C2.7 Electrolysis Flashcards
What is electrolysis
The separating of things using electricity
What happens at the positive electrode?
Negative ions lose their electrons to become charge less and are pulled with the current from the battery
What happens at the negative electrode?
Positive ions pick up electrons and become atoms again
What are cations?
Positively charged ions
What is the negative electrode called?
Cathode
What are negatively charged ions called
Anions
What is an anode
The positively charged electrode
What are Halides?
Chloride, Bromide, Fluoride, Iodide
all above hydroxide
What do non halides form at the anode?
Oxygen
What do halides form at the anode?
Halogens (any of the elements fluorine, chlorine, bromine, iodine, and astatine)
If the salt is more reactive than hydrogen will it produce hydrogen or the metal at the cathode?
Hydrogen
Potassium Sodium Magnesium Aluminium Carbon Zinc Iron Tin Lead
If the salt is less reactive than hydrogen will it produce hydrogen or the metal at the cathode?
The metal
Copper
Silver
Gold
Platinum
How can you use electrolysis to extract aluminium from aluminium oxide?
Dissolve bauxite to cryolite and heat until it melts as it melts at a lower temperature to bauxite.
The positive carbon electrode is placed in the solution where as the walls are negatively charged. These attract the positive aluminium which falls to the bottom and can be filtered off.
The carbon and oxygen form CO2
This is continuous, although the carbon electrode needs to be replaced.
How can you use electrolysis in metal plating?
The object you want plated is placed
