Chemistry - Chemical Bonding - Polar and non-polar molecules - Polar or Non-polar?

Sort 12 molecules into 'POLAR' or 'NON-POLAR'. 1) H₂O (Polar - bent, polar bonds don't cancel). 2) CO₂ (Non-polar - linear, bonds cancel). 3) NH₃ (Polar - pyramidal). 4) CH₄ (Non-polar - symmetric tetrahedral). 5) HCl (Polar - only one bond, must be polar). 6) O₂ (Non-polar - same atoms, no EN diffe