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Without Water, life on Earth would not exist!!!

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WATER Without Water, life on Earth would not exist!!! � Structure Water is an inorganic molecule with the molecular formula H2O, containing hydrogen and oxygen atoms which are bonded covalently. In the structure oxygen gets a slightly greater share of the electrons so it is therefore lightly negative and the hydrogen atoms are slightly positive. This makes the molecule to be what is called dipolar. Water molecules are held together at the hydrogen atoms, however this bond is quite weak whereas the inter -molecular bond is quite strong. �Water as a solvent Numerous substances may be dissolved into water, dipolar molecules are attracted to the charges on the molecules of water, so they spread out evenly in the water. ...read more.


However not all substances dissolve into water, for example those substances with large molecules such as starch or the protein keratin. � Thermal Properties Water has a very high specific heat capacity, as it's molecules are attracted to each other, so it therefore takes a lot of energy to make them move about a lot, this is essential to aquatic organisms as it means that no matter what the temperature of a day, whether hot or cold, the temperature will not change very much from the temperature in which the organism is used to. For example a temperature of 100C must be reached to boil water, so as living organisms contain a very large amount of water, eg. ...read more.


�Surface Tension In water the attraction between molecules means that a molecule on top of an amount of water will be pulled down on top of the below others, creating a surface layer much like a skin. This is useful as it allows enough tension for small animals i.e. pond skaters to rest on the upper 'skin like' layer. * Water Density Water's high density caused by the hydrogen bonding between individual molecules which creates a close bond means that as most living organisms have a like density, they are able to float in water, which is why aquatic organisms are able to swim in water. ...read more.

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