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REDOX REACTION
An oxidation-reduction (redox) reaction is a type of chemical
reaction that involves a transfer of electrons between two species.





Which atom is
oxidized & which
atom is reduced?



OXIDATION NUMBER
The oxidation state/number of an element corresponds to the number of
electrons, that an atom loses, gains, or appears to use when joining with other
atoms in compounds.

0


Group 1a



Group 2a



halogens


H

O

F


0














Zn + 2H+ →Zn2+ + H2


half-reaction:


half-reaction:












HALF REACTION


HALF REACTION


Assign the oxidation numbers to determine which
specie is oxidized and which is reduced, as well as to
identify the reducing and oxidizing agents. Don’t forget
to write the corresponding half-reactions.