ELECTROLYSIS -- 5.4.3.2 Electrolysis of molten ionic compounds Flashcards
(22 cards)
What does molten mean?
Molten means the substance is heated until it melts into a liquid.
What occurs during electrolysis of molten ionic compounds?
Molten ionic compounds break into free-moving positive and negative ions, allowing electricity to flow.
What happens to positive metal ions during electrolysis?
They move to the cathode (-) and gain electrons (reduction).
What happens to negative non-metal ions during electrolysis?
They move to the anode (+) and lose electrons (oxidation).
What forms at the cathode during electrolysis?
A metal forms at the cathode.
What forms at the anode during electrolysis?
A non-metal forms at the anode.
What happens at the cathode (-) during electrolysis?
The metal ion gains electrons and becomes a pure metal.
What is the equation for lead bromide (PbBr₂) at the cathode?
Pb²⁺ + 2e⁻ → Pb
What is produced at the cathode when lead bromide (PbBr₂) is electrolyzed?
Lead (Pb) is produced.
What is produced at the cathode when sodium chloride (NaCl) is electrolyzed?
Sodium (Na) is produced.
What key rule applies to the product formed at the cathode?
The metal from the compound is always produced at the cathode.
What happens at the anode (+) during electrolysis?
The non-metal ion loses electrons and forms a gas or solid.
What is the equation for lead bromide (PbBr₂) at the anode?
2Br⁻ → Br₂ + 2e⁻
What is produced at the anode when lead bromide (PbBr₂) is electrolyzed?
Bromine gas (Br₂) is produced.
What is produced at the anode when sodium chloride (NaCl) is electrolyzed?
Chlorine gas (Cl₂) is produced.
What key rule applies to the product formed at the anode?
The non-metal from the compound is always produced at the anode.
What are the final products of the electrolysis of lead bromide (PbBr₂)?
Lead (Pb) and Bromine gas (Br₂).
Fill in the blank: Reduction happens at the _______.
[cathode]
Fill in the blank: Oxidation happens at the _______.
[anode]
What should you be able to predict for different molten compounds?
You should be able to predict the products.
True or False: The ions in molten ionic compounds are free to move.
True
What is the significance of the term ‘molten’ in electrolysis?
It indicates that the ions are free to move.
