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Properties of Water

Properties of Water. 1. Polarity -. Polar molecules have a positive (+) and a negative (-) side. In water, the Hydrogen is positive and the Oxygen is negative. 2. Cohesion -. The positive hydrogens are attracted to the negative oxygen of a neighboring water molecule.

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Properties of Water

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  1. Properties of Water

  2. 1. Polarity - Polar molecules have a positive (+) and a negative (-) side. In water, the Hydrogen is positive and the Oxygen is negative.

  3. 2. Cohesion - The positive hydrogens are attracted to the negative oxygen of a neighboring water molecule. The molecules are held together by these Hydrogen bonds.

  4. Examples of Cohesion: • The shape of raindrops • Water beading up on a newly polished car • The convex surface of water when a container is filled to nearly overflowing • Surface tension – an organism can walk on water if it doesn’t break the hydrogen bonds holding the water molecules together. (water strider, basilisk)

  5. 3. Adhesion - Because water molecules are polar they stick to other substances. Ex:water sticks to the side of the graduated cylinder forming a meniscus

  6. The volume is read from the bottom of the meniscus.

  7. 4. Capillarity - Water moves up narrow tubes by a combination of adhesion and cohesion. This is how water gets from the roots to the leaves.

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