REACTIVITY SERIES OF METAL
Metal + Water → Metal hydroxide + Hydrogen
Ca (s) + 2H2O (l) → Ca(OH)2 (aq) + H2 (g)
Calcium + Water → Calcium hydroxide + Hydrogen
Reaction 2: Metal + Acid
Metal + Acid → Salt + Hydrogen
2K (s) + 2HCl (aq) → 2KCl (s) + H2 (g)
Potassium + Hydrochloric acid → Potassium chloride + Hydrogen
The reactivity of metal decreases going down the reactivity series
REACTION 1 METAL + METAL OXIDE
REACTION 2 METAL + AQUEOUS SOLUTION OF METAL SALTS
RUSTING OF IRON
METHOD 1 BARRIER METHOD
METHOD 2 GALVANISING
METHOD 3 SACRIFICIAL CORROSION
Example: ships’ hull
In terms of gain or loss of oxygen and loss or gain of electrons.
REDOX REACTION (IN TERMS OF ELECTRON)
Zn → Zn2+ + 2e–
Cu2++ 2e– → Cu
METHODS
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