Which one of the following molecules is polar? Showallworkindetails. A) BH3 B) CCl4 C) SO2 D) CO2 E) PF5

C) SO₂  

Explanation:

The figure below shows — clockwise from the upper left — BH₃, CCl₄, SO₂. CO₂, and PCl₅.

You must draw the Lewis structures of the molecules and then use VSEPR theory to figure out their molecular shape.

A) BH₃

BH₃ has a trigonal planar geometry.

It is nonpolar because of symmetry.

The bond dipole of the vertical B-H bond balances the equal and opposite resultant of the two downward-pointing B-H bonds.

BH₃ is nonpolar.

B) CCl₄

CCl₄ has a tetrahedral geometry.

The resultant of the two C-Cl bond dipoles on the right balances the equal and opposite resultant of the two C-Cl bond dipoles on the right.

CCl₄ is nonpolar.

C) SO₂

The Lewis structure shows that the central S atom has two S=O double bonds and a lone pair.

The electron pair geometry is trigonal planar and the molecular geometry is bent.

There is a net resultant of the S=O bond dipoles.

SO₂ is polar.

D) CO₂

CO₂ has a linear geometry with two C=O bonds pointing in opposite directions.

The bond dipoles cancel, so

CO₂ is nonpolar.

E) PCl₅

PCl₅ has a trigonal bipyramidal geometry.

The axial P-Cl bond dipoles cancel, as do the equatorial trigonal planar ones.

PCl₅ is nonpolar.

conduction is the transfer of thermal energy (heat in transfer) due to collisions between the molecules in the object. collisions between adjacent atoms and molecules transfer kinetic energy from the warmer to the cooler object. the objects must be in physical contact.