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Practice Exam 1

# Practice Exam 1 - 6C Practice Exam 1 120 pts THIS PRACTICE...

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6C Practice Exam 1 120 pts THIS PRACTICE EXAM HAS BEEN PREPARED FROM ACTUAL EXAMS GIVEN AND IS ABOUT THE SAME LENGTH AND DIFFICULTY AS YOUR EXAM WILL BE. IT IS PRESENTED HERE FOR PRACTICE PURPOSES. WORD OF WARNING: DO NOT TAKE THE AMOUNT OF INDIVIDUAL TOPIC COVERAGES TO INDICATE HOW MUCH OF EACH AREA WILL BE REPRESENTED ON THE EXAM. FOR EXAMPLE, THIS EXAM IS LIGHT IN ELECTROLYSIS. YOURS MAY NOT! GIVE YOURSELF 90 MINUTES TO DO IT. APPENDED IS ALSO THE EQUATION SHEET AND PERIODIC TABLE YOU WILL RECEIVE ANSWERS WILL NOT BE POSTED FOR THIS EXAM

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Version A Page 2 of 6 Part 1. Calculation/Short Answer Problems (Values as shown) . All work for the following must be done in THIS TEST BOOKLET. For calculation problems: Answers with no work will receive zero points. Your work must be clear and logical AND SHOWN to receive maximum (OR ANY) credit. 1. The following initial rate data were collected at constant temperature for the reaction 2A + B + 2C D + E Trial [A] ( M ) [B] ( M ) [C] ( M ) Rate ( M /sec ) 1 0.225 0.150 0.350 0.0217 2 0.320 0.150 0.350 0.0439 3 0.225 0.250 0.350 0.0362 4 0.225 0.150 0.600 0.01270 a) Determine the order of A, B and C b) Calculate the value of the rate constant k (with proper units!). *************************************** 2. 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 ( Δ H ° )of this reaction is –61.33 kJ/mol. a) 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) Calculate Δ S , Δ S surr and Δ S tot for this reaction (Hint: you need to use your answer in part a in some way) c) Calculate the solubility product ( K sp ) for Al(OH) 3 . at 27 ° C d) Calculate the change in mass for the cathode if this cell is allowed to run for 1 hour with a current of 300 mA at 25 ° C. *************************************** 3. Balance the following equation under acidic conditions; show work to receive partial credit: C 7 H 8 O + Cr 2 O 7 2– Cr 3+ + C 7 H 6 O 2
Version A Page 3 of 6 Part 2. Multiple Choice Problems . Select the best answer from the choices given and mark your answer on your

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Practice Exam 1 - 6C Practice Exam 1 120 pts THIS PRACTICE...

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