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BS111-Lecture 3 - Lecture Two Main Themes Electronic...

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Lecture Two Main Themes Electronic configurations gives rise to chemical properties: Covalent Bonds/Geometric Shapes Ionic Bonds Hydrophobic interactions van der Waals Inter/intra molecular Forces made up of chemical properties Hydrogen Bonding
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Water’s Properties
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I. Hydrogen bonding
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What other Properties of Water Make It So Important in Biology? Water has high specific heat —the amount of heat energy required to raise the temperature of 1 gram of water by 1°C. Water helps moderate climate because of its high heat capacity .
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Water has a high heat of vaporization —the amount of heat energy required to change water from a liquid to a gas state. The basis of evaporative cooling—heat must be absorbed from the environment in contact with the water.
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Cohesion : water molecules resist coming apart from one another. Helps water move through plants. Results in surface tension .
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A solution is a substance ( solute ) dissolved in a liquid ( solvent ).
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