Lecture 4 questions

Lecture 4 questions - 1. Describe the bonding of the atoms...

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1. Describe the bonding of the atoms that make up a molecule of water. How does this structure produce attractions between water molecules? What properties of water stabilize temperature and lead to evaporative cooling? Polar Covalent bond: covalent bond between atoms that differ in electronegativity. The electrons are closer to the more electronegative atom, making it slightly negative and the other atom slightly positive. Hydrogen bond: A type of weak chemical bond formed when the slightly positive hydrogen atom of a polar covalent bond in one molecule is attracted to the slightly negative atom of a polar covalent bond in another molecule. The charged regions of polar water molecules are attracted to oppositely charged parts of close-by molecules Evaporative cooling is caused by water having such a high heat of vaporization. (580 cal/g) 2. Why does ice float and why is this important for aquatic organisms living in icy environments? Ice floats because the molecules of water are at their lowest density when frozen. The ice creates a barrier between the water and extremely cold air. 3. Why is water an excellent solvent for ionic and polar molecules? Because the negatively charged oxygen atom attracts positive atoms and the positively charged hydrogen
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This note was uploaded on 03/09/2010 for the course BIOL 1201 taught by Professor Wishtichusen during the Spring '07 term at LSU.

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Lecture 4 questions - 1. Describe the bonding of the atoms...

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