The kinetics of the reaction between nitric oxide and chlorine have been investigated in both carbon tetrachloride and glacial acetic acid. The nitric oxide-oxygen reaction has been investigated in carbon tetrachloride.The appearance of product, NOCl or NO,, was monitored spectrophotometrically a t a wavelength of 475 nm for NOCl and 343 nm for NO,. These measurements were performed using an Amino-Morrow stopped-flow apparatus equipped with a Beckman D U monochromator.The data for both the NO-Cl, and NO-02 systems could be fitted to the third-order integrated equation and the calculated rate constants were 2.75 x lo3 M 's-' and 2.79 x lofi M -' s ', respectively, at 25.1%.There was a noted increase in rate constants on changing the solvent from carbon tetrachloride to acetic acid.The likelihood of a termolecular encounter is inherent in the mechanism, however, no real evidence to substantiate either a direct termolecular or a series of two bimolecular steps has been obtained, although a -7 kcal for AHo would support the latter.
A new flowtube reactor employing dissociative electron attachment to produce radicals and high-pressure photoionization in the mass spectrometric detection of radicals is described. The system has been applied to a study of the association reactions of CHClz and CCl3 with 0 2 in a great excess of helium at total densities below 1017 cm-3 over the temperature range 286 to 332 K. Both reactions display a strong negative temperature coefficient. The results can be parameterized in the form ko(CHC12 + 0 2 ) = (4.3 ? 0.2) x 10-31(T/300)-6.7'0.7 cm6 s-', ko(CC1S + 0 2 ) = (2.7 ? 0.2) X 10-31(T/300)-8.7'1.0 cm6 5 -l .
In all college laboratory courses, students are introduced to safety principles as soon as they are assigned laboratory work involving chemicals. This continues throughout their lives as they work in laboratories and plants.At some point each person becomes responsible for his own laboratory safety and that of others. This means that he must be able to make judgments based on sound principles or on research into specific hazards. He must be sure enough of himself that he can advise others with confidence and authority.Safety topics which are useful to an undergraduate student are similar to those presented to industrial groups for plant L. Jewel Nicholls received her BS from Monmouth College and her PhD from the University of Illinois at Chicago. She is presently the Coordinator of the Undergraduate Laboratories and Storerooms at the University of Illinois at Chicago Circle where she developed the course she describes in this paper under the auspices of an NSF grant. Her research interests lie in the field of inorganic chemistry, particularly the stereochemistry of metal complexes containing chiral donor atoms, as well as in the development of materials for safety courses and safe laboratory experiments.
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