GCSE revision (WW) - Phoenix Hoyle | Library

4

 Electrolysis plays an important part in extracting some metals from their ores and in purifying others.

a) Define what is meant by the term electrolysis. 
Electrolysis is __________________  of a substance using a ___________  electric current 
b) Name one metal which is obtained from its ore by electrolysis. 
Any metal that is __________ carbon in the reactivity series.
For instance ______________ 
https://www.focuselearning.co.uk/s/4cre8k45a2ix Simulation to predict the products of electrolysis.

Other Answer Choices:

Silver

Gold

aluminium

direct

decomposition

below

above

1

Write balanced, ionic equations to show the electrode reactions which occur when copper is purified. 
At the anode (where ______________  takes place) (Impure copper)
Cu → Cu²⁺ + 2e⁻ 
At the cathode (Where ______________  takes place) (pure copper)
Cu²⁺ + 2e⁻ → Cu 
https://www.focuselearning.co.uk/s/1jstzoplah30 Focus education simulation. 

Other Answer Choices:

oxidation

reduction

6

The particles that are responsible for the conductivity of electricity in metals are the (delocalsied) ______________ 
The particles that are responsible for the conductivity of electricity in ___________  or aqueous ionic compounds are  _________ 
The electrolysis of dilute sulphuric acid using inert electrodes produces two gases as products. 
At the cathode 
2H⁺ + 2e⁻ → H₂ ______________ 
At the anode
4OH⁻ → 2H₂O + O₂ ______________ 
Name a material which could be used as the inert electrodes in this experiment.  
_____________  

Other Answer Choices:

solid

ions

molten

electrons

Graphite

reduction

oxidation

5

The term is used to describe a reaction which gives out heat is _______________ .
When drops of water are added to anhydrous copper sulphate heat is given out _______________ and the solid turns _________ 
The anhydrous copper sulphate can be heated to remove the water of hydration so this reaction is an example of a _______________  reaction. https://www.focuselearning.co.uk/s/4wyjvlrqy7sj
The forward and reverse reactions are not, however, both occurring at the same rate so this is not an example of ____________  equilibrium. https://www.focuselearning.co.uk/s/40aaubdwqxw0

Other Answer Choices:

blue

dynamic

Exothermic

reversible