DECEMBER 10, 2001Name:____________________________Student ID No:____________________CHEMISTRY 226 FINAL EXAM DECEMBER 10, 2001 Name:____________________________ Student ID No:____________________ I. (2 pts each) Define eight of the following terms. Clearly mark the two you do not want graded. 1. Resolution 2. Spectrometer 3. Masking 4. Reduction 5. Anode 6. Photoluminescence 7. Accuracy 8. Null Hypothesis 9. Eluent 10. Amphiprotic SolventII. A sample of sea water contains an average of 1.08 X 103 ppm Na+ and 270 ppb SO42-. 1. (4 pts) Calculate the mass Na+ and SO42- in 1 L of sea water assuming a density of 1.02 g/mL. 2. (2 pts) What is the molar concentration of SO42- in units of µM? III. (4 pts) Calculate the solubility product constant for a 4.7 X 10 –6 M Ag3PO4 solution. IV. (5 pts) The hydrogen sulfide in a 50.0 g sample crude petroleum was removed by distillation and collected in a solution of CdCl2. The CdS precipitate was filtered, washed and ignited to CdSO4, Calculate the % H2S in the sample if 0.108 g CdSO4 was recovered. MW (CdSO4) = 208.47 g/mol; MW H2S = 34.08 g/mol.V. Consider the following set of data. Show all calculations. Trial Number Value (mL) 1 69.94 2 69.92 3 69.80 1. (2 pts) Calculate the mean. 2. (2 pts) What is the median? 3. (3 pts) Calculate the standard deviation. 4. (3 pts) Calculate the 95% confidence limit if we do not know σ. 5. (3 pts) Use the appropriate statistical test to determine if the 69.80 value is an outlier at the 95% CL.VI. (5 pts) Use activities to calculate the solubility of PbI2 (Ksp = 7.9 X 10-9) in a 0.033 M solution of Mg(ClO4)2. VII. (5 pts) Calculate the potential of a Pt electrode in a solution that is 0.0813 M K4Fe(CN)6 and 0.0056 M in K3Fe(CN)6. VIII. (8 pts) For the following cell write each half reaction as a reduction. PbPb2+ (0.1393) Cd2+ (0.0511M)Cd 2. (4 pts) Calculate the theoretical potential of the cell.VIII 1. (6 pts) Express a wavelength of 3000 nm in wavenumbers and Hertz. . 2. (3 pts) Calculate the energy of a photon of wavelength 3000 nm. IX. (4 pts) The complex formed between Cu+ and 1,10 phenanthroline has a molar absorptivity of 7000 L/mol cm at 425 nm. Calculate the absorbance of an 8.50 X 10-5 M solution in a 1 cm cell at 425 nm. (2 pts) Calculate the % Transmittance. X. (9 pts) Indicate what types of transitions occur when a molecule absorbs each type of radiation. 1. Infared 2. Visable 3. UltravioletXI. (5 pts) Draw a block diagram and describe the operation of a gas chromatograph. Include in your description at least two common detectors and the types of samples for which the use of a GC is applicable. XII. (5 pts) Draw a block diagram and describe the operation of a high pressure liquid chromatograph. Include in your description two common detectors and the types of samples for which the use of HPLC is
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