3.1.3 polariation

Question 1

define electronegativity

Answer 1

the ability of an atom to attract a pair of electrons in a covalent bond

Question 2

what factors affect electronegativity

Answer 2

number of shells (atomic radius)
shielding
nuclear charge

Question 3

how do you determine if a molecule is polar

Answer 3

is there a difference in electronegativity
are the bonds the same
is the molecule symmetrical
= asymmetry means charge generally in one direction
= symmetry means dipoles cancel out

Question 4

what is a polar bond

Answer 4

when the e- between the atoms are unevenly distributed
one element is more electronegative than the other

Question 5

is NH3 polar ?

Answer 5

has polar bonds between N-H
all bonds are same
not symmetrical - has lone pair
= it is polar

Question 6

is CO2 polar ?

Answer 6

has polar bonds between C-O
all bonds are the same
symmetrical (dipoles cancel out)
= it is NONPOLAR

Question 7

is H2O polar?

Answer 7

has polar bonds between H-O
all bonds are the same
not symmetrical
= it is POLAR