Polarity
Water is composed of one oxygen atom
and two hydrogen atom. This is a simple molecular
structure made up of covalent bonds. These bonds
are better defined as a hydrogen bond, which is
the strongest bond relative to the other types of
polarization bonds such as Van Der Waals, ion-ion
bond, and other non-covalent bonds. "Water is not
a simple liquid. It possesses strongly polar
hydrogen bonds which are responsible for a
striking set of physical and chemical
properties[...]" (Robinson). When atoms have a
covalent bond that means the atoms are sharing
electrons to reach a more stable state.
Since water has a oxygen that
has a bonding charge of -4 because its four
electrons orbiting the nucleus of the oxygen atom.
Hydrogen has a bonding charge of +1 because a
hydrogen atom simply acts as a proton, which has a
positive charge. With an H2O molecule there is a
partial net -2 charge on it so that means the
molecule is polar. A polar molecule, for example,
acts like a magnet. Where there is a magnetic
negative and positive side to a magnet, there is a
similar distribution of positive and negative
charges on a polar molecule. Because there are
these opposite forces, the negative side of one
water molecule will attract the positive side of
another water molecule, and the two water
molecules together will attract more water
molecules. That is what causes the attractive
forces of a water molecule and why water sticks to
itself so well. This phenomena is described as
Cohesion.
http://www.umass.edu/microbio/chime/pe2.79/pe/atlas/morphs/water10/index.htm
Cover Page
Phase Changes
Cohesion
& Adhesion
Water & Light
Bibliography
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