Apolar - Apolar

The apolar molecules are those molecules that are produced by the union between atoms that have the same electronegativity , so the forces with which the atoms that make up the molecule attract the electrons of the bond that are equal. A molecule is polar when one end is positively charged and the other is negatively charged. When a molecule is apolar, these charges do not exist. [ 1 ]

The term hydrophobic is often used for an apolar substance, due to the similarity of behaviors: a hydrophobic is one or that which repels or hates water [ 2 ] and non-polar substances do not dissolve in water despite being liquid (such as the oil ). Water is a polar solvent , [ 3 ] and therefore can only house polar molecules . This is based on the fact that at microscopic levels, something dissolves in a substance when molecular bridges appear between the solvent and solute particles . These bridges (orintermolecular forces ) appear between the areas with different charges in both substances. Water is a polar molecule (it has two areas with different charges, positive and negative) and whatever you want to dissolve in it, it must be polar, in order to establish such bonds.

Nonpolar molecules

Apolar molecules are made up of nonmetal atoms joined by covalent bonds , provided that there is no significant electronegativity difference between them . In practice, apolar molecules can be:

Offset printing technology

In the hydrophobic areas of the plate image, water is repelled, being the ink that adheres to these areas, since the offset printing system is based on a water-ink balance.


  1. Chemistry. Specific Test. University Access Test for Seniors ... , p. 99, in Google books
  2. ^ Montés, Fernando Jordán (2013). The universe of insects . Mundi-Press Books. ISBN 9788484766384 . Retrieved January 29, 2018 .
  3. ^ Weininger, Stephen J .; Stermitz, Frank R. (1988). Organic chemistry . Reverte. ISBN 9788429175271 . Retrieved January 29, 2018 .