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Lecture 2

Biology Lecture 2 Review.docx

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Western University
Biology 1001A
Tom Haffie

September 15/2011 Biology Lecture 2- Review Hydrogen Bonds and the Properties of Water • HYDROGEN BONDS- Non-covalent bond formed by unequal electron sharing between hydrogen atoms and oxygen, nitrogen, or sulphur atoms • WATER LATTICE- the arrangement of water molecules due to hydrogen bonding o In Liquid water, each water molecules establishes an average of 3.4 hydrogen bonds with its neighbour. The hydrogen bonds constantly break and reform o In ice, the water lattice is a rigid, crystalline structure in which each water molecule forms 4 hydrogen bonds with neighbouring molecules.  The rigid ice lattice spaces the water molecules farther apart, causing ice to be about 10% less dense than liquid water • SPECIFIC HEAT CAPACITY- The amount of heat required to increase the temperature of a given quantity of water o Hydrogen Bonding causes water to absorb large amounts of heat before its temperature increases/boils  All energy goes in to breaking hydrogen bonds • COHESION
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