Reduction: gain of electrons
Oxidizing Agent: substance reduced
Reducing Agent: substance oxidized
Anode: electrode where oxidation occurs (AN OX)
Cathode: electrode where reduction occurs (RED CAT)
Salt Bridge: allows the flow of ions between the anode and cathode solutions to keep a balance of charge
- Cations flow toward the Cathode
- Anions flow toward the Anode
Single replacement reactions are always Redox – Table J is used to predict which metal will replace another. More active free metal will replace less active metal in a compound.
Double replacements never are Redox.
- Batteries
- Spontaneous redox reaction
- Generates Electric Current
- Positive Voltage
- Anode is NEGATIVE
- Cathode is POSITIVE
- Cathode gains weight
- Electrons move from Anode --> Cathode
- Non-spontaneous redox reaction
- Electricity must be used for reaction to occur
- Negative Voltage
- Used to obtain pure elements from aqueous ions
- Anode is POSITIVE
- Cathode is NEGATIVE
- Electrons move from Cathode --> Anode
