Final Practice CHEM

Final Practice CHEM - Your name (Last)______________...

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Unformatted text preview: Your name (Last)______________ (First)__________ Your section _______Your TA______________ Date ____________ Student ID ______________ Signature ______________ Practice Final Thursday, July 29, 2010 10:00 AM 11:40 AM CHEM 2A, Summer 2010 Professor Guo This is a closed book exam. The only thing you may consult with is a pocket calculator or similarly functional math tool. Problem points 1 /10 (Mid II) 2 /20 (Mid I) 3 /20 (Mid I) 4 /20 (Mid II) 5 /10 (Mid II) 6 /40 7 /20 8 /20 9 /20 10 /20 11 /20 12 /20 Total /240 Please complete as much as possible because these are all partial credit problems Question 1 (10 points) 2 L of oxygen at 1.5 atm is mixed with a 0.5-L chamber filled with hydrogen at 2.0 atm at 0 C. What is the total pressure right before the reaction? [5 points] Calculate the energy released from this reaction, in kJ. (The bond energy for O-H is 464 kJ/mol, O=O is 498 kJ/mol, and H-H is 436 kJ/mol.) [5 points] Question 2 (20 points) CrO 4 2- and S 2 O 4 2- undergo a redox reaction in acidic conditions to form Cr(OH) 3 (s) and SO 3 2- . Assign an oxidation state to each element in these four compounds. Balance the overall reaction using half reactions (reduction and oxidation). Clearly show each step of how you balance the equations. [10 points] Name the oxidizing agent and reducing agent. [5 points] If 1 g of CrO 4 2- is used, how many moles of electrons are transferred? Specify the direction of the electron transfer (from which element to which element). [5 points] Question 3 (20 points)...
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Final Practice CHEM - Your name (Last)______________...

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