Question

Examples: Classify each molecule below as polar or non-polar. Justify your answers using 3-D VSEPR models and dipole moment vectors. CC14 CH3C1 CL2 SnCl3 H2O NO3 - To BF3 SiO2 PF:

Answer 1

Key points VSEPR theory/modele is used to predict molecular geometrics We will use the AXn Em type netation, where I A central atom X- Side atoms (or ligands) Ex lone pair On central atan dépole moment vector is Dipole Moments. In chemistry, the drawn from positive towards negative with arrow head point at Eve) charge - Stt- And, dipole moment prises due to electronegatively differences -

CCl4 Axy --telraudul x at > Hi the dipole moment vectors Caurels Out , net dipole moment is Zero, Non peler) CH₂U AXy - tetrahedral an Net Dipole (towards (I) (Polar molecule tcr HIHI ely - linear molecule a cc - No electronegativila difference (Non- (Non- Polar) No Dipole Polar Sndy Atze Siew Trigonal lyramidal ope Net dipole ( at a t Polar Molecule) - 40 - AX₂E2 OO Bent Net Dipole (Polar molecule ) +

3 - AX- trigonal Planter Net Difole moment Cancel out Non-Pokar ) Oy - AXRF - Beut Net Dipole Art & Polar Holecule - Biz - Axz - trigonal planer 1 Net dibole cancels out Non-polar ab S10 - AX – linter s o Net dipele - Cancel out . Non-polar

1 tt PFs - Axs -- trigonal Bifyramidal 1 and 2 cancels out each - other and rest of vectors forma triangular plane and Cancels since magnitude is equal but direction is opposite c. Net dipole moment zo Non-polar