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Properties & Uses of Aluminium

The following...

Question

The following questions are relevant to the extraction of aluminium:
Give a balanced chemical equation for the above reaction?

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Solution

$A l_{2} O_{3} .2 H_{2} O + 2 N a O H \to 2 N a A l O_{2} + 3 H_{2} O$
This reaction is used for the purification of ore.

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Question 20.1

Write the balanced chemical equation for the following reaction and identify the type of reaction.

Thermit reaction: Iron (III) oxide reacts with aluminium and gives molten iron and aluminium oxide.

$B a r i u m C h l o r i d e + A l u m i n i u m S u l p h a t e \to B a r i u m S u l p h a t e + A l u m i n i u m C h l o r i d e$

Which of the following options correctly represents the balanced chemical equation for the above reaction?

$B a r i u m C h l o r i d e + A l u m i n i u m S u l p h a t e \to B a r i u m S u l p h a t e + A l u m i n i u m C h l o r i d e$

Which of the following options correctly represents the balanced chemical equation for the above reaction?

Q. The following is an extract from 'Metals in the Service of Man, Alexander and Street/Pelican 1976':
'Alumina (Aluminium oxide) has a very high melting point of over 2000 C so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance'.
(a) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the balanced chemical equation for this reaction.
(c) Name the element which serves both as anode and the cathode in the extraction of aluminium.
(d) Write the balanced chemical equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(e) Give the balanced chemical equation for the reaction which occurs at the anode when aluminium is purified by electrolysis.

Q. (a) What is a balanced chemical equation? Why should chemical equations be balanced?
(b) Aluminium burns in chlorine to form aluminium chloride (AlCl₃). Write a balanced chemical equation for this reaction.
(c) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. Write a balanced chemical equation for this reaction.

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