150-02water[1] - Foundations of Biological Science I...

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Foundations of Biological Science I (BioSci 150) C All of the properties of water are based on its polar covalent structure, and its ability to H-bond with itself and other molecules. .. δ - δ + δ + The Properties of Water
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Foundations of Biological Science I (BioSci 150) C In ice, water molecules form a crystal lattice. Why Ice Floats: water contracts down to 4 o C but then expands down to 0 o C, fixing the length of H-bonds in ice. The fixed H-bond length in crystaline water is longer than the average H-bond length in liquid water. Therefore liquid water at 4 o C is denser than ice. Water molecules in liquid state do not form a crystal lattice with fixed bond distances.
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Foundations of Biological Science I (BioSci 150) C As a result, ice floats. .. Figure 2.27c Because ice is buoyant (floats) in water, life continues under the ice!
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Foundations of Biological Science I (BioSci 150) C δ + δ + δ + δ - δ + δ + δ + δ + δ + δ + δ + δ + δ + δ + δ + δ + δ + + Cl - δ + δ - δ
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150-02water[1] - Foundations of Biological Science I...

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