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Convert Ice to Liquid Water by Applying Pressure

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Water is a substance with some very unusual properties. Based on a comparison of the water molecule and the structure of ice explain (a) why ice is less dense than water, and (b) why increasing pressure, within a certain temperature range, causes ice to melt. (c) why is it not possible to convert ice to liquid water by applying pressure at very low temperatures?

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When frozen, a molecule of water is hydrogen bonded to four other water molecules. The two hydrogen atoms that are part of the central water molecule are attracted to oxygen atoms of two other water molecules. Hydrogen from two other water molecules is attracted to the oxygen of the central water molecule. This open crystalline structure occupies a large amount of space.
When ice melts, ...

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