number 6 and 7 only The extraction of aluminiumThe diagram shows the electrolysis of alumina (aluminium oxide) purified from bauxite.graphteanodesgraphite Inng(cahode)dc applysold crustkrming onminturealuminiumoidedsobedhayoltemotenaluminium3 a What is the formula for aluminium oxide?b What ions are present in aluminium oxide?c What is the purpose of the cryolite in the process?4 Write down half-equations for the processes occurring during electrolysis at:a the anode: .b the cathode:5 Complete the two statements.a Oxidation (.b Reduction (.6 The graphite anodes have to be replaced regularly. Why is this?7 Why is it so much more cost-effective to recycle aluminium than to extract new aluminium?- of electrons) occurs at the.... of electrons) occurs at the .

Bauxite is a sedimentary rock and it is the ore of Aluminum. The chemical composition of bauxite is…

Answered: 6 The graphite anodes have to be…

6 The graphite anodes have to be replaced regularly. Why is this? 7 Why is it so much more cost-effective to recycle aluminium than to extract new aluminium?

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter18: Electrochemistry

Section: Chapter Questions

Problem 119AE: The black silver sulfide discoloration of silverware can be removed by heating the silver article in...

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Concept explainers

Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electrolyte, electrodes, and some form of external power source are the main components required for conducting electrolysis. A partition, such as an ion-exchange membrane or a salt bridge, may also be used, but this is optional. These are primarily used to prevent the products from diffusing near the opposing electrode.

Question

number 6 and 7 only

The extraction of aluminium
The diagram shows the electrolysis of alumina (aluminium oxide) purified from bauxite.
graphte
anodes
graphite Inng
(cahode)
dc apply
sold crust
krming on
minture
aluminium
oide
dsobed
hayolte
moten
aluminium
3 a What is the formula for aluminium oxide?
b What ions are present in aluminium oxide?
c What is the purpose of the cryolite in the process?
4 Write down half-equations for the processes occurring during electrolysis at:
a the anode: .
b the cathode:
5 Complete the two statements.
a Oxidation (.
b Reduction (.
6 The graphite anodes have to be replaced regularly. Why is this?
7 Why is it so much more cost-effective to recycle aluminium than to extract new aluminium?
- of electrons) occurs at the.
... of electrons) occurs at the .

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