C6 Flashcards
Why can’t solid ionic compounds not conduct electricity
- ions are locked in place and can’t move
- when ionic bonds are dissolved or melted forces of attraction are broken and electrons are free to move and can carry a charge. It’s called electrolytes
What’s the negative a positive electrode called
- Cathode
+ Anode
How are elements more reactive then carbon extracted
By electrolysis
How are elements that are less reactive then carbon are extracted
It’s extracted by reduction with carbon
How is aluminium ion used
It’s mixed with cryolite which lower melting point and lowers the energy needed to melt it so it saves money
Why must the anode be replaced regularly
As the O2 molecules react with graphite to form CO2
Why is electrolysis expensive
Melting a compound requires a lot of energy and this is expensive as a lot of energy is needed to form an electric current
How is aluminium oxide extracted from the ore brauxide
It’s oxidised in extraction of aluminium metal
How can ionic compounds be electrolysed
When they are molten or dissolved in their ions are free to move and carry a charge
How are electrolysis of an aqueous solution done
Aqueous solution is dissolved in water
Water molecule ionise (split) to form hydrogen and hydroxide ions
In electrolysis how is hydrogen formed
They are produced at the cathode if the metal is more reactive than hydrogen
What’s the most important feature of electrodes
It doesn’t react and platinum is often used as insert as it’s unreactive
If aqueous solutions contain halide ions such as chloride what is produced at the anode
Hydrogen will be produced at the anode and 02 is discharged
