ELECTROLYSIS Flashcards
(15 cards)
In electrolysis, are positive ions attracted to the anode or the cathode?
Cathode
Explain why graphite is often used for electrodes
It conducts electricity and is relatively unreactive
Describe how gas can be collected during electrolysis
With an inverted ( upside down ) test tube or measuring cylinder
Explain why the anode needs to be continually replaced in the electrolysis of aluminium oxide
Oxygen is produced at the anode
Oxygen reacts with the anode - made of carbon
This produces carbon dioxide
Causing the anode to wear away
Name the products at the anode and cathode during the electrolysis of AgCl
Anode - Chlorine
Cathode - Silver
In electrolysis, are negative ions attracted to the anode or the cathode
Anode
Name the products at the anode and cathode during the electrolysis of CuSO4 ( aq )
Cathode - Copper
Anode - Oxygen
Name the products of the electrolysis of molten iron bromide
Iron and bromine
State the observation at the anode and cathode during the electrolysis of AgCl ( aq )
Anode - bubbles
Cathode - silvery metal forming
Name the products at the anode and cathode during the electrolysis of NaCl
Cathode - hydrogen
Anode - Chlorine
In the electrolysis of solutions, what is produced at the anode?
Either a halogen or oxygen
In electrolysis , what types of substances can be electrolytes?
Ionic compounds that have been melted or dissolved in water
In the electrolysis of solutions, what is produced at the cathode?
If the metal is less reactive than hydrogen then the metal is produced
If the metal is more reactive than hydrogen then hydrogen is produced
Give a half equation to show the formation of oxygen at the anode during the electrolysis of a solution
4OH- —> O2 + 2H2O + 4e-
State the purpose of electrolysis
To separate compounds into elements
