Chem 220    CC # 8   5 points   Name _________________________________lab _____

Question 1

T   F   A voltaic cell supplies electrons.

T   F   MnO₄^- is a better oxidizer than Cr₂O₇ ^2-

T   F   You can have two anodes in an electrolytic cell.

T   F   Oxidation is the gain of electrons.

T   F   The electrolysis of salt water is a spontaneous process.

Question 2   Balance the following redox reaction and label the oxidizing agent and the reducing agent.

N₂O  +  Cl₂ à  HNO₃  +  Cl ^–

Question 3     When H_2­C₂O₄ is added to MnO₄^-, it is determined that Mn²⁺ and CO₂ are produced. What is the redox reaction? What is the oxidizer? What is the reducer?

Question 4    Given the following set of half reactions write the spontaneous reaction under standard conditions. What is the standard cell potential ?

Fe³⁺ +  3 e^- ó Fe

Cu²⁺  +  2 e^- ó Cu

Question 5       Calculate the potential generated by a cell consisting of two iron electrodes, one in a 0.10 M Fe³⁺ solution and the other in a 0.50 M Fe³⁺ solution. Write the cell notation for this cell reaction.