Atoms and Molecules Class 9 Science - Law of Chemical Combination

Atoms and Molecules Class 9 Science - Law of Chemical Combination

A matter is something that can be divided and redivided into smaller particles till it reach to situation when further division is impossible. This smallest particle was named as parmanu. These smallest particle called as atoms.
Law of Chemical Combination
Law of conservation of mass :When you add mass of both the reactants and both the products respectively; you will notice that addition of masses of reactants is same as addition of masses of product. This is the law of conservation of mass, which states that, “ in chemical reaction , mass can neither be created nor be destroyed.”
Law of constant proportions : It states that, “ In a chemical substance all elements are present in definite proportion.
Dalton’s Atomic theory : According to dalton’s atomic theory,
Matter is made up of tiny particles called as atom.
Atoms are indivisible particle that are neither created nor destroyed; They are just rearranged during a chemical reaction.
Atoms of same element have same mass, size and chemical properties.
Atoms of different element will have different mass, different size and different chemical properties.