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The Four Emergent Properties of Water
Transcript of The Four Emergent Properties of Water
Cohesion of Water Molecules
Water molecules are linked together by multiple hydrogen bonds, which makes water more structured than most liquids. Cohesion, due to hydrogen bonding, contributes to the transport of water and dissolved nutrients against gravity in plants. Water has an unusually high surface tension because the interface between water and air is an ordered arrangememt of hydrogen bonds and the surface of the water.
Moderation of Temperature by Water
Water's High Specific Heat
Specific Heat is the amount of heat that must be absorbed or lost for 1g of that substance to change 1°. Waters ability of stabilize temperature is because of its high specific heat. This can be related back to hydrogen bonding. When heat is absorbed the hydrogen bonds break, but heat is released when hydrogen bonds form. When the temp. of water drops slightly, many hydrogen bonds form and a considerable amount of energy is released in the form of heat.
The Heat of Vaporization is the quantity of heat a liquid must absorb for 1g of it to be converted from a liquid to a gas. Water has a high heat of vaporization because of the strength of its hydrogen bonds, which must be broken before the molecules can escape and become a gas. As the liquid evaporates, whats left behind cools down because the hottest molecules escape first. Waters evaporative cooling contributes to the stability of temperature in lake and ponds.
Floating of Ice on Liquid Water
Water is one of the only substances that is less dense in solid form than liquid. This ability is important to life because if ice sank then eventually all of our lakes and oceans would freeze up and life would be near to impossible. the glaciers we have today that float on top of the water helps insulate the water underneath and provides habits for animals. Global warming is affecting them in ways that eventually make them dissappear.
Water: Solvent of Life
Am aqueous solution is one where the solute is dissolved in water. Its a very versitile solite, which is traced back to its polarity. When somethings dissolved in water it has a hydration shell, which is when the water molecules is around each full ion.
Hydrophilic and Hydrophobic Substances