CHEMISTRY - HELP Gcse

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TrishaChou1
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#1
Report Thread starter 9 months ago
#1
b) Complete the sentence by putting a cross ( ) in the box next to your answer.
The reaction for the extraction of aluminium from its ore involves
(1)
A heating with carbon
B thermal decomposition
C reduction
D neutralisation

shouldnt A be the answer?
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epic08
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#2
Report 9 months ago
#2
I would of thought C (reduction)

Because in the reactivity series Aluminum is above Carbon so is displaced by electrolysis where Aluminum will be reduced at the cathode.

Al3+ +3e- --> Al

It's only metals below carbon in the reactivity series like zinc, iron, tin and lead that can be displaced by carbon.
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TrishaChou1
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#3
Report Thread starter 9 months ago
#3
(Original post by epic08)
I would of thought C (reduction)

Because in the reactivity series Aluminum is above Carbon so is displaced by electrolysis where Aluminum will be reduced at the cathode.

Al3+ +3e- --> Al

It's only metals below carbon in the reactivity series like zinc, iron, tin and lead that can be displaced by carbon.
isnt that extracting using electrolysis?
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epic08
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#4
Report 9 months ago
#4
Yes but when electrolysis is used aluminum is reduced in electrolysis so it will be reduction.

Have you done electrolysis yet?
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TrishaChou1
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#5
Report Thread starter 9 months ago
#5
(Original post by epic08)
Yes but when electrolysis is used aluminum is reduced in electrolysis so it will be reduction.

Have you done electrolysis yet?
yess i have but i always get confused with reduction and oxidation
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booklover1313
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#6
Report 9 months ago
#6
(Original post by TrishaChou1)
yess i have but i always get confused with reduction and oxidation
Oxidation is loss of electrons, and reduction is the gaining of electrons. So going from Al3+ to Al involves the addition of 3 electrons, and hence it is reduced
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tomedward
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#7
Report 9 months ago
#7
It should be reduction as the Al3+ is gaining electrons to become Al(s). Remember OIL RIG. Oxidation is loss of electrons, reduction is gain
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