Lectures 5 Water and pH

Lectures 5 Water and pH - Water: The Molecule That Supports...

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Water: The Molecule That Supports Life Life evolved in water All living organisms require water more than any other substance Most cells are surrounded by water, and cells themselves are about 70–95% water
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Water has three important properties that have made it the molecule that supports life 1. Cohesive behavior 2. Ability to moderate temperature 3. Versatility as a solvent All three are directly related to the capacity of water molecules to form multiple hydrogen bonds
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1. Cohesive behavior: a good example of the importance of this property is water transport in plants, moving against gravity
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2. Ability to moderate temperature: water can absorb or release considerable energy (heat) without changing states. So, water acts as a heat sink allowing cells and organisms to regulate their temperature        solid liquid gas
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3. Versatility as a solvent: Dissolves hydrophilic (polar or charged) molecules and substances) Converse: expels hydrophobic (nonpolar) molecules and substances, makes it possible to form membranes
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Lectures 5 Water and pH - Water: The Molecule That Supports...

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