ELELCTRONEGATIVITY AND POLARITY

Question 1

Electronegativity is

Answer 1

The ability of an atom to attract electrons in a covalent bond .

Question 2

pauling values are

Answer 2

used to compare electronegativity

Question 3

electronegativity increases

Answer 3

!. going up a group
2. across a group

Question 4

differances in electronegativity (3)

Answer 4

!. if the differance is less than 0.5=NON POLAR COVALENT BOND
2.if the differnace is between 0.5-2.7= POLAR COVALENT BOND
3.If the differance is above 2 = IONIC BOND

Question 5

Electromegativity increases across a period due to

Answer 5

1. charge on the nucleus
2. increased attraction for the outer electron

Question 6

electronegativity increases u a period due to

Answer 6

1. number of shells increasing
2. distance of the outer electrons from nucleus increases

Question 7

Dipole means

Answer 7

a bond or molecule whose poles have opposite charges

Question 8

polar bond

Answer 8

two bonding atoms are different air of electrons are distributed unequally

Question 9

Non-polar bond

Answer 9

two bonding atoms are identical and electrons are equally distributed

Question 10

H20 Is a

Answer 10

polar molecule due to the ermanent dipole

Question 11

CO2 is a

Answer 11

Non-polar molecule containing a permant dipole

Question 12

non-symetrical molecule properties

Answer 12

1. a differnece in charge exists across the molecule
2. overall dipole (slight differance in charge)
3. the molecule is polar

Question 13

Symetrical molecule properties

Answer 13

!. the symmetry of the molecule means the effect of the permanent dipole is cancelled
2. linear,trigonal planar and tetrahedral are all symetrical structures
3. all atoms are Non-polar

Question 14

Permanent dipole

Answer 14

dipole in a polar covalent bond which does not change

Question 15

molecules are non-polar if

Answer 15

symmetricla

Question 16

molecules are polar if

Answer 16

asymmetrical

Question 17

Intermolecular forces

Answer 17

Are weak attractions between dipoles of different molecules

Question 18

Intermolecular forces are responsible for

Answer 18

Physical properties ( melting and boiling point )

Question 19

Bond enthalpy

Answer 19

Amount of energy required to break the covalent bond

Question 20

London forces

Answer 20

Are weak intermolecular forces that act between induced dipoles .

Question 21

In London forces the movement of electrons

Answer 21

Produces a changing dipole in a molecule . The position is constantly changing

Question 22

In London forces the more electrons in each molecule

Answer 22

Produces a larger instantaneous dipole