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Warm up
• Convert the following:• 24.3 ml to kl• 23Mg to cg
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Water the Magic Molecule of Life
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The Polarity of Water Molecules• The Unequal sharing of Electrons in a covalent
molecule results in a polar molecule
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Cohesion• This is the attraction of molecules of water to each
other due to hydrogen bonding– In plants it helps them pull the water molecules up
against gravity
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Adhesion and Surface Tension
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Water Has a High Specific Heat
• Specific heat- The amount of heat it takes to change the temperature of 1 g of a substance 1°C– Calorie- the amount of heat necessary to raise 1g
of water 1°C– Hydrogen bonding dampens the effect of heating
thus causing the high specific heat
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Evaporative Cooling
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Ice vs Water
Ice is less dense thus it is floating an insulating the water below
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Solvent of Life• Aqueous solutions have water as the solvent– Hydration shell is the hydrogen side surrounding anions
and oxygen side surrounding cations in solution– Non-ionic compounds can also dissolve if they have
polar regions or ionic bonds on their surface
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Acidic and Basic Solutions