Why is water so important to life?

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The Importance of Water

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Presentation transcript:

Why is water so important to life?

Extraordinary Properties of Water Cohesion Water molecules stick together Surface tension Adhesion Water molecules cling to other solids capillarity

Extraordinary Properties of Water High Specific Heat Amount of heat that must be absorbed for 1g to change 1o C for water = 1.00 cal/g/oC Sp Heat of common liquids Liquid SpHt (cal/g/oC) Ammonia 1.23 Water 1.00 Eth alc 0.60 Acetone 0.53 Olive oil 0.47 Mercury 0.03

Extraordinary Properties of Water High Heat of Vaporization (change from liquid to gas) Quantity of heat a liquid must absorb for 1g to be converted to the gas state for water = 576 cal/g Ht of Vap of some liquids Liquid Ht Vap (cal/g) Water at 37C 576 Ammonia 302 Eth alcohol 237 Acetone 125 Mercury 59

Extraordinary Properties of Water Water Expands when freezing Ice Floats! Water is most dense at 4oC, and expands just a bit to form ice crystals

Extraordinary Properties of Water Water is a versatile solvent Ionic compounds dissolve in water Covalent compounds rich in O or N dissolve in water

Extraordinary Properties of Water Adhesion and Cohesion High Specific Heat High Heat of Vaporization Expands when freezing Versatile Solvent

How does water do all this How does water do all this? What allows water to facilitate life at the cellular and global level?

Hydrogen Bonds A weak force of attraction between the H on one molecule and a highly electronegative atom on another molecule

Extraordinary Properties of Water Versatile Solvent-------due to polarity Adhesion and Cohesion---due to H bonds High Specific Heat --------due to H bonds High Heat of Vap. ---------due to H bonds Expands when freezing ---due to H bonds

Ahh, water!