Chemistry (Chapter 14)- Electrolysis
Why can ionic compounds only be electrolyzed when there are in a molten state?
Because the ions are free to move about and carry a charge
The ion move towards ________ charged electrodes
At the cathode, postively charged ions....
gain electrons (reduction)
At the anode, negatively charged ions
lose electrons (oxidization)
Use lead as an example of an ionic half equation that occurs in the cathode (-)
Pb2+ +2e -> Pb
Use bromine as an example of an ionic half equation that occurs in the anode(+)
If a mixture of ions are present, the products formed at the cathode depend on....
The reactivity of the ions
(The less reactive, the more likely it is a product)
If a mixture of ions are present, the products formed at the anode depend on.
Relative concentration of the ions present
(The higher the concentration, the more likely it is a product)
Explain the process of the electrolysis of aluminium
-Aluminum oxide from bauxite is extracted
-Cryolite is mixed with aluminum oxide to lower the boiling point
-Aluminium forms at the anode
-Oxygen forms at the cathode
What are the products of electrolyzing brine and name some uses for them
-Hydrogen (Making margarine)
-Sodium Hydroxide (Bleaches and soaps)
Why do we electroplate objects?
-Improve their appearance
-Ue smaller amounts of precious metals
How does electroplating work?
-The object to be electroplated is made in the cathode
-The planting metal is made at the anode