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Polar molecule is defined as a molecule in which the positive charges in the centroid are different from the centroid of the negative charges. In every molecule, the atoms are arranged geometrically. The arrangement in molecules is such that the positive charges are on one side, and the negative charges are on the other side. If this should be the case, then such a molecule is known as a polar molecule. |
In a nutshell, a polar molecule has electrical charges or poles. If such is not the case and the positive and negative do not face each other, then it is called a non polar molecule. The molecules are determined to be polar or non polar when they are mixed to form a solution and they do not mix very well.
Chemical bonding is the result of a process where atoms share their electrons with another atom and that is how they form bonds. Some examples of polar molecules are water, and some gases. A water molecule is a classic example because it has positive electrons in oxygen to one side and it has a lack of positive electrons in the hydrogen side. Some times the same may be the opposite case where hydrogen has excess positive molecules and the oxygen has less. However, you will find either on the opposite sides. Some of the gases also have a polar nature like ammonia, sulfur dioxide and hydrogen sulfide. A non polar molecule has electrons which are spread in a more symmetrical manner compared to the electrons in a polar molecule.
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