Oxidation States
The oxidation number of any metal in its elemental state.
What is 0.
Oxidation takes place at the ______ and reduction takes place at the ______ .
What is the anode, cathode.
The difference between oxidation and reduction.
What is oxidation is loss of electrons and reduction is gain of electrons
An electrochemical cell that generates electrical energy is called...
Galvanic or Voltaic cell
The ox and cat in electrochemistry help you remember.
What is anode and cathode.
The oxidation number of this type of ion is the same as its charge.
What is a monotomic ion.
The device used to maintain electrical neutrality.
What is the salt bridge.
The oxidizing agent in this reaction. Zn(s) + 2H+(aq) --> Zn+2(aq) + H2(g)
What is 2H+.
An electrochemical cell that requires energy is called...
electrolytic cell
When determining anode and cathode, you make the most positive reduction potential the ____________
what is the cathode
The oxidation number for Magnesium in MgF2.
What is +2.
The electrons in a galvanic cell with zinc and copper flow towards the ______ metal electrode .
What is towards the copper electrode.
During redox reactions, oxidizing agents _________ in oxidation number
decrease
Find the standard cell potential for an electrochemical cell with the following cell reaction. Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s)
Eoreduction of Cu2+ = + 0.339 V
Eoreduction of Zn2+ = - 0.762 V
What is Eocell = + 1.101 V
Zn(s) Zn2+(aq) + 2 e- Cu2+(aq) + 2 e- Cu(s) Eooxidation of Zn = - ( - 0.762 V) = + 0.762 V
What are the oxidation numbers for each element in SO42-?
S= 6+ and O=2-
The oxidation number for each element in PO4-3
What is -2 for oxygen and +5 for phosphorus.
What happens to the mass of the metal cathode in a galvanic cell?
increases
Na --> Na+ + e-
The reaction above is an example of...
An oxidation half reaction
the positive ions flow from anode to cathode in order to...
balance the buildup of charge (offset the negative electrons)
Ca + Cl2 --> CaCl2
Identify the oxidizing agent and state why
chlorine because its oxidation number decreases/is reduced
The oxidation number zinc in this reaction changes from. Zn + I2 --> ZnI2
What is 0 to +2.
Using a galvanic cell containing Zinc and Copper, write the cell notation. Zn+2 + 2e- --> Zn(s) = -0.76 Volts Cu+2 + 2e- --> Cu(s) = 0.34 Volts
What is Zn(s) | Zn2+(aq) || Cu2+(aq) | Cu(s)
Which reaction is NOT a redox reaction
1. 2H2 + O2 → 2H2O
2. Zn + CuSO4 → ZnSO4 + Cu
3. 2H2O2 → 2H2O + O2
4. H2O + CO2 → H2CO3
Question 4
Calculate the Ecell and write the overall reaction for:
Ag++e--->Ag Eo = 0.80V
Zn2+ + 2e- --> Zn Eo = -0.76 V
What is Eocell = + 1.56 V
Create a galvanic cell using copper II nitrate, Silver nitrate, copper metal, silver metal, potassium nitrate.
Label all the parts and directions of each ion and electron flow