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C1 - Water (Water in Life (metabolic (Reactant/ substrate, in…
C1 - Water
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Cohesion & Adhesion
Cohesion
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AS water evaporates from the leaves at the top of the plant, water and dissolved minerals are drawn up the xylem vessels
Gives Surface tension, allowing some small organisms to "walk on water"
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Adhesion
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Adhesion attracts water molecules to the sides of the xylem vessels, helping support water as it moves up the vessel.
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the primary force that creates the capillary action movement of water upwards in plants is the adhesion between the water and the surface of the Xylem
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Thermal Properties
a Liquid at a range of temperatures due to the large amount of Energy needed to break the many weak hydrogen bonds
has a high specific heat capacity: it can absorb or loose a large amount of heat energy without a large change in temperature
has a high latent of vaporisation: when a water molecule evaporates it must break the hydrogen bonds with other water molecules which requires relatively large amount of energy.
Density of Water
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Water is most dense at 4oC so ice floats on water. the ice acts as an insulator reducing further cooling. this allows life to continue
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Support and Buoyancy
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this is due to buoyancy which is the balance of the downward force of gravity and the upward pressure exerted by the fluid below
