6C-hoeger p-exam1

6C-hoeger p-exam1 - Chemistry 6C General Chemistry C Hoeger...

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Chemistry 6C: General Chemistry University of California, San Diego C. Hoeger PRACTICE Midterm 1 (120 points) THIS WAS THE ACTUAL EXAM GIVEN LAST FALL. IT IS PRESENTED HERE FOR PRACTICE PURPOSES. GIVE YOURSELF 55 MINUTES TO DO IT. APPENDED IS ALSO THE EQUATION SHEET AND PERIODIC TABLE GIVEN LAST YEAR ANSWERS WILL NOT BE POSTED FOR THIS EXAM RECORD THE “A” IN YOUR ID NUMBER AS “1” ON THE SCANTRON MARK TEST VERSION IN APPROPRIATE FIELD; PUT NOTHING IN THE EXAM NUMBER FIELD! ALL MULTIPLE CHOICE ANSWERS MUST BE ON THE SCANTRON SHEET PROVIDED. TURN IN BOTH YOUR SCANTRON SHEET AND THIS TEST BOOKLET AT THE END OF THE EXAM PERIOD. PLACE YOUR SCANTRON INSIDE YOUR EXAM BOOK WHEN DONE KEEP YOUR EXAM COVERED AT ALL TIMES. SCRATCH PAPER AND A PERIODIC TABLE/EQUATION SHEET ARE PROVIDED ***PAY ATTENTION TO YOUR UNITS, ESPECIALLY TO THEIR MAGNITUDES!!***
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Page 2 of 5 Part 1. Calculation/Short Answer Problems (Values as shown) . All work for the following must be done in THIS TEST BOOKLET. Answers with no work will receive zero points. Your work must be clear and logical AND SHOWN to receive maximum (OR ANY) credit. 1. When an aqueous solution containing Al 3+ at 25 ° C is mixed with an aqueous solution of hydroxide at 25 ° C an immediate precipitate of insoluble aluminium hydroxide is formed: Al 3+ (aq) + 3 OH (aq) Al(OH) 3 (s) The standard reaction enthalpy ( H )of this reaction is –61.33 kJ/mol. a) ( 5 Pts ) If you were to construct a galvanic cell for the purposes of studying this reaction, what is the standard cell potential ( E ) that you would measure? The appropriate half reactions are: Al(OH) 3 (s) + 3 e Al(s) + 3 OH (aq) E = –2.30 V Al 3+ (aq) + 3 e Al(s) E = –1.68 V b) (
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This note was uploaded on 01/31/2010 for the course CHEM CHEM 6C taught by Professor Hoeger during the Summer '08 term at UCSD.

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6C-hoeger p-exam1 - Chemistry 6C General Chemistry C Hoeger...

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