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ex-final-f06 - Chem 104 section 1 Final Exam Wednesday Your...

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Unformatted text preview: Chem 104 section 1, Final Exam Wednesday Dec 20, 2006 Your section's TA 1. (10 points) Draw the structure of an amide that has the following properties: 1. It has five carbons; and 2. It undergoes hydrolysis to form a carboxylic acid that has four carbons, two of which are methyl groups. pix 2. (10 points) Sodium hydroxide reacts with arsenic pentoxide (A5205) in water to afford sodium arsenate (NasAsO4). Write and balance the equation for this reaction. eqn 3 Halogenation... structure 3a (5 points) Draw the structure of 3,3-diethylhexane 3b. (25 pts) Chlorination (Clg/hv) of 3,3—diethylhexane affords a mixture of five chlorides, each of the molecular formula C1OH21CI. Draw them. No part credit for going nuts. No duplicates. 3c ( 10 points) Circle those structures in part 3b that are chiral. HO HO H 4 Complete oxidation of the sugar glucose, whether by fire or HO . . . O metabolism, produces carbon leXIde and water. HO HO 4a (10 pts) Write and balance the equation for this reaction. Use Glucose molecular formulas. eqn 4b (10 pts) Combustion of one gram of glucose produces how many grams of carbon dioxide? 5. (5 pts) .True or False: An endothermic one step reaction (A => B) will have a reaction coordinate diagram that looks like "RC-1." Circle one (this is right minus wrong so don't I guess!) 5 E A True ’ False RC“ In some cases but not always. °/a reaction -- 6. Acids and bases 6a (10 points) butyric acid (CH3CH2CH2C02H) is responsible for the pungent aroma of parmesan cheese. It has a pKa of 4.81. pH What is the pH of a 0.100 molar solution of butyric acid in water? 6b (5 points) What is the value of pr of the conjugate base of butyric acid? 6c (10 pts) What is the pH of a solution that is 1.0 molar in both butyric acid and its sodium salt? pH 6d (5 pts). The pH of a solution that is 0.10 molar in sodium hydroxide will have what pH? pH 6e (10 pts) One liter of a solution of butyric acid and its sodium salt, 1.0 molar in each (see part d) has added to it 0.10 mole of sodium hydroxide. What is the resulting pH? pH 7. (10 pts) The solubility product for barium fluoride (BaF2) in water at 25° C is given as 1.8 * 10'7. What is the fluoride ion concentration (in molar) for a saturated solution of barium fluoride in water at 25° C ? [F'] 7:? B K =0.0123 8. Consider the pair of reactions shown. eq 8a (5 pts). The major product at equilibrium is (circle one) 2 C Keq = 2049 Compound A Compound B Compound C No prediction can be made. 8b (10 pts). Draw a reaction coordinate diagram that summarizes this situation, where A is the starting reactant, C is product and the B => C step is rate determining. Make sure you get relative energies correct, but don't worry about absolute energies. Rxn Coordinate Diagram 9. Hydrolysis of 2—methyl-2— />( + Mac“ __——> />( + Nac. chlorobutane ("ROI") in dilute sodium Cl OH hydroxide solution proceeds as in Eq 1. Eq 1 The reaction is first order in [RCI]. The reaction is followed in dilute sodium hydroxide solution under pseudo first order conditions. The experimental conditions for the experimental run are as follows: Initial [RCI] = 0.032 molar; Initial [NaOH]= 1.0 molar; total volume = 1.0 liter. Data obtained are in table 1. RCI molar 9a (5 pts). The best value for the initial rate of this reaction, - . d[RCl]/dt, is (circle 1) 0.0286 E- * _4 . _1 0.0255 12.10 10 M min 00228 6.05*10'5 M min-1 EE- 6*10'6 M min-1 32*10-5 M min-1 No value can be determined 9b (5 pts) This reaction is (circle 1) Endothermic Exothermic Thermoneutral Not enough data. 9c (5 pts) The best value for the rate constant for this first order reaction is what? k 9d (5 pts) The half-life of this reaction is what? Include units. 10 (10 pts). A radioactive isotope of iodine, so-called "l-131", decays by emission of a beta particle. Write and balance the nuclear equation for this decay. Use standard nuclide notation. eqn 11 (10 pts). l-131 has a half-life of 8.02 days. How long in days will it take for a sample of M31, which exhibits 3000 counts per minute, to decay to 300 counts per minute? days 10 12 (10 pts) One microgram (1*10‘6 9.) of isotopically pure I-131 (atomic weight 127) will be how radioactive. Give your answer in disintegrations per sec. Note: there are 86400 seconds in a day. ...
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