midterm_1_chem_237_fall_2010_version_003

midterm_1_chem_237_fall_2010_version_003 - Chem 237...

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Chem 237 Midterm #1 October 12, 2010 Version 003 Instructions: There are 31 questions on this exam There are 8 pages Fill in the version number 003 on your scantron test master box Make sure you copy your answers to the scantron in the allotted time. You will not be allowed to do so after time is up Fill in E for question 32 for a bonus mark Useful equations and constants are at the bottom of the page Useful Information G = H - T S G = G 0 + RTlnQ pH=pKa +  A HA  
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Chem 237 Midterm 1 Fall 2010 October 12, 2010 Version 003 2 1. How many bonds are there to an O atom, most often? A) 5 B) 4 C) 3 D) 2 E) 1 2. The equilibrium constant for a reaction is1.17x10 3 at 37 °C. Which of the following statements is always true? A) G 0 is approximately equal to 1 B) The reaction is always spontaneous as written C) G 0 at 25ºC is 18.2 kJmol -1 D) G 0 at 25ºC is -18.2 kJmol -1 E) The reaction is endothermic. 3. In the tricarboxylic acid cycle L-malate is spontaneously converted to oxaloacetate. L-malate oxaloacetae G 0 = +30 kJmol -1 . What is the ratio of the concentrations of oxaloacetate to maleate    malate L te oxaloaceta at 37 °C? A) much much greater than 1 B) Approximately equal to 1 C) much much smaller than 1 D) If G0 > 0 a reaction is not spontaneous under any conditions E) cannot tell from the information given 4. The entropy of the universe always increases for a spontaneous process. A TRUE B FALSE 5. Consider a reaction with the following thermodynamic properties: H 0 = 23 kJmol -1 and S 0 =22 JK -1 ·mol -1 . G 0 < 0 if T < 1045K. A TRUE B FALSE 6. Which of the following statements is false about the role of water in the cell? A) There are on average 2-3 hydrogen bonds between water molecules in the liquid state. B) It forms solvation shells around polar and charged solutes C) Soluble cellular components usually form hydrogen bonds with water. D) water never participates in chemical reactions in the cell E) In solid water, ice, there are 4 hydrogen bonds between adjacent water molecules
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Chem 237 Midterm 1 Fall 2010 October 12, 2010 Version 003 3 7. The pKa of acetic acid is 4.75. Which of the following combinations will give you a pH= 4.75
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This note was uploaded on 12/02/2010 for the course CHEM 233 taught by Professor Daub during the Fall '09 term at Waterloo.

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midterm_1_chem_237_fall_2010_version_003 - Chem 237...

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