examples of polar and nonpolar molecules

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Question:Can something be both polar and nonpolar? If so, can you give some examples and maybe tell me which of these things are polar or nonpolar, or both: water, oil, orange lipid, detergent, alcohol, salt, sugar, sand.

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.

Question:is it possible to have a polar molecule that is made of nonpolar bonds? please explain why

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.

Question:A straight fast and Easy answer; What is the difference between a polar and nonpolar molecule

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.

Question:I'm teaching at an elementary school tomorrow with a fun tie-dye experiment. I need to explain that nonpolar molecules, such as rubbing alcohol, can dissolve other nonpolar molecules, such as permanent marker ink. But the marker ink can't be dissolved by polar molecules, such as water. Does anyone have a good analogy, or example younger kids (grades 1-4) experience in their daily life? Like, something that works when two things are the same, but when one thing is changed to be its opposite, it doesn't work anymore. Thanks!

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

From Youtube

Polar and Non-Polar Molecules :Tells how to decide if a molecule is polar or non-polar