CHEMISTRY OF LIFE

CHEMISTRY OF LIFE - Explain isotopes, Small molecules eg....

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CHEMISTRY OF LIFE : Introduction: 150 years ago there were natural occurances which were mysteries. Disease, Fermetation, Putrefaction--- A pile of farm silage steaming in the cool autumn---what caused these things? All were mysteries either accepted or attributed to God. Then when an invisible world came into focus with Leewenhoek we began to understand. In this section we look at the nature of matter itself with an eye toward living matter to try to understand why chemicals behave as they do and how they interact to give us microbial life. Concepts: 1. Pure Substances or Mixtures. Elements and Compounds. Atoms and molecules and ions. Atomic mass, Atomic number, stable configurations of electrons. (Bohr Atom)
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Unformatted text preview: Explain isotopes, Small molecules eg. Water (show visual) serves as a solute for complex array of molecules in a living cell. Passes back and forth across membranes by osmosis. Molecules tend to stick together (Hydrogen Bonding). Amounts of Things: 1. What is the atomic weight of hydrogen, H 2 , HCl. 2. Define a mole 3. Concentration: A mole per liter! 4. Discuss pH--- 10-4 M H + = pH 4 IONIC AND COVALENT, POLAR COVALENT, HYDROGEN BONDS . 1. Ions and dissociation (one way things are acids) 2. Demonstrate a change in H+ concentration over time in a bacterial culture. 3. Effects of pH e.g. basic dyes won't stain at low pH. 4. Acids decrease pH by releasing H+ ions....
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