Free CBSE Class 9 Science Unit 1-Matter - Its Nature & Behaviour Atoms and Molecules Worksheets

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Sample CBSE Class 9 Science Unit 1-Matter - Its Nature & Behaviour Atoms and Molecules Worksheet Questions

State law of constant proportions.
Which postulate of Dalton’s atomic theory is the result of the law of conservation of mass?
What is molecule?
Define one mole of substance.
Define polyatomic ion.
What is the SI prefix for each of the 10-9 and 10-6 multiples of a unit?
Define valency of an element.
What is Avogram?
Define molecular mass of a substance.
What can be interpreted if the atomic mass of an element is in fraction?

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