We observe changes in our daily life. For instance, iron rusts, wood, and needle – gas burns. Sugar dissolves in water to make solution, etc. The rusting of iron and burning of wood and Sui – gas are the chemical combinations, because in these changes new substances are formed. Sugar dissolved in water to make solution, is not a chemical combination, because sugar can be separated from the solution by evaporating water.
Laws of Chemical Combination
- Law of Conservation of Mass.
- Law of Constant Composition or Definite Proportion.
- Law of Multiple Proportion.
- Law of Reciprocal Proportion.
Law of Conservation of Mass
Lavoisier, a French chemist, performed a number of experiments on combustion reaction. He proved that when reactions were conducted in closed containers, there was no change in the total mass. The total mass of the product was always equal to the total mass of the reactants. According to this law Lavoisier 1885 concluded that,.
“Mass is neither created nor destroyed during a chemical reaction.”
