Define atomicity.

Important Questions on Atoms and Molecules

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 3

Define relative molecular mass.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 4

A compound has the chemical formula ${\mathrm{MnO}}_2$ . Answer the following questions:
a. Name the elements present in this compound.
b. Name the compound represented by the formula.
 

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 5

What is the value of Avogadro's number? What would be the mass of one Avogadro's number of nitrogen atoms? 
 

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 6

What is the mass of carbon that will be present with $8 \mathrm{g}$ of oxygen in ${\mathrm{CO}}_2$? 

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 7

What is the mass of oxygen which will be present with $6 \mathrm{g}$ of carbon in ${\mathrm{CO}}_2$? 

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 8

State law of conservation of mass.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 8

State law of constant proportions.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 3 - Atoms and Molecules>Practice Questions>Q 9

Identify the postulates of Dalton's atomic theory which are no longer supported by the modern knowledge of nature of matter.