Core
Reactions: Redox
Slide 22 of 42
Redox reaction:
examples
Some simple reactions can be easily
identified as a redox reaction and they are:
1.Reactions that involve
formation of a compounds from its constituent elements, or the
reverse, decomposition into elements.
2Na (s) + Cl2 (g) ® 2NaCl(s) C
(s) + O2 (g) ® CO2 (g)
2HgO(s) ® 2Hg (s) + O2 (g)
–Notice
that the oxidation numbers change in going from the elemental state to the combined
state.
2. Displacement reactions.
Metal1 + Metal2 salt
solution ® Metal1
salt solution + Metal2
Zn (s) + CuSO4 (aq) ® ZnSO4 (aq) + Cu (s)
Metal + Acid ® Metal salt solution +
Hydrogen gas
Mg (s) + 2HCl (aq) ® MgCl2 (aq) + H2 (g)
Metal + Water ® Metal hydroxide +
Hydrogen gas
2Na (s) + 2H2O (l) ® 2NaOH (l) + H2 (g)