Oxygen is more electronegative so attracts electrons, has a - charge. Hydrogen has + charge
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What are hydrogen bonds?
The electromagnetic attraction between polar Molecules, hydrogen is bound to a larger atom. It is an attraction between the positive and negative poles of charged atoms
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What is the biological significance of water being a liquid at room temp?
Povides a fluid medium in which aquatic organisms can live, and acts a solvent for aqueous biochemical reactions inside cells
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Biological significance of water having high surface tension
So water forms droplets on surfaces, and rolls off. Allows some insects to walk on water.
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Biological significance of low viscosity
Water flows easily through small spaces or tubes.
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Biological significance of high latent heat of evaporation. Takes a lot of heat energy before water changes state
Lot of energy needed to break h bonds. Readily stays a fluid, so you cell cytoplasm unlikely to freeze. Evaporation has strong cooling effect in sweating ad transpiration.
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Biological significance of metabolite, it is used up or produced in biochemical rexactions
Water is used up in hydrolysis reactions to break apart molecules, and it is produced in condenstation reactions, to join molecules
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Cohesive and adhesive. Water molecules stick to each other and to other molecules
Cohesive bc its a polar molecule o forms many h bonds. Water molecules separate with difficulty,so water forms continuos columns in xylem and blood vessels
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Colourless, with a high transmittion value for visible wavelengths of light
Light penetrates aquatic environments, so allowing photosynthesis and vision
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Ice is less dense than water
Ice floats so leaving a layer of liquid water below it for aquatic animals. Ice also insulates the water from further freezing. Provides surface fr habitat, can walk on surface.
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High specific heat capacity. Water absorbsa lot of heat energy for a small increase in temp
As many h bonds need to be broken. Aquatic environments remain temp stable. Internal temp fluctuates less in response to external fluctuations
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Many substances can dissolve n water. It is classes as a universal solvent
As substances is solve easily in it, water is the main transport medium in organisms. Why salt dissolves in it
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Other cards in this set
Card 2
Front
What are hydrogen bonds?
Back
The electromagnetic attraction between polar Molecules, hydrogen is bound to a larger atom. It is an attraction between the positive and negative poles of charged atoms
Card 3
Front
What is the biological significance of water being a liquid at room temp?
Back
Card 4
Front
Biological significance of water having high surface tension
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