C2 Electrolysis Flashcards
What do the following state symbols mean?
(g)
(s)
(aq)
(l)
Gas
Solid
Aqueous=dissolved in water
Liquid
What are ions able to do when melted or dissolved in water?
Move
What is electrolysis?
Using electricity to break up an ionic substance
During electrolysis what happens to the positive ions?
Attracted to the negative electrode
During electrolysis what happens to the negative ions?
Attracted to the positive electrode
What happens to the ions at the negative electrode?
Positive ions gain electrons
What happens to the ions at the positive electrode?
Negative ions lose electrons
What does OILRIG mean?
Oxidation is loss of electrons
Reduction is gain of electrons
What are the 3 products of the electrolysis of sodium chloride solution?
Sodium hydroxide, Chlorine, Hydrogen
Give one use of each product?
Sodium hydroxide =soap
Chlorine=clean water
Hydrogen=margarine
Give the half equation for the reaction at the positive electrode?
2Cl- → Cl2 +2e-
Give the half equation for the reaction at the negative electrode?
2H+ + 2e-→ H2
How can copper be purified using electrolysis?
Use copper solution and 1 pure electrode and one impure electrode
What is electroplating?
Using electrolysis to add a thin layer of metal
What happens at the positive electrode in the electrolysis of aluminium oxide?
2O2- → O2 +4e-
