_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. 42 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? 3 (a) SO (b) MnO (c) Mn (d) SO 2 ! 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!) _____SO (aq) + _____ Mn (aq) + _____H O + _____H (aq) + _____OH (aq) 6 2 ! 3+ + ! 232 _____MnO (s) + _____ SO (aq)+ _____H O + _____H (aq) + _____OH (aq) 2 ! + ! The stoichiometry coefficients, in order are (a) 1,1,1,0,0 6 1,1,0,2,0 (b) 1,1,0,2,0 6 1,1,1,0,0 (c) 1,2,3,0,0 6 2,1,0,6,0 (d) 2,1,0,6,0 6 1,2,3,0,0 (e) 1,2,0,0,6 6 2,1,3,0,0
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Chem 201 Exam 3 – practice page 2 Spring 2010 Consider the following electrochemical cell for the next 3 questions: 42 2 Sn / Sn(ClO ) (aq) // KI (aq), I (s) / Pt 4. What is the name of the aqueous ionic compound in the anode compartment? (a) tin chloride (b) potassium iodide (c) sodium iodine (d) sodium chlorate (e) tin(II) perchlorate 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+ ! 44 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? (a) The reaction is not an oxidation-reduction reaction. (b) The reaction is a very favorable oxidation-reduction reaction. (c) The reaction is a very unfavorable oxidation-reduction reaction. (d) The reaction is just an oxidation reaction. (e) The reaction is just a reduction reaction.
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Chem 201 Exam 3 – practice page 3 Spring 2010 8. Before the development of the pH electrode (in the 1950's), the following concentration cell was routinely used to measure pH: 22 Pt / H (g, 1 atm), H (aq, 1 M) // H (g, 1 atm), H (aq, ? ) / Pt
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This note was uploaded on 05/13/2010 for the course CHEM 201 taught by Professor Smith during the Spring '08 term at San Diego State.

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

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