chemical bonds

Question 1

what are elements that do not form a chemical bond under normal conditions?

Answer 1

helium(He),neon(Ne),argon(Ar)

Question 2

why He,Ne and Ar not forming chemical bond?

Answer 2

because they have a stable electronic configuration with complete outer most shell

Question 3

what is the purpose of making chemical bonds?

Answer 3

in order to have stable nobel gas configuration

Question 4

what are chemical bonds?

Answer 4

the attractive forces or binding among the atoms or ions resulted bye the rearrangement of electrons in the valence shell for stabilizing the atoms of elements

Question 5

what are 2 types of chemical bonds?

Answer 5

ionic and covalent

Question 6

what is known as electrovalent bond?

Answer 6

ionic bond

Question 7

what is ionic bond?

Answer 7

the bonds form due to strong electrostatic attractions between positive and negative ions produced by the exchange of electrons among atoms

Question 8

how positive ions are formed?

Answer 8

when an atom remove electrons -cataions

Question 9

how negative ions formed?

Answer 9

when an atom gain electrons-anions

Question 10

what is an ion?

Answer 10

a group of atoms with electrical charges

Question 11

what is covalent bond?

Answer 11

a bond formed by sharing electrons between pair of atoms

Question 12

what is homoatomic molecules?

Answer 12

sharing of electrons between atoms of the same kind

Question 13

what is heteroatomic molecules?

Answer 13

sharing of electrons between atoms of the different elements

Question 14

what are known as electrons deficient molecule?

Answer 14

in covalent molecules the central atoms does not contains octets of electrons such molecules are known as electrons deficient molecules

Question 15

what examples for electrons deficient molecule?

Answer 15

alluminium chloride and beryllium chloride

Question 16

what are allotropes of carbon?

Answer 16

diamond and graphite

Question 17

what are properties of carbon?

Answer 17

graphite layers of carbon atoms with formed by joining of one carbon atom with three other carbon atoms
the forces holding these are weak
have a ability of conducting electricity
graphite behaves as lubricants

Question 18

what is hardest substannce in nature?

Answer 18

diamond

Question 19

what are properties of diamond?

Answer 19

diamond is a 3d lattice in every carbon atom it forms four single bonds with another carbon atom
it cannot conduct elecricity

Question 20

what is non polar covalent bond?

Answer 20

when an atoms with same or slightly different elecronegativity is joining by covalent bonds the bonding electrons between those two atoms are distributed symetrically it is known as non polar covalent bond

Question 21

what is polar covalent bond?

Answer 21

when two atoms with unequal elecronegativity joining by a covalent bond it gets polarizes due to asymmetrical distribution of electrons

Question 22

what is inercmolecular bonds?

Answer 22

attractive forces among molecules

Question 23

what is known as intermolecular bond between water?

Answer 23

HYDROGEN bonds

Question 24

why water has 100 degrees of boiling point?

Answer 24

because it is a intermolecular hydrogen bond