4. Chemical Changes (electrolysis - in a molten ionic compound) Flashcards
When an ionic compound is melted or dissolved in water, what are the ions able to do?
The ions are free to move about within the liquid or solution
What is the liquid/solution that is able to conduct electricity called in electrolysis?
Electrolyte
What is electrolysis?
The breaking down of an ionic compound using electricity, to separate the solution into elements
What is the electrolyte?
An ionic compound
During electrolysis, where do positively charged ions go?
To the negative electrode
What is the negative electrode called?
Cathode
During electrolysis, where do negatively charged ions go?
To the positive electrode
What is the positive electrode called?
Anode
Where are ions discharged and what does this produce?
Ions are discharged at the electrodes, producing elements
What does molten mean?
melted
When a molten ionic compound is electrolysed, where is the metal and non-metal produced, use lead bromide as an example?
- metal is produced at the cathode (lead)
- non-metal is produced at the anode (bromine)
How are metals that are more reactive than carbon extracted?
Using electrolysis
When is electrolysis used?
- If the metal is too reactive to be extracted by reduction with carbon
- If the metal reacts with carbon
What are large amounts of energy used for in electrolysis?
- melting the compounds
- producing the electrical current
How is aluminium manufactured?
through the electrolysis of aluminium oxide and cryolite, with carbon as the anode
