Hydrogen Bonds & Properties of water 0.0 / 5 ? BiologyBiological moleculesASOCR Created by: Ellie678Created on: 01-10-15 16:09 Hydrogen Bonds Electromagnetic attraction between polar molecules in when hydrogen is bound to oxygen. Not a Covelent bond as they don't share electrons. It is an attraction between the positive and negative poles of charged atoms. It is a polar molecule because oxygen atoms are slightly negative and hydrogen atoms are slightly positive. 1 of 7 Cohesion Cohesion - Water molecules bind more which creates surface tension Resistance to force applied by insects - lets them walk on water. Movement of columns of water againest gravity in the xylem 2 of 7 Ice less dense than water Ice - Below 4°C, hydrogen bonds lengthen pushing water molecules apart. Ice layer insulates the body of water reducing the rate of heat loss. Stable envrioment for aquaticc organisms through the winter. 3 of 7 Good Solvent Good solvent - ions disociate because they are polar. Transport of molecules and ions around an organism/plasma membranes. Flow occurs due to hydrogen bonds constantly forming/breaking Non-polar molecules cannot dissolve 4 of 7 High Specific Heat Capacity High specific heat capacity - hydrogen bonds need a lot of energy to break them Thermal stability - aqautic organisms do not have a great fluctuation in the temperature Stable temperature needed for enzyme reactions Helps buffer temperature changes due to chemical reactions 5 of 7 Liquid at Room Temperature Liquid at room temperature - High BPt Provides habitats for living things Forms a major component of tissues in living things Provide a reaction medium for chemcial reactions Provide an effective transport medium 6 of 7 High Latent Heat of Vaporization High latent heat of vapourization - high amount of energy is needed to change state Effective cooling in plants and animals A lot of heat energy is taken away when a small number of water molecules evaporate. 7 of 7
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