Language of chemistry

Question 1

Blue vitriol

Answer 1

CuSO4.5H2O

Question 2

Green vitriol

Answer 2

FeSO4.7H2O

Question 3

Glauber’s salt

Answer 3

Na2SO4.10H2O

Question 4

washing soda

Answer 4

Na2CO3.10H2O

Question 5

Epsom salt

Answer 5

MgSO4.7H2O

Question 6

The smallest particle that has the capability to exist independently

Answer 6

Molecule

Question 7

The number of atoms in a molecule of an element

Answer 7

Atomicity

Question 8

Example of monoatomic molecule

Answer 8

Noble gases

Question 9

Example of diatomic molecule

Answer 9

H2, N2, O2

Question 10

Example of triatomic molecule

Answer 10

Ozone

Question 11

Example of tetratomic molecule

Answer 11

P4

Question 12

Example of octa-atomic molecule

Answer 12

S8

Question 13

Scientist who suggested that the initial letter of an element written in capitals represent that particular element

Answer 13

J J BERZELIUS

Question 14

Define valency

Answer 14

The number of electrons that an atom can lose, gain or share during a chemical reaction

Question 15

Why atoms lose or gain electrons?

Answer 15

To attain octet or duplet electronic structure

Question 16

Variable valency of Iron

Answer 16

+2 and +3

Question 17

Variable valency of Copper

Answer 17

+1 and +2

Question 18

Variable valency of Mercury

Answer 18

+1 and +2

Question 19

Variable valency of Lead

Answer 19

+2 and +4

Question 20

Variable valency of Tin

Answer 20

+2 and +4

Question 21

Variable valency of Silver

Answer 21

+1 and +2

Question 22

Variable valency of Mn and Pt

Answer 22

+2 and +4

Question 23

Variable valency of Gold

Answer 23

+1 and +3

Question 24

The element which was chosen initially as the standard unit to find relative atomic mass

Answer 24

HYDROGEN

Question 25

The element which was chosen later in 1961 as the standard unit to find relative atomic mass

Answer 25

Carbon-12

Question 26

Define relative atomic mass of an element

Answer 26

It is the number of times one atom of an element is heavier than 1/12 the mass of an atom of Carbon-12

Question 27

Define relative molecular mass of an element/compound

Answer 27

It is the number of times one MOLECULE of the substance is heavier than 1/12 the mass of an atom of Carbon-12

Question 28

Define gram atomic mass or gram atom.

Answer 28

The relative atomic mass of an element expressed in grams

Question 29

Define gram molecular mass or gram molecule

Answer 29

The relative molecular mass of a substance expressed in grams

Question 30

Atomic weights are expressed in

Answer 30

a.m.u or simple numbers

Question 31

What is the relative molecular mass of Oxygen molecule (at.mass of O=16)

Answer 31

32 amu

Question 32

What is the gram molecular mass of Oxygen molecule (at.mass of O=16)

Answer 32

32 g