Laws of chemical combinations

The combination of elements to form compounds is governed by
the following five basic laws.

(i) Law of conservation of mass

(ii) Law of definite proportion

(iii) Law of multiple proportion

(iv) Gay Lussac’s law of Gaseous volume

(v)  Avogadro’s law


  1. Law of conservation of mass:  In all physical and chemical changes, the
    total mass of the reactants is equal to that of the products. OR Matters can neither
    be created or nor be destroyed
  2. Law of define proportion:  The law states that a chemical compound always
    consists of the same elements combined together in the same fixed proportion by
  3. Law of multiple proportions: When two
    elements combine to form two or more than two compound, then the weights of the
    elements which combine with the fixed weight of the other, bear a simple ratio
    to one another.
  4. Gay Lussac’s law of Gaseous volume:  It states that when gases combine to form
    gaseous product, their volume will be in a simple whole number ratio between
    the volumes of reactants and product at a constant temperature and pressure.
  5. Avogadro’s law: It states that equal volumes
    of all gases under same temperature and pressure contain equal numbers of



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