Lakhmir singh solutions chemistry class 9 Solutions for Chapter 3 atoms and molecules

Exercises in Chapter 3 atoms and molecules Grade 9

Atoms and Molecules - Exercise

Questions in Atoms and Molecules - Exercise

Write the full form of IUPAC.

Name the scientist who gave:

(b) Law of constant proportions

Name the law of chemical combination:

(a) Which was given by Lavoisier

Name the law of chemical combination:

(b) Which was given by Proust

Name the scientist who gave atomic theory of matter.

Which part of the Dalton’s atomic theory came from the law of constant proportions given by Proust?

Which ancient Indian philosopher suggested that all matter is composed of very small particles? What name was given by him to these particles?

Name any two laws of chemical combination.

‘If 100 grams of calcium carbonate(whether in the form of marble or chalk) are decomposed completely, then 56 grams of calcium oxide and 44 grams of carbon dioxide are obtained’. Which law of chemical combination is illustrated by this statement?

What are the building blocks of matter?

How is the size of an atom indicated?

Name the unit in which the radius of an atom is usually expressed.

‘If 100 grams of pure water taken from different sources is decomposed by passing electricity, 11 grams of hydrogen and 89 grams of oxygen are always obtained’. Which chemical law is illustrated by this statement?

Write the relation between nanometer and meter.

The radius of an oxygen atom is 0.073 nm. What does the symbol ‘nm’ represent?

Name the scientist who gave:

(a) Law of conservation of mass