extracting metals Flashcards
Why can carbon not be used to get aluminium from aluminium ore?
Aluminium is too reactive
An ionic compound can only be electrolysed when it is in a molten state or in a solid state?
molten
In extraction by electrolysis, which ions go to the negative electrode (cathode)? Metals or non metals?
metals
What is the correct name for the positive electrode?
anode
What is the name of the negative electrode
cathode
What is the electrolyte?
the molten or dissolved substance been electrolysed
Cations are positive so the go to the
negative electrode, the cathode.
Anions are negative so go to the
positive electrode, the anode
If electricity is passed through molten lead bromide, what happens?
It splits into lead and bromine
If electricity is passed through molten zinc chloride, what happens?
Zinc is formed at the cathode and chloride at the anode
What is produced when concentrated aqueous copper chloride is electrolysed?
Copper at the cathode and chlorine at the anode
What is electrolysis
he process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them.
For electrolysis to work, the compound must contain
ions
covalent compounds do not work in electrolysis becuase
they contain neutral atoms.
The ions must be
free to move
Positively charged ions move to the
negative electrode during electrolysis
Negatively charged ions move to
the positive electrode during electrolysis
reduced means
gaining electrons
oxidised means
losing electrons
