Thursday, May 19, 2011

Chemical Bonding

Chemical bonding is molecules and atoms being attracted to each other and this allows them to combine to form chemical compounds.

There are 3 types of bonding:

Ionic Bonding: Is the transfer of atoms to form positive or negative ions.
Non-Polar Covalent Bonding- Is the unequal sharing of electrons
Polar Covalent Bonding : sharing of electrons equally.

IONIC:

Ionic bonding involves metal and non-metals. The force that powers ionic bonding is called the electrostatic force, which is the attraction or repulsion of charged particles. Electronegativity is also an important concept behind this bonding. Metal electronegativity is low and non metal electronegativity is high. As result, a high ionization energy is created. To determine how electrons are shared, electronegativity difference must be found.

ENeg Diff= ENeg 1 - ENeg 2
ENeg Diff  less than 0.5 it is a non polar
ENeg Diff greater than 0.5 and less than 1.8 is is polar covalent bond
 ENeg Diff greater than 1.8 is it ionic

Polarity: is the electrical balance or imbalance of the molecule. If the molecule is electrically unbalanced, then it is polar. This is caused by electronegativity. If the EN is high, the shared electrons will be pulled more to the atom. A partial negative results from high electronegativity and a partial positive results from a  low one.


In a Non- polar bond, it is one of the simplest, only involving the sharing of electrons to create full valence shells. Intramolecular forces in the molecule hold the atoms of the molecule together.
However, intermolecular forces act between molecules and are responsible for bonding.

A London force is a weak intermolecular force. They occur because of temporary dipolar attractions. A dipole is when one side is slightly positive and the other side is slightly negative ,creating partial separation.



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