Properties of Water Review

1. Properties of Water Accelerated Biology December 2009

2. Nonpolar Molecules Covalently bonded Electrons equally shared Atoms – similar size

3. Polar Molecules Covalently bonded Electrons not shared equally Atoms – unequal sizes Charged ends ( + / - )

4. Hydrogen Bonds Weak attractions between polar molecules. Attraction between + and – ends. Short-term (few trillionths of a sec). Break & reform constantly.

8. Nonpolar & Nonpolar = Solution (oil & gasoline)

10. Both Polar & Nonpolar substances

11. Water (attractive forces at work) Cohesion Water sticks (H-bonds) to other water molecules. Adhesion Water sticks (H-bonds) to other molecules or substances other than water.

15. Surface tension cohesive forces between liquid molecules surface acts as a plastic sheet.

18. Additional Important Characteristics of water