NCERT Solutions for Class 9 Science Chapter 3
Atoms And Molecules
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-33
Questions No-3
Which postulate of Dalton’s atomic theory is the result of the law of conservation of mass?
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The postulate of Dalton’s atomic theory which is a result of the law of conservation of mass is
“Atoms are indivisible particles, which can neither be created nor destroyed in a chemical
reaction”.
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Dalton’s Atomic Theory and Conservation of Mass:
– Dalton’s Atomic Theory Postulate:
– Law of Definite Proportions: States that compounds are formed by combining elements in definite and fixed proportions by mass.
– Connection to Conservation of Mass:
– Conservation of Mass Principle: Asserts that in a chemical reaction, the total mass of the substances remains constant; mass is neither created nor destroyed.
– Correlation:
– The Law of Definite Proportions in Dalton’s theory directly stems from the Conservation of Mass principle.
– Explanation:
– Conservation of Mass implies that in any chemical reaction, the total mass of the substances before the reaction is equal to the total mass of the substances after the reaction.
– This aligns with Dalton’s idea that compounds always contain elements in fixed proportions by mass, indicating that during a reaction, the relative masses of the elements stay consistent, adhering to the principle of mass conservation.