EASY
9th CBSE
IMPORTANT
Earn 100

How many particles are there in one mole of a substance?

Important Questions on Atoms and Molecules

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 20
Calculate the mass of 6.022×1023 atoms of copper.
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 21
State the relation between empirical formula and molecular formula.
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 22
Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 23
Which postulate of Dalton's atomic theory can explain the law of definite proportion?  
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 24
If one mole carbon atoms weighs 12 grams, what is the mass (in grams) of 1 atom of carbon?
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 25
Find the ratio by mass of the elements present in the molecule of ammonia. Given that, atomic mass: N=14 u, H=1 u. 
 
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 26
Name a compound whose empirical formula is same as the molecular formula.
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 27
State the law of multiple proportions.