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

HARD

9th Manipur Board

IMPORTANT

Earn 100

Why are atoms regarded as building blocks of all matter?

Important Questions on Atoms and Molecules

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>Let us answer these:>Q 1

Name any two laws of chemical combination.

MEDIUM

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>Let us answer these:>Q 2

What law of chemical combination was given by Lavoisier.

MEDIUM

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>Let us answer these:>Q 2

What law of chemical combination was given by Proust?

HARD

9th Manipur Board

IMPORTANT

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

10.6 g

of Sodium carbonate reacted with

7.3 g

Hydrochloric acid-producing

11.7 g

of Sodium chloride,

1.8 g

of Water and

4.4 g

of Carbon dioxide gas. Show that this data verifies the law of Conservation of Mass.

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>Let us answer these:>Q 4

A pure sample of Calcium oxide contains Calcium and Oxygen in the ratio

5 : 2

by mass. How many grams of Calcium will be required to combine with

32 g

of Oxygen to form Calcium oxide?

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>Let us answer these:>Q 5

Which postulate of Dalton's atomic theory can explain Law of conservation of mass.

HARD

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>Let us answer these:>Q 5

Which postulate of Dalton's atomic theory can explain Law of Constant proportions?

EASY

9th Manipur Board

IMPORTANT

Science for Class 9>Chapter 3 - Atoms and Molecules>Let us answer these:>Q 1

Define an atom.