Chapter 2 - Reginald H Garrett Charles M Grisham Chapter 2...

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Reginald H. Garrett Charles M. Grisham Chapter 2 Water: the Medium of Life
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Chapter 2 “If there is magic on this planet, it is contained in water.” Loren Eisley Where there’s water, there’s life.
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Essential Question What are the properties of water that render it so suited to its role as the medium of life?
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Outline What are the properties of water? What is pH? What are buffers, and what do they do? Does water have a unique role in the fitness of the environment?
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2.1 What Are the Properties of Water? Water has unusual properties: High b.p., m.p., heat of vaporization, surface tension Bent structure makes it polar Non-tetrahedral bond angles H-bond donor and acceptor Potential to form four H-bonds per water molecule
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2.1 What Are the Properties of Water? Figure 2.1 The structure of water.
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2.1 What Are the Properties of Water? A comparison of ice and water, in terms of H-bonds and Motion Ice: 4 H-bonds per water molecule Water: 2.3 H-bonds per water molecule Ice: H-bond lifetime - about 10 microsec Water: H-bond lifetime - about 10 psec (10 psec = 0.00000000001 sec) That's "one times ten to the minus eleven second"!
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2.1 What Are the Properties of Water? Figure 2.2 The structure of normal ice.
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2.1 What Are the Properties of Water? Figure 2.3 The fluid network of H bonds linking water molecules in the liquid state.
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2.1 What Are the Properties of Water? Figure 2.3 The fluid network of H bonds linking water molecules in the liquid state.
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The Solvent Properties of Water Derive from Its Polar Nature Water has a high dielectric constant Ions are always hydrated in water and carry around a "hydration shell" Water forms H-bonds with polar solutes Hydrophobic interactions - a "secret of life"
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The Solvent Properties of Water Derive from Its Polar Nature Figure 2.4 Hydration shells surrounding ion in solution.
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The Solvent Properties of Water Derive from Its Polar Nature
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Chapter 2 - Reginald H Garrett Charles M Grisham Chapter 2...

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