final_part1

# final_part1 - F inal Exam Wednesday, December 15, 2004 9:00...

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3.091 Fall Term 2004 Final Exam Wednesday, December 15, 2004 9:00 a.m. — 12:00 noon N a m e : (please print in UPPER CASE) Recitation Instructor: A complete test consists of 13 questions. Write your answers on these pages. State your assumptions and show calculations that support your conclusions. RESOURCES PERMITTED: PERIODIC TABLE OF THE ELEMENTS TABLE OF CONSTANTS AID SHEET (ONE PAGE 8½" × 11") CALCULATOR. NO BOOKS OR OTHER NOTES ALLOWED. USE OF WIRELESS COMMUNICATIONS DEVICES STRICTLY FORBIDDEN. #1 11 points #2 16 points #3 9 points #4 16 points #5 7 points #6 11 points #7 8 points #8 7 points #9 8 points #10 3 points #11 6 points #12 9 points #13 5 points Total 116 points % Score

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3.091 Fall Term 2004 Final Exam page 2 Problem #1 (11 points) Here is the phase diagram of water with attention given to phases present at high pressure. P(kbar) p n o (a) Name all phases present at X , Y , and Z . 6 X Y Z 5 (b) Rank the following in order of increasing density: VI, VII, VIII, liquid. Justify your choice.
9 3.091 Fall Term 2004 Final Exam page 3 Problem #2 (16 points) of the relevant acid dissociation constants ( pK a ). lysine (Lys) The skeletal structures of the two amino acids, glycine and lysine, are given below along with the values glycine (Gly) (a) Draw the skeletal structure of the dipeptide, Gly-Lys, when it is solvated in an aqueous solution under each of the following conditions. (i) pH = (ii) pH (iii) pH 1 = 12 = pI , the isoelectric point (b) Calculate the value of pI of the dipeptide, Gly-Lys, assuming that there is negligible shift in the 3 values of acid dissociation constants from the values of the constituent amino acids.

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## This note was uploaded on 11/02/2009 for the course CHEMISTRY 3.091 taught by Professor Donsadoway during the Fall '04 term at MIT.

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final_part1 - F inal Exam Wednesday, December 15, 2004 9:00...

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