001 - 5‘5 BCHM 561 Fall 2009 NAME EXAMT Please write...

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Unformatted text preview: 5‘5 BCHM 561 Fall 2009 NAME EXAMT % Please write legibly in the space provided. if additional space is needed to write your answers, use the back of the pages provided making sure you include the question number. The total points assigned to each question are enclosed in brackets. There are a total of 200 points. There may be more than one correct selection for multiple choice questions. Circle all correct choices. CONCEPTS FROM CHEMISTRY (Chapter 1) 1. [4] Describe two things that the free-energy change (AG) can reveal about a biochemical reaction or process. Us {wow/L1 {>4 recovers. W? w l ‘Z1wl‘QN1W 41% remit at”! W 11 pm 1 c1 ”"1 sJJWC 1/\ {>1 166.1" 2. [4] For a chemical or biochemical reaction occurring at constant pressure and volume, the equation for the free-energy change (AG) contains two terms, the change in enthalpy (AH) and change in entropy (AS). Which of these two terms expresses or most closely reflects the number and nature of the chemical bonds and/or noncovalent interactions that are formed and broken during the ' {MW-W5 (AH) 3. [6] AH and —TAS values are given below for four different biochemical reactions. Which of these reactions are thermodynamically favored processes tfit will occur spontaneously? (circle the corr tanswers) (‘3); Di" 'Tfl3 6H=—32kJ/mol —TAS=—13kJ/mo| 56"73’31' *15‘”101 fightg—SBKJ/mol —TAS=+106kJ/mo| AC», ="91.0 "IOLD : ,ma @a—WKJ/mol -TAS=+16kJ/mol AG) 3 7‘0 ‘10’ “31.9 I R ’ 13- AH=+100 kJ/mol —TAS=+22 kJ/mol DC? :IOO ‘33 5 ;L9 Using the AH and —TAS values given above, can you predict which of the four reactions will occur at the greatest rate? Yes (@‘3 Based on the AH and —TAS values provided above, which for the four reactions occurs with the greatest increase in the randomness or disorder of the system? W C D -1- ...
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