Structure of Water - I Structure of Water Number of linked molecules decreases with increasing temperature because increase of kinetic energy make

Structure of Water - I Structure of Water Number of linked...

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I. Structure of Water - Number of linked molecules decreases with increasing temperature because increase of kinetic energy make hydrogen bond formation more difficult - 4-8 molecules per group in liquid water - Ice – hexagonal arrangement o Empty account for the lower density o Heat causes molecules to move and vibrate o Melting point is reached – energy of molecules breaks down into liquid water o Critical temperature – temperature above the substance cannot exist in the liquid state For water = 373.99 ° C o Critical pressure - the lowest pressure at which the substance can exist as a liquid at critical temperature For water = 217.75 atm - Below triple point, temp of sublimation decreases with decreasing pressure
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Unformatted text preview: *** II. Physical Properties of Water-Water freezes at 1 atm (101.325 kPa) and melts at 0 ° C o Molar heat fusion of ice: 6.009 kJ/mol o Ice density: 0.917g/cm^3 -Water boils at 100 ° C o Molar heat of Vaporization: 40.79 o Water density: 0.999 84 g/cm^3 o Strong hydrogen bonding → boiling point and molar heat fusion is high Solutions-Soluble – capable of being dissolved a. Molecules become uniformly distributed-Solution – homogeneous mixture of two or more substances in a single phase b. Atoms, molecules, or ions are thoroughly mixed, resulting in a mixture that has the same composition and properties throughout...
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