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Biology Lecture 4 - Water Chapter 3 Water molecules are...

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Water Chapter 3
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Water molecules are polar Polar covalent bonds… oxygen pulling e- away from both hydrogen atoms Hydrogen has positive charge Oxygen has negative charge
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Water molecules are polar The polarity of water molecules allows them to form hydrogen bonds with each other Responsible for the emergent properties of water Hydrogen bonds + + H H + + δ δ δ δ
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Emergent Properties of Water Cohesion Moderates temperature Expands upon freezing The Solvent of Life
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Cohesion Binding together of like molecules Due to hydrogen bonding Water molecules resist coming apart from each other
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Cohesion Water transport in plants Adhesion bonding together of different molecules Water conducting cells
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Surface Tension Measure of how difficult it is to stretch or break the surface of a liquid
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Water Moderates Temperature Absorbs heat from warmer air and releases heat to cool air Absorbs/releases large amounts of heat with only a slight change in its own temperature Measure avg speed of movement by temperature Due to high specific heat
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Specific Heat The amount of heat that must be absorbed or lost for 1g of a substance to change its temperature by 1 o C 1 calorie/g/ o C (relatively high specific heat) How well a substance resists changing it’s temperature High specific heat due to hydrogen bonding Heat must be absorbed to break hydrogen bonds Heat is released when hydrogen bonds form
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