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 Fill a glass with water above the rim. It forms a domed surface. Add a paper clip and watch it float, even though the paper clip is made of a metal that is denser than water. This is due to water's surface tension. Water has several very unique properties, like surface tension, cohesion, and adhesion because water

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... is the property of hydrogen bonding that makes the water molecule. The way that this works is that a water molecule is a polar molecule. This is because the oxygen has a larger electronegative value than the hydrogen in the water molecule. This means that the oxygen gets a bigger division of the shared electrons than the hydrogen does. This gives oxygen a very high partial negative charge, and the hydrogen a very high partial positive charge. Because of these high partial charges on each end of the molecule, they're attracted to each other. This makes a strong type of intermolecular force called a hydrogen bond. The hydrogen bond 'pulls' the water molecules towards each other. So when in the centre of a water molecule the hydrogen bonds go in every direction. But when they are on the outside of a mass of water they are attracted only by molecules inside the mass of water. This makes a layer over the surface of the water.
is polar and every water molecule electrically attracts the neighboring water molecules.