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L29 - The Unusual Properties of Water Water Molecular...

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    The Unusual Properties of Water 44 16 18 Molecular Weight  (g/mol) –56.6 (5.2 atm) –164 100 Boiling Point ( ° C) –78.5 ( subl ) –182 0 Melting Point ( ° C) Gas Gas Liquid State at Standard T  and P Carbon Dioxide Methane Water
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Figure 4.1 Electron distribution in molecules of H 2  and H 2 O.
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    Water in the liquid state exhibits a semi-ordered structure,  maintained by a network of hydrogen bonds between water  molecules; unlike in solid water (i.e. in ice) hydrogen bonds  in liquid water are breaking and re-forming constantly.
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Published by AAAS D. Laage et al., Science 311, 832 -835 (2006) Fig. 3. Scheme of the different steps in the computed H-bond exchange mechanism
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    In solid water (ice) hydrogen bonds are permanent.
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    Small (H 2 O) n  clusters: hydrogen bond and electrostatic  interactions between water molecules lead to formation  of small cluster in the gas phase.
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