Week1Lecture(2)

Week1Lecture(2) - Molecules: • Molecular shape imp. to...

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Elements: (Lecture) Elements rarely exist in uncombined state Exceptions: o Gold, silver, platinum Uniform atoms Atom: Electron not quite particle, exhibit wave properties (x-ray) Nucleus (golf ball) o Protons (+), neutrons o Cloud (football field) o Electrons (-) Isotopes behave identically chemically but dif. Mass Electrons: o Exist in orbital’s (energy levels) which fall into shells o Outer shell filled by gaining/losing/sharing o Losing electron creates ions Metals lose electrons -> low electronegativity Elements w/ 3-5 electrons share
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Unformatted text preview: Molecules: • Molecular shape imp. to biological recognition Hydrogen Bonds: • Neither ionic or covalent • Relatively weak compared to covalent/ionic bonds Water: • H2O + H2O->H3O+OH- (ionization) • Breaking of covalent bond between O and H and creation of covalent bond of free H with other molecule (hydronium) • H3O referred to as H+ or proton • Very little ionization in pure water • Conc. of H3O+=OH-• Acids -> excess of H3O • Bases -> excess OH • Low pH (0-5) Neutral (5-9) High (9-14)...
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This note was uploaded on 09/28/2008 for the course BIOL 115 taught by Professor Brown during the Fall '08 term at McGill.

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Week1Lecture(2) - Molecules: • Molecular shape imp. to...

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