Your Bibliography: Darwent, B., 1970. Bond dissociation energies in simple molecules. [Washington, D.C.]: U.S. Dept. of Commerce, National Bureau of Standards.
Your Bibliography: Linstrom, P. and Mallard, W., 1997. NIST chemistry webbook. [Washington, D.C.]: National Institute of Standards and Technology.
Your Bibliography: Marzzacco, C., 1999. The Enthalpy of Decomposition of Hydrogen Peroxide: A General Chemistry Calorimetry Experiment. J. Chem. Educ., 76 (11), p.1517.
Your Bibliography: Marzzacco, C., 1999. The Enthalpy of Decomposition of Hydrogen Peroxide: A General Chemistry Calorimetry Experiment. J. Chem. Educ., 76 (11), p.1517.
Your Bibliography: Marzzacco, C., 2008. The effect of a change in the catalyst on the enthalpy of decomposition of hydrogen peroxide. Chem 13 News, Reprinted from pages 16-17, May 2001, pp.12-13.
The conference began with a procession of Scottish bagpipers, flags of the 14 countries represented at the conference, the new CHEMED Flag, and 109 periodic table banners of the elements carried by the Trumbull High School Marching Band, all followed by members of the National Mole Day Foundation in full mole costumes. Rhonda Reist of Olathe North High School served as a witty master of ceremonies. Babu George, the general chairman, welcomed the conferees. Awards were then presented to sponsors: gold awards to Educational Innovations for its sponsorship of the Saturday evening mixer and to Carolina Biological for the Tuesday evening safety lecture and reception; a platinum award to Flinn Scientific for its generous support over the years. Signature Demonstrations opened the program and were presented by some of our best: Geri Blomquist, Al Delfiner, John Fortman, George Hague, Bob Lewis, John Moore, Walter Rohr, Jerry Sarquis, and Penney Sconzo. The evening closed with a reception honoring Lew Brubacher for his many years of service as editor of Chem 13 News.
The back pages of issues in Volumes 1-9 contained Local Activities and Opportunities ( later called Contemporary News in Chemistry and Education), which posted summaries of goings-on in chemistry departments, ACS sections, and foreign scientific organizations. These news clips are valuable sources of anecdotal information from the 1920s and early 1930s.
An experiment is described in which polystyrene films containing various levels of plasticizers are prepared by solution-casting onto steel test panels. These films are subsequently tested for hardness using a pencil hardness technique, impact resistance using a drop weight test, and glass transition temperature using differential scanning calorimetry. All three plasticizers tested cause measurable changes in the physical properties of the plastic films, although the extent of the effects as a function of concentration varies dramatically among the plasticizers. Concepts of plasticization and interpretation of test results are discussed.
We first offered Chemical Information as a one-credit, semester-long course in 1993 and have continued to team-teach it each fall. We offer this summary of our course as a model that might be adapted in other settings, acknowledging that no single course can adequately prepare chemists for the many challenges involved in finding, evaluating, and utilizing chemical information. The focus on information retrieval, evaluation, and presentation in a separate course has worked well for us, successfully integrating concepts of information literacy in a chemical context. We cover a wide array of topics, beginning with print and electronic resources on our campus and moving quickly to databases and other sources on the Internet. Searching CA Online via STN Express and STN Easy is emphasized more than any other single source. We have described the course in some detail elsewhere and give here a synopsis of our current approach and significant changes in the course over the last two years.
Alkyl parabens (4-hydroxy alkyl benzoates), which are common ingredients in cosmetic formulations, are separated by capillary electrophoresis. The electrophoretic mobilities of the parabens can be explained on the basis of their relative size. 3-Hydroxy ethylbenzoate is also separated to demonstrate the effect of substituent position on the acid dissociation constant and the effect this has on electrophoretic mobility. Homologous series of alkyl benzoates and alkyl phthalates (common plasticizers) are separated by micellar electrokinetic chromatography at four surfactant concentrations. This exercise demonstrates the separation mechanism of micellar electrokinetic chromatography, the concept of chromatographic phase ratio, and the concepts of micelle formation. A photodiode array detector is used in both exercises to demonstrate the advantages and limitations of the detector and to demonstrate the effect of pH and substituent position on the spectra of the analytes.
The flammability of synthetic finger nails has been examined using a Bunsen burner and a birthday candle as ignition sources. The samples exhibited short ignition times (approximately 1 second) and burned to completion. Owing to the molten nature of the polymer while ignited and the ease with which ignition occurs, synthetic nails should be considered a fire hazard and students warned of their dangers.
Henry's law describes the relationship between the pressure of a gas and the concentration of that gas in solution. Presented here is the application of Henry's law to the noise associated with "cracking" knuckles. Gases dissolved in the synovial fluid in joints rapidly come out of solution as the joint is stretched and pressure is decreased. This "cavitation" produces a characteristic noise.
Safety culture is often divided into three domains, which include personal, environmental, and behavioral factors.
In response to the call from the Chancellor of the University of California Los Angeles for the campus to be the “Best in Class” in academic laboratory safety, (1) it will be essential not only to implement and meet all the top-down safety regulations required by regulatory agencies, as they can be considered the minimum requirements, (2) but it will also be important that every researcher in an academic setting takes ownership of measures that will help make their working environment safer.
Figure 1. Geller’s Safety Culture Model illustrated with the three domains including personal factors, environmental factors, and behavioral factors.
In a transition period, while a positive safety culture is being enhanced to the level of self-perpetuation, the main challenge in an academic laboratory setting is to persuade researchers to adopt good practices that may be perceived as not having sufficiently high value.
During weekly meetings, group members often discuss current topics in safety, and sometimes give “pop quizzes” regarding safety matters ( Appendix A ).
An important aspect for developing a good safety culture is to be proactive with measures that inform anyone who may be affected by one’s actions, including laboratory members, researchers in other groups, and emergency responders.
To evaluate the combined effectiveness of the practices mentioned above, we analyzed inspection data collected by EH&S in the Department of Chemistry and Biochemistry at UCLA during the period of 2011 to 2013.