Gcse Chemistry Electrolysis Flashcards
What is the name for the negative energy electrode
Cathode
What’s the name is the positive electrode
Anode
In electrolysis of aluminium oxide, what material is mixed with aluminium to lower the melting point
Cryolite
Why is using cryolite to lower aluminium melting point an advantage
Means less energy is needed, which saved money
What material are the electrode made of
Graphite
Why are the electrodes made of Graphite
Has a high melting point so the experiment can be done at high temperatures.
It’s good conductor of electricity
Why must the anode be regularly replaced
The oxygen molecules produced at the anode react with the carbon in the graphite to make carbon dioxide gas
Why is electrolysis very expensive
Melting the compounds requires a great deal of energy
It takes a lot of energy to produce the electric current
What’s does aqueous solution mean
Dissolved in water
What’s the rule for hydrogen ions in aqueous solution electrolysis
Hydrogen is produced at the cathode if the metal is more reactive than hydrogen
Is a metal is more reactive than hydrogen, what happens at the cathode
The hydrogen ion loses an electron to form hydrogen gas
