Core Reactions: Redox
Slide 23 of 42
Redox reaction: examples
–Metal + Water ® Metal oxide + Hydrogen gas
•Mg (s) + H2O (g) ® MgO (s) + H2 (g)
–Metal oxide + hydrogen gas ® Metal + Water
•CuO (s) + H2 (g) ® Cu (s) + H2O (g)
–Metal oxide + carbon ® Metal + Carbon dioxide
•2Fe2O3 (s) + C (s) ® 4Fe (s) + 3CO2 (g)
•Halogen1 + metal halide ® metal halide + halogen2
•Cl2 (aq) + KBr (aq) ® KCl (aq) + B2 (l)
–I- (aq) + Cl2 (aq) ® I2 (aq) + 2Cl- (aq)
The above set of reactions are also referred to as displacement reaction for the simple fact that one of the substances takes the place of the other.
Let´s look into the oxidation state change for the first reaction.