State some of the chemical properties of metals cbse class8 chemistry 2015
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State some of the chemical properties of metals. cbse-class8-chemistry-2015

cbse-class8-chemistry-2015


By:Fututron

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Reaction with oxygen:-
  1. Metals react with oxygen to form metallic oxides. These are basic oxides because they react with water to form bases. E.g. Magnesium burns in air to form magnesium oxide.Magnesium reacts with water to form magnesium hydroxide.
    2 Mg + O2 ---> 2 MgO MgO+ H2O ---> Mg(OH)2
  2. Reaction with water:-
    Metals react with water to form metal hydroxides and hydrogen.
    Eg. Sodium reacts with water to form sodium hydroxide and hydrogen.
    2 Na + 2 H2O ----> 2 Na OH + H2
    Magnesium reacts with water to form magnesium hydroxide and hydrogen.
    Mg + H2O ----> Mg(OH)2+ H2
  3. Reaction with acids:-
    Metals react with acids to form metallic salts and hydrogen.
    Eg. Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen.
    Zn + 2 HCl ----> ZnCl2+ H2
  4. Metals replace metals:-
    A more reactive metal replaces a less reactive metal from its salt solution.
    Eg. Magnesium replaces copper from copper sulphate solution to form magnesium sulphate and copper.
    Mg + CuSO4 ----> MgSO4+ Cu
    Zinc replaces copper from copper sulphate solution to for zinc sulphate and copper.
    Zn + CuSO4 ----> ZnSO4 + Cu

13priya

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