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Question from Claire |
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Ask a Teacher - Chemistry - Formulae and Equations - A Question from Claire |
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| Student Name |
Claire |
| Question |
What are the ion-electron equations for chlorine and copper?
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| Answer |
Ion-electron
equations are in the SQA data book , p.7- The equations are written
as reductions (gain of electrons ) but can be reversed to give the
oxidation equation. The substance reacting must always be on the
left of the arrow:-
Eg If chlorine is reacting the equation is Cl2 + 2 e
 2Cl-
If the chloride ion is reacting, reverse the equation 2Cl-
Cl2
+ 2e
If the copper(11) ion is reacting the equation is Cu2+
+ 2e
Cu
If copper metal is reacting, reverse the equation Cu
Cu2+ + 2e
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