Chemistry 101-page4

Chemistry 101-page4 - -Charles Goodyear heated it with...

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- Ethylene, the simplest monomer, can add to itself at high temperatures and pressures to form polymers with molar masses up to several million. - The high temperature and pressure causes one of the bonds in the double bond to disassociate to form free radicals which are reactive. - Initiators, unstable compounds that readily form radicals, are often used to get the addition reaction going. Polyethylene - Depending on the temperature and pressure and catalyst used, polyethylene of different molecular weights and degrees of branching and cross linking can occur. - Long linear chains can pack closely together to give a hard, tough and rigid plastic. It is called High Density Polyethylene of HDPE. Natural & Synthetic Rubber - The rubber tree contains isoprene which can polymerize like a substituted ethylene to form poly-cis-isoprene or crude rubber. - The rubber particles are mixed with water which appears as a milky white fluid or latex. - It is sticky and elastic.
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Unformatted text preview: -Charles Goodyear heated it with sulfur and produced vulcanized rubber which is elastic but not sticky. -Synthetic Rubber: Made from 1,3-butadiene rather than natural isoprene (2-methyl-1,3-butadiene). Chiari Disease -1 in 1200 people have it. -1 in 1000 need surgical treatment. -Brain stem and upper cervical decompression -Blockage of obex. -Drainage of syrinx. -This is what He Has! -Surgical Intervention o Midline skin incision is made from the occiput to the spinous process of C4. April 14, 2011 Sugars -A single sugar molecule is called a monosaccharide. -Two linked sugar molecules is called a disaccharide. -Three linked sugar molecules is called a trisaccharide. -Two monosaccharides can condense to yield a disaccharide and a molecule of water. -Three common disacchraides are Sucrose, Maltose and Lactose. Common Disaccharides -Sucrose o Common table sugar. o 80 million tons a year produced form sugar beets (40%) and sugar can (60%)....
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