POLARITY RELATED TO
PROPERTIES OF MOLECULES
MOLECULAR POLARITY
is
one of the most important
consequences of molecular
geometry influences physical,
chemical, and biological
behavior of substances
Molecular
structure affects the
properties of a substance and how it
interacts with other chemicals
substances .Chemistry design drugs
that could inhibit the action of some
pathogenic viruses and bacteria . An
example of this is the antiviral drug
Tamiflu.
There are several geometrical shapes
of molecules . For example,AB2
molecule can be linear or bent
LINEAR
BENT
There are several shapes for AB3 molecules
like the ones below.
.
pyramid
Trigonal planar
T-shaped Trigonal
pyramaid
1.H2O is an AB2 molecule with a bent geometry
.Water is polar
BENT MOLECULAR GEOMETRY
An of bent molecular geometry that results from
tetrahedral electron pair geometry is H2O.
The water molecule is bent molecular geometry example
because the lone electron pairs, although still exerting
influence on the shape, are invisible when looking at
molecular geometry. The molecule is two dimensional and
bent as opposed to the beryllium hydride case which was a
linear or straight line molecular geometry because it did not
have a lone electron pair.
2.CO2 is an AB2 molecule with a linear geometry. The
bonds in CO2 are polar but the molecule is nonpolar.
 LINEAR MOLECULAR GEOMETRY
In tis example, CO2, carbon at the center with no lone
electron pairs. The carbon and both oxygen are bound through
double bounds which counts as ‘‘two electron pairs’’. Hence the
molecule has two electron pairs and is linear.
Carbon dioxide is the major product of all combustion
reactions involving carbon based materials such as natural gas,
gasoline, and coal. Carbon dioxide is the end product of
animal/human metabolism/respiration. It is also the gas that
provides the carbonation in soda and beer.
3. NH3 is an AB3 molecule with a
Trigonal pyramidal geometry
 TRIGONAL PYRAMID MOLECULAR GEOMETRY
Ammonia an example of trigonal pyramid molecular
geometry is NH3. The nitrogen has 5 valence electrons and
thus needs 3 more electrons from 3 hydrogen atoms to
complete the octet. The three hydrogen atoms and the lone
electron pair as far as possible at nearly 109 degrees bond
angle. This is tetrahedral electron pair geometry.
The lone electron pairs exerts a little extra repulsion
on the 3 bonding hydrogen atoms to create a slight
compression to a 107 degree bond angle
4.BH3 is an AB3 molecule with Trigonal
planar geometry.
TRIGONAL PLANAR GEOMETRY
Boron hydride an example of trigonal planar electron
pair geometry is BH3.This molecule is electron and does not
follow the octet rule it has only 6 valence electrons. The
hydrogen atoms are as possible at 120 degree. This trigonal
planar geometry. The molecule all in a plane and is two
dimensional.
This molecule exists in a gaseous state in only minute
quantities under specialized condition as an intermediate in the
making of other boron hydride type molecules.
LESSON LEARNED

Geometry of a molecule influences the physical,
chemical, and biological properties of a
substance.

There are several geometrical shapes of
molecules. Some them are following;

AB2 molecules which are either linear or bent

AB3 molecules which can be trigonal planar , Tshaped, or trigonal pyramid
THE END…..
Thank you
PREPARED BY; Enrico C. Pescasio Jr.
Cristy Rose
Almodiel