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Unformatted text preview: Sufficiently different electronegativity may allow actual dissociation of a bond H 2 O H + + OH- H + ions are a measure of acidity pH = -log [H + ] In a neutral solution, H + = 10 -7 M, pH = 7 Values for pH decline as [H + ] increases While the pH scale is based on H + , values for OH- can be easily calculated from the product relationship pH of blood = 7.4. If it drops below this, you have a general malaise. Not good at all. Kidney regulates blood pH, puts more or less protons in urine Changes in the position of electrons in covalent bonds constitute changes in energy status Electrons in covalent bonds between atoms of equal electronegativity have a greater potential energy than those between atoms with unequal electronegativity The closer the electronegativity = harder to put them together, so requires more energy, also releases more energy Covalent C-H bonds have more greater potential energy than O-H or C-O because the electrons are equidistant between C and H basis of all energy in biological systems lipids = full of energy! Lots of C-H bonds, 9 kcal per gram carbohydrates = 4 kcal per gram, short-term source of energy, then store it as fat Hybrid orbitals Tetrahedrons Ex. Methane H 2 O Carbon Skeletons...
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This note was uploaded on 03/14/2012 for the course BISC 13141 taught by Professor Williammcclure during the Spring '10 term at USC.
- Spring '10