14C_s11_lec02_finalA

14C_s11_lec02_finalA - Chemistry 14C Lecture 2 Spring 2011...

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Chemistry 14C Lecture 2 Spring 2011 Final Exam Part A Page 1 Page 1 score = O OH d H a O OH b O H OH c Ascorbic acid (HAsc) The questions on this page refer to ascorbic acid (vitamin C), a hydrophilic antioxidant. It is found in most citrus fruits, such as oranges and mangoes. 1. (3) Define: Hydrophilic 2. (3) Complete this statement by adding no more than fifteen words : Ascorbic acid is not a lipid because. .. 3. (2) Which OH hydrogen of ascorbic acid is most acidic? Circle one: OH a OH b OH c OH d 4. (2) Circle the best statement concerning the relative acidity of acetic acid (CH 3 COOH or HOAc) and ascorbic acid (HAsc): HOAc > HAsc HOAc very nearly = HAsc HOAc < HAsc 5. (2) The p K a of CH 3 COOH is 4.8. Therefore the p K a of ascorbic acid is closest to (circle one): 4.1 4.8 5.5 Cannot be estimated from the given information 6. (5) For simplicity, we'll abbreviate the conjugate base of acetic acid as - OAc, and the conjugate base of ascorbic acid as - Asc. (a) Define: Conjugate base (b) What can be concluded about the position of following proton transfer equilibrium? HOAc + - Asc - OAc + HAsc Circle one: K eq < 1 K eq very nearly = 1 K eq > 1 7. (6) By adding, subtracting, or transmuting (i.e., changing into another element like Pb into Au) exactly one atom , redraw ascorbic acid in the box so that it is obviously more acidic . Then complete the explanation by adding no more than twenty words . Modified ascorbic acid My modified structure is more acidic than ascorbic acid because. ..
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Chemistry 14C Lecture 2 Spring 2011 Final Exam Part A Page 2 Page 2 score = Many organisms produce α -tocopherol, another antioxidant molecule. O
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This note was uploaded on 09/06/2011 for the course CHEM 140A taught by Professor Whiteshell during the Fall '04 term at UCSD.

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14C_s11_lec02_finalA - Chemistry 14C Lecture 2 Spring 2011...

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