Today, in Chemistry, I learn that
oxidation is addition of oxygen and that reduction is removal of oxygen. An
example is ...
Lead Oxide + Carbon = Lead + Carbon
Monoxide
The lead oxide is reduced to lead
because oxygen is removed. The carbon is oxidised to carbon monoxide because
oxygen is added.
It can also be that oxidisation is
losing electrons while reduction is gaining electrons. We also review and learn
about half-equations. We also do group work where we focus one
on a solution. The solution I did is Fe(NO3)3 solution
where we draw the lab setup.
The ions that are present in the
solution is Nitrate, Iron, Hydrogen and Hydroxide.
In the negative electrode which is the
cathode, the hydrogen escape as gas while the Iron stays inside the solution.
In the positive electrode which is the
anode, the hydroxide escape as gas while the Nitrate stays inside the solution.
The half equation is...
Fe3+ + 3e- = Fe(s)
NO3- = e- +NO3
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