Science for Class 9>Chapter 3 - Atoms and Molecules>Let us answer these:>Q 6

MEDIUM

9th Manipur Board

IMPORTANT

Earn 100

Define atomic mass. What is meant by saying that atomic mass of Calcium is $40$ .

Important Questions on Atoms and Molecules

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 1

What are the postulates of Dalton's atomic theory?

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 2

3 g

of Magnesium combines with

2 g

of Oxygen to produce

5 g

of Magnesium oxide compound. If

6 g

of Magnesium is allowed to react with

20 g

of Oxygen, what mass of Magnesium oxide will be produced in the reaction? Name the law which governs your answer.

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 3

Distinguish between atom and a molecule of an element.

MEDIUM

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 4

Define atomic mass unit.

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>EXERCISES>Q 5

Why are atoms regarded as building blocks of all matter?