9-5-07 lesson 4 water and the environment

9-5-07 lesson 4 water and the environment - Water Water:...

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Water Water: structure Emergent properties of water Dissociation of water molecules
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Water molecules are polar Polar covalent bonds Has two different ends (having two different ends)
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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 Hydroge n 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 Form up to four hydrogen bond to its neighbors
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Cohesion Water transport in plants Water conducting cells
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Surface Tension Measure of how difficult it is to stretch or break the surface of a liquid Bonds to the surface and underneath it
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Water Moderates Temperature Absorbs heat from warmer air and releases heat to cooler air Absorbs/releases large amounts of heat with only a slight change in its own temperature Due to high specific heat Temperature is the measure of speed of the atoms in the molecules Decreases, speed of molecules decreases Increases, speed of molecules increases
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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/C High specific heat due to hydrogen bonding Heat must be absorbed to break hydrogen bonds
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9-5-07 lesson 4 water and the environment - Water Water:...

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