U1-3-2 - Molecule Polarity

Question 1

Polar molecule

Answer 1

A molecule which has a permanent dipole.

Question 2

Is water (H₂O) a polar or non-polar molecule?

Answer 2

Polar

Has a permanent dipole (positive/negative side )

Question 3

Is carbon dioxide (CO₂) a polar or non-polar molecule?

Answer 3

Non-polar

Has no permanent dipole (no positive/negative side )

Question 4

Explain the polarity of this molecule

Answer 4

Polar because it has a permanent dipole

Question 5

Carbon dioxide contains polar bonds. Why is it a non-polar molecule?

Answer 5

Because bond dipoles cancel out, so it has no permanent dipole

Question 6

Both molecules have the same shape, but only ammonia is polar. Explain why.

Answer 6

N−Cl bonds are non-polar/pure covalent.

N−H bonds are polar.

No polar bonds = molecule is non-polar