ
C.
-60.1 kJ
Question #3
Acetic acid, CH3CO2H is made industrially by the reaction of methanol and carbon monoxide. CH3OH (ℓ) + CO (g) → CH3COOH (ℓ) ∆r H◦= 135.3 kJ / mol If you produce 1.20 L acetic acid ( d = 1.044g/mL) by this reaction, calculate q(system) .
A.
-2825 kJ
B.
-2320 kJ
C.
-1980 kJ
Question #4
Use atomic orbital box diagrams to determine the number of unpaired electrons for each species. Mn has _______ unpaired electrons
A.
4
B.
3
C.
5
Question #5
Use atomic orbital box diagrams to determine the number of unpaired electrons for each species. Mn2+ has _______ unpaired electrons
A.
5
B.
4
C.
3
Question #6
Use atomic orbital box diagrams to determine the number of unpaired electrons for each species. Mn3+ has _______ unpaired electrons
A.
4
B.
3
C.
5
Question #7
Using only a periodic table (not a table of bond energies), predict which is the strongest bond.
A.
P-Cl
B.
P-Br
C.
P-I
Question #8
Use the VSEPR model to predict the electron-region geometry and the molecular geometry of this: AsH4+
A.
trigonal planar, bent
B.
tetrahedral, tetrahedral
C.
trigonal planar, trigonal planar
D.
tetrahedral, trigonal pyramidal
E.
linear, linear
F.
tetrahedral, bent
Question #9
Use the VSEPR model to predict the electron-region geometry and the molecular geometry of this: SBr2
A.
tetrahedral, trigonal pyramidal
B.
tetrahedral, tetrahedral
C.
linear, linear
D.
tetrahedral, bent
E.
trigonal planar, trigonal planar
F.
trigonal planar, bent
Question #10
Use the VSEPR model to predict the electron-region geometry and the molecular geometry of this: SO3
A.
trigonal planar, trigonal planar
B.
tetrahedral, bent
C.
trigonal planar, bent
D.
tetrahedral, tetrahedral
E.
tetrahedral, trigonal pyramidal
F.
linear, linear
Question #11
Use the VSEPR model to predict the electron-region geometry and the molecular geometry of this: H2CO
A.
tetrahedral, bent
B.
trigonal planar, bent
C.
linear, linear
D.
tetrahedral, tetrahedral
E.
trigonal planar, trigonal planar
F.
tetrahedral, trigonal pyramidal
Question #12
Which would have the greater O-X-O bond angle, PO2 or PO2+?
A.
PO2+
B.
PO2
Question #13
Describe the hybridization around the central atom and the bonding in SeCl2: Hybridization =
A.
sp2
B.
sp3
C.
sp4
Question #14
Describe the hybridization around the central atom and the bonding in SeCl2: Number of single bonds =
A.
2
B.
0
C.
4
Question #15
Describe the hybridization around the central atom and the bonding in SeCl2: Number of double bonds =
A.
4
B.
2
C.
0
Question #16
Describe the hybridization around the central atom and the bonding in SeCl2: Number of triple bonds =
A.
4
B.
2
C.
0
Question #17
Describe the hybridization around the central atom and the bonding in OCS: Hybridization =
A.
sp2
B.
sp
C.
sp3
Question #18
Describe the hybridization around the central atom and the bonding in OCS: Number of single bonds =
A.
0
B.
2
C.
4
Question #19
Describe the hybridization around the central atom and the bonding in OCS: Number of double bonds =
A.
0
B.
2
C.
4
Question #20
Describe the hybridization around the central atom and the bonding in OCS: Number of triple bonds =
A.
2
B.
0
C.
4
Question #21
Which of these molecules is (are) polar?
A.
CO2,CH3Cl
B.
CH3Cl, HBCl2
C.
CO2, BCI3
Question #22
For HBCl2, what is the direction of polarity; that is, which is the partial negative end and which is the partial positive end of the molecule? HBCl2 has the Cl atoms on partial ____ end and the H atom on the partial ____ end.
A.
negative... positive...
B.
positive… negative…
Question #23
For CH3Cl , what is the direction of polarity; that is, which is the partial negative end and which is the partial positive end of the molecule? CH3Cl has the H atoms on partial ___ end and theCl atom on the partial ____ end.
A.
positive… negative…
B.
negative... positive...
Question #24
Which of these substances has the highest melting point?
A.
C3H7COH
B.
CuO
C.
LiF
D.
CO
Question #25
Which of these substances has the lowest melting point?
A.
CuO
B.
C3H7COH
C.
CO
D.
LiF
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