Chapter 6 - Chemistry Flashcards
What does electrolysis mean?
It means breaking down using electricity
What is the positive electrode called?
The anode
What is the negative electrode called?
The cathode
What is the compound broken down by electrolysis called?
The electrolyte
Where do positively charged ions moved to in electrolysis?
To the cathode (negative electrode)
Where do negative ions move to in electrolysis?
The anode (positive electrode)
When can ionic compounds be electrolysed?
When they are molten or dissolved in water, this is because their ions are then free to move and carry their charge to the electrodes
What happens at the negative electrode with the positively charged ions?
Positively charged ions gain electrons, so are reduced
What happens at the positive electrode with the negative ions?
They lose their extra electrons, so are oxidised
When electrolysis happens in the aqueous solution, what is produced at the cathode?
Either hydrogen or the metal
When electrolysis happens in the aqueous solution, what is produced at the anode?
Either oxygen gas given off, from discharged ions produced from water
A halogen produced if the electrolyte is a solution of a halide
Where is aluminium oxide extracted in?
In the extraction of aluminium metal.
What is the aluminium oxide mixed with?
It’s mixed with the molten cryolite to lower it’s melting point, reaching the energy needed to extract the aluminium
Where does aluminium form?
It forms at the cathode (negative electrode)
Where does oxygen form?
It forms at the anode (positive electrode)
