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Answers:a polar substance is like a magnet - it has a pole, so it's impossible to be both - polar and non-polar. for example a molecule CO2 is non-polar - it is a linear molecule, but water is a polar molecule. Rule of thumb - the bigger the molecule, the more chances it is a polar one. Polar - water, detergent, alcohol, salt , (oil), sugar. Non-polar - lipid, sand.
Answers:Yes. If the bonds are polar but the molecule symmetry the "pull" on the electron pairs can effectively cancel. Carbon dioxide for example is a linear molecule. The carbon-oxygen bond is polar (EN difference of 1.0) but the pulls are equal and in the opposite directions so they cancel. In order for a molecule to be polar, there has to be at least one polar bond.
Answers:Simple. A polar molecule (assuming you re referring to a covalently-bonded molecule) is one where the electrons are shared unequally between the atoms. An example is water (H2O) the two shared electrons spend much more time with the oxygen atom because it has a higher electronegativity (affinity for electrons). A non-polar molecule is one whose charges balance out so there is no uneven sharing of electrons (this can be due to a lack of polarity in the molecule s bonds, or a symmetrical arrangement of atoms). An example of a non-polar molecule is carbon dioxide, CO2.
Answers:This explains about small, nonpolar molecules attracting the small caffeine molecules. Since flavor molecules are larger, they remain intact. http://recipes.howstuffworks.com/question480.htm http://science.howstuffworks.com/h2o.htm