_10s - Chem 201 Spring 2010 Exam 3 practice page 1 Consider...

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Chem 201 Exam 3 – practice page 1 Spring 2010 Consider the following unbalanced oxidation reduction reaction for the next three questions. 4 2 3 SO (aq) + Mn (aq) 6 MnO (s) + SO (aq) 2 ! 3+ 2 ! 3 1. The oxidation number of S in SO is____. 2 ! (a) +6 (b) +4 (c) ! 2 (d) +8 (e) +3 2. What is being oxidized in this reaction? 4 2 3 2 ! 3+ 2 ! 3. The complete balanced equation in ACIDIC media for the reaction has the following stoichiometry coefficients. (Note that some of the values may be 0 indicating that the compound does not appear!) 4 2 _____SO (aq) + _____ Mn (aq) + _____H O + _____H (aq) + _____OH (aq) 6 2 ! 3+ + ! 2 3 2 _____MnO (s) + _____ SO (aq)+ _____H O + _____H (aq) + _____OH (aq) 2 ! + ! The stoichiometry coefficients, in order are
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Chem 201 Exam 3 – practice page 2 Spring 2010 Consider the following electrochemical cell for the next 3 questions: 4 2 2 Sn / Sn(ClO ) (aq) // KI (aq), I (s) / Pt 4. What is the name of the aqueous ionic compound in the anode compartment? 5. What is E E cell? (a) ! 0.40 V (b) ! 0.68 V (c) ! 0.34 V (d) 0.68 V (e) 0.34 V (ab) +0.40 V 6. What is overall net ionic reaction occurring in the cell when current flows? 2 (a) Sn(s) + 2 I (aq) 6 Sn (aq) + I (s) ! 2+ 2 (b) Sn (aq) + 2 I (aq) 6 Sn(s) + I (s) 2+ ! 4 4 2 (c) Sn(s) + 2 ClO (aq) 6 Sn(ClO ) (aq) ! 2 (d) I (s) + 2 K (aq) 6 2 KI(aq) + 2 (e) Sn(s) + I (s) 6 Sn (aq) + 2 I (aq) 2+ ! 7. What does it mean when the oxidation states do NOT change in a reaction?
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Chem 201 Exam 3 – practice page 3 Spring 2010
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