Download Exam 2, Spring 2001

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1.
Oxidation of a primary alcohol produces an aldehyde, which oxidizes further to produce a carboxylic acid.
Oxidation of a secondary alcohol produces a ketone.
No reaction is observed for the oxidation of a tertiary alcohol.
Draw the structure of the alcohol and the structures of the product(s) formed from the oxidation of each of the
following alcohols.
a) (4 pts) 2-propanol
Problems 1, 2 and 3 will not be on the exam this Wednesday.
b) (4 pts) cyclohexanol
c)
(4 pts) ethanol
d) (4 pts) 2-methyl-2-propanol
2.
(6 pts) Polyvinyl chloride is an addition polymer of chloroethene, CH2=CHCl (commonly called vinyl
chloride). Draw the repeating unit for polyvinyl chloride.
3.
(8 pts) Draw the repeating unit of the condensation polymer produced using the following monomer.
CH3
HO –CH–C
O
OH
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4.
5.
(4 pts) Based on the colors of the aqueous solutions of the following coordination compounds, which complex
has the largest crystal field splitting? Circle the answer.
[Co(NH3)6]Cl3
orange-yellow
[Co(NH3)3Cl3]
green
[Co(NH3)5Cl]Cl2
purple
(2 pts) Which complex will absorb light of longer wavelength? Circle the answer.
K3[Fe(CN)6]
K3[FeF6]
6.
(4 pts) Draw the d-orbital diagram for the low-spin tetrahedral complex K2[Fe(CN)4]
.
7.
The color of an aqueous solution of the octahedral ion hexaaquanickel(II) is observed to be green.
a) (4 pts) Estimate the wavelength of absorption.
b) (4 pts) Estimate the crystal field splitting energy, ∆, in kJ.
8.
(8 pts)Consider a compound where a transition metal ion is coordinated to six NH3 ligands and chloride is the
counter ion. Addition of AgNO3 to an aqueous solution of the coordination compound results in a cloudy white
precipitate, presumably AgCl(s). You dissolve 0.100 g of the compound in water and titrate the solution with
0.0500 M AgNO3. The endpoint was reached after 9.00 mL of titrant was added. How many grams of chloride
ion were present in the 0.100 g sample?
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9. (4 pts) Give the systematic name for the following compounds.
[Pt(NH3)4Br2]Cl2
K2[Fe(CN)4]
10. (6 pts) Give the oxidation state of the central metal atom in each of the following coordination
compounds and the coordination number.
Oxidation State
Coordination Number
K2[Zn(CN)4]
[Cr(en)(H2O)2F2]Cl
[Cr(NH3)4Cl2]Br
11. (4 pts) Write the chemical formulas for the following compounds.
a) Tetraamineaquachlorocobalt(III)bromide
b) Sodium hexafluorovanadate(III)
12.
(6 pts) Draw the optical isomers of the octahedral complex [Co(NH3)2(H2O)2Cl2]+.
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13.
(8 pts) Draw the structural and geometric isomers of chloropropene. There are a total of four isomers. If you
draw more than four, you must cross out the ones that are incorrect.
14.
(8 pts) Calculate the molality of C2H5OH in an aqueous solution prepared by mixing 40.0 mL of C2H5OH with
120.0 mL of H2O at 20oC. The density of C2H5OH is 0.789 g/mL at 20oC.
15.
(8 pts) Ice cream is made by freezing a liquid mixture that, as a first approximation, can be considered a
solution of sucrose (C12H22O11) in water. Estimate the temperature at which the first ice crystals begin to appear
in a mix that consists of 34% (by mass) sucrose in water. Kf = 1.86 oC kg/mol