bonding and structure

Question 1

how can presence of polar bond be explained by electronegativity

Answer 1

one element attracts bonded pair more/is more electronegative

Question 2

whys nacl soluble

Answer 2

as water is polar and the ions interact with water molecules.

Question 3

Explain how van der Waals’ forces are formed.

Answer 3

uneven distribution of electrons
instantaneous /oscillating/changing/temporary/transient/
dipole on one atom
causes an induced/resultant dipole on another
molecule/atom