CHEM 1050 Lecture : nov. 26th notes
1 Dec 2012
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2h2o2 2 h2o + o2 ie; decomposition of h2o2 in h2o. Decomposition of h2o2 in h2o happens very slowly. But in the presence of iodide ion reaction is faster. Catalysts work by lowering activation energy (ea) and frequency (a) Ex; c2h4 (ethylene) + h2 ch3-ch3 (ethane) Ex of heterogeneous catalysts: catalytic converter in car: -use noble metals (pt) or transition metals for these conversions (cuo or. Ex: uranium-238 is very slow and sulfur-35 is very rapid. Radioactive decay is a first order process. And each isotope has it"s own t1/2 ex: strontium- 90: t1/2= 29 years. *one feature of half lives for nuclear decay is that they are unaffected by external conditions (unlike toxins). The t1/2 of cobalt -60 is 5. 3 years. Assume formation of carbon-14 by neutron capture in the upper atmosphere. Assume that ratio of c-14 to c-12 in atmosphere has been constant for at least 50, 000 years.
