Question

plss send me some extra questions with answers of chemistry ch 3 atoms and molecules (ncert) class 9
jo aapko lagta h ki they will come definitely vo send karna​

Answer 1

Explanation:

गाड़ी वाला आया घर से कचरा निकाल गाड़ी वाला आया घर से कचरा निकाल

Answer 2

Answer:

Question 1.Name two scientists who established the laws of chemical combination?

Answer: Antoine L. Lavoiser and Joseph L. Proust.

question 2. Define atomic mass unit.

Answer: Atomic mass unit of an element is one twelfth (1/12th) of the mass of one atom of carbon-12.

question 3.Why are Dalton’s symbols not used in chemistry?

Answer:Dalton was the first scientist to use the symbol for the name of the elements in a specific sense but it was difficult to memorise and in use, so Dalton’s symbols are not used in chemistry.

question 4. Which postulate of Dalton’s Atomic theory is the basis of law of conservation of mass?

Answer: “Atoms can neither be created nor destroyed a physical or a chemical change