Atoms and Molecules

Question 1

Law of conservation of Mass was given by

Answer 1

French Chemist Antoine Lavoisier

Question 2

Law of conservation of Mass states that

Answer 2

Mass can neither be created nor destroyed in a chemical reaction

Question 3

Law of Constant Proportion/Definite Composition was given by

Answer 3

French chemist Joseph Louis Proust

Question 4

Law of Constant Proportion states that

Answer 4

A pure chemical compound always consists of the same elements combined together in a fixed proportion by mass

Question 5

Drawback of Dalton’s Atomic theory

Answer 5

It states that atoms are not divisible, however atoms can be divided into subatomic particles - electrons, protons and neutrons

Question 6

Term atom was coined by

Answer 6

Democritus

Question 7

Atomicity is the

Answer 7

Total number of atoms constituting a molecule

Question 8

Monoatomic molecules are

Answer 8

Molecules found in the free state in their atomic form. These molecules contain single atom in them

Question 9

Diatomic molecules are

Answer 9

Molecules that contain two atoms (Atomicity is 2)

Question 10

Polyatomic molecules are

Answer 10

Molecules that have more than two atoms in them

Question 11

Valency of an element is the

Answer 11

Combining capacity of that element

Question 12

Valency of an ion is defined as

Answer 12

The units of positive or negative charge present on that ion