Laws of Chemical Combination | Atoms And Molecules | Notes | Summary - Zigya

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Atoms And Molecules

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Laws of Chemical Combination

The following two laws of the chemical combination were established by Lavoisier and Joseph L. Proust.

Law Of Conservation Of Mass

In a chemical reaction, the total mass of product is equal to the total mass of the reactant.
"In other words, mass neither be created nor be destroyed in a chemical reaction."

Law Of Constant Proportions

"In a chemical substance, the elements are always present in definite proportions by mass”.

Postulates of Dalton’s atomic theory

  • All matter is made of very tiny particles called atoms.
  • Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.
  • Atoms of a given element are identical in mass and chemical properties.
  • Atoms of different elements have different masses and chemical properties.
  • Atoms combine in the ratio of small whole numbers to form compounds.
  • The relative number and kinds of atoms are constant in a given compound.

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