Oxidation States
Half Reactions
Voltaic Cells
Electrolytic Cells
100
What is the oxidation state of ions in group 1?
+1
100
What does reduction mean in a redox reaction?
Gain electrons
100
Where does oxidation occur in a voltaic cell?
Anode
100
Where does reduction occur in an electrolytic cell?
Cathode
200
Determine the oxidation state of Cl in the following compound
MgCl2
-1
200
Is this a reduction or oxidation half-reaction?
Cu+2 + 2e- > Cu
Reduction
200
What is the purpose of a salt bridge?
Allows for migration of ions
200
In an electrolytic cell, electrical energy is converted to what type of energy?
Chemical
300
Determine the oxidation state of oxygen in the following compound:
H2O2
-1
300
Write an oxidation half-reaction for Al/Al+3
Al -> Al+3 + 3e-
300
Draw the flow of electrons on this voltaic cell.
Right to left
300
State one reason this is an electrolytic cell
Power source, one solution, no salt bridge
400
Determine the oxidation state of Cl in the following compound
KClO3
+5
400
Write the overall balanced redox reaction
Cu+2 + Ni+ -> Cu+ + Ni+4
2Cu2++ Ni+ -> 2Cu+ + Ni+3
400
Draw a voltaic cell with potassium and iron electrodes, and show the flow of electrons
Potassium -> Iron
400
Which electrode is the anode?
Cu rod
500
Which substance is being oxidized in the following reaction:
2CuSO4 + 4KI -> 2CuI + I2 + 2K2SO4
I-
500
Write the overall balanced redox reactions of the following:
Ag/Ag+ and Ca/Ca2+
Ca + 2Ag+ -> Ca2+ + 2Ag
500
Compare the pH of this solution before and after the redox reaction has taken place
The pH afterwards is higher
500
Explain why the following is a nonspontaneous redox reaction
Cu + Pb2+ -> Pb + Cu+2
Cu is being oxidized (despite being less reactive)
Pb2+ is being reduced