Polarity

polaryty is: in chemistry, polarity refers to a separation of electric charge leading to a molecule or its chemical groups having an electric dipole or multipole moment.

EXPERIMENT:

SurfaceTension
Because of polarity, water molecules are pulled to the middle of a volume of water. This is why a drop of water will be rounded on the surface it is dropped on, which illustrates surfacetension. To experiment with surface tension, use a penny, water and a dropper. Lay the penny on a flat surface and slowly drop water onto it. The water molecules stick together and form a convex shape on thepenny, like a bowl placed upside down. This is due to the bonding or attraction of the positive and negative hydrogen molecules found in water. Try the same with oil, which is nonpolar.
Molecules inthe Mix
Experiment on polarity and nonpolarity in a chemistry lab using a 12-well strip. Using a dropper, place 10 drops of water in seven wells. Place a few crystals of urea in one well, iodine inthe next, ammonium chloride in the third, naphthalene in the fourth, copper sulfate in the fifth, sodium chloride in the sixth and five drops of ethanol to the final well. Mix the contents of eachwith a toothpick and record your observations. Repeat the process using 10 drops of vegetable oil (a nonpolar solvent) instead of the 10 drops of water and record your observations.
Charged AttractionWater molecules have an uneven distribution of atoms, which is what makes them polar. The atoms in vegetable oil molecules are distributed evenly; this makes them nonpolar. Polar solutions, which havepositive and negative charges on either end, will be attracted to a charge. To illustrate this, charge a balloon by rubbing it against a piece of wool, or your head. Turn a water faucet on so thatthere is a steady stream and hold the balloon near the stream of water. The water will pull toward the negatively charged balloon. Place the nonpolar oil in a paper cup that has a small hole in it and...