Redox Reaction
balancing redox equations
Galvanic cell
Importance of electrochemistry/cells in our society
100
Redox reactions are also known as what?
Oxidation and Reduction Reactions
100
What are the two methods of balancing redox reactions?
oxidation number method and half-reaction method.
100
In a galvanic cell, what is the name of the electrode where oxidation occurs?
Anode
100
What is the difference between primary and secondary cells?
Primary: cannot be recharged; disposable
Secondary: rechargeable
200
Fill in the blanks:
In a redox reaction, oxidation is the ___ of electrons, and reduction is the ____ of electrons.
1. loss
2. gain
200
In an acidic redox reaction, which ion is added to balance oxygen atoms in redox reactions?
H2O (opposite side of the equation)
200
What is a galvanic cell?
A device made of 2 connected half-cells that spontaneously produce current electrical energy
200
What type of electrochemical cell is used in car batteries to start the engine?
Secondary cell (Lead-acid batteries)
300
In the reaction: Al(s) + 3Ag+ (aq) ->Al3+ (aq)+3Ag (s)
which element is reducing and which is oxidizing?
reducing: Ag (silver)
oxidizing: Al (aluminum)
300
How many steps are there for half-reactions method?
8 steps
300
What is the cell potential formula?
E°cell = E°cathode - E°anode
300
What type of rechargeable battery is used in electric vehicles?
lithium-ion batteries
400
Identify which is the oxidizing agent and which is the reducing agent.
2Cr3+ + Zn -> 2Cr2+ + Zn2+
oxidizing agent: 2Cr3+ -> 2Cr2+
reducing agent: Zn -> Zn2+
400
Balance the following reaction (*acidic*):
MnO4- (aq) + Fe2+(aq) -> Mn2+ (aq) + Fe3+(aq)
8H+(aq) + MnO4- (aq) + 5Fe2+(aq) -> Mn2+ (aq) + 5Fe3+(aq) + 4H2O
400
Name of the component that allows the ions to flow between the two half-cells of a galvanic cell?
salt bridge
400
Name of the electrochemical device used in chemical reactions to generate electrical energy and found commonly in cars?
Lead-acid battery
500
What does " LEO says GER" and "OIL RIG" stand for? **Hint in slideshow
LEO says GER: Losing Electrons is Oxidation
Gaining Electrons is Reduction
OIL RIG: Oxidation Is Losing
Reduction Is Gaining
500
Balance the following reaction (*basic*):
IO3- + C2O4-2 -> CO2 + I-
3H2O + IO3- + 3C2O4-2 -> 6CO2 + I- + 6OH-
500
Draw the basic components of a galvanic cell
500
How can we prevent corrosion? name atleast 2 stuff we talked about in class.
Coatings→ paint, metal plating, etc.
Alloying → combining two or more metals
Sacrificial anode
Impressed current