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Today's Science for Tomorrow's ScientistsCaroline Pharr Today's Science for Tomorrow's Scientists (TSTS) is an interactive Web site containing modular instructional units that introduce current science research through online tutorials. Research groups can use images, movies, and other interactive functions to share their work with others, particularly students at the elementary, middle, and high school levels. Pharr, Caroline. J. Chem. Educ.2008, 85, 1453.
Applications of Chemistry
Impact of Polymers in Impact SportsSandy Van Natta and John P. Williams This article describes some aspects of the design and testing of helmets and two inquiry-based activities for evaluating different polymers used in helmet construction. Van Natta, Sandy; Williams, John P. J. Chem. Educ.2008, 85, 1326.
Applications of Chemistry |
Consumer Chemistry |
Physical Properties
Chemistry and Children's Literature: Sun Up, Sun DownPatricia B. McKean This article describes a simple hands-on activity that connects fascination with color changes with the use of sunscreen for skin protection. The first part of the activity uses newspaper to illustrate the strength of the sun while the second part employs ultraviolet (UV) detecting beads. McKean, Patricia B. J. Chem. Educ.2008, 85, 622.
Visit with Dr. Carroll In this article, future chemistry Meg A Mole interviews a scientist to explore their careers, including how they decided to become a scientist and provide information on what they actually do as part of their job. Suitable for grades 4-6.
Green Chemistry |
Applications of Chemistry
Annie's Recycling Matching Game This puzzle, part of a collection from the ACS 'Science for Kids' Web site, has students match various statements about recycling with answers from a list of possible correct responses.
Green Chemistry
Annie?s Sports Matching Game This puzzle, part of a collection from the ACS 'Science for Kids' Web site, has students match various statements about the chemistry of sport, with answers from a list of possible correct responses.
Molecular Models of Reactants and Products from an Asymmetric Synthesis of a Chiral Carboxylic AcidWilliam F. Coleman Our JCE Featured Molecules for this month come from the paper by Thomas E. Smith, David P. Richardson, George A. Truran, Katherine Belecki, and Megumi Onishi (1). The authors describe the use of a chiral auxiliary, 4-benzyl-2-oxazolidinone, in the synthesis of a chiral carboxylic acid. The majority of the molecules used in the experiment, together with several of the pharmaceuticals mentioned in the paper, have been added to our molecule collection. In many instances multiple enantiomeric and diastereomeric forms of the molecules have been included. This experiment could easily be extended to incorporate various aspects of computation for use in an advanced organic or integrated laboratory. Here are some possible exercises using the R and S forms of the 4-benzyl-2-oxazolidinone as the authors point out that both forms are available commercially. Calculation of the optimized structures and energies of the enantiomers at the HF/631-G(d) level using Gaussian03 (2) produces the results shown in Table 1. Evaluation of the vibrational frequencies results in no imaginary frequencies and the 66 real frequencies are identical for the two forms. Examination of the computed IR spectra also shows them to be identical. Additionally, the Raman and NMR spectra can be calculated for the enantiomers and compared to experimental values and spectral patterns. A tool that is becoming increasingly important for assigning absolute configuration is vibrational circular dichroism (VCD). Although the vibrational spectra of an enantiomeric pair are identical, the VCD spectra show opposite signs, as shown in Figure 1. One can imagine a synthesis, using an unknown enantiomer of the chiral auxiliary, followed by calculations of the electronic and vibrational properties of all of the intermediates and the product, and determination of absolute configuration of reactants and products by comparison of experimental and computed VCD spectra. Using a viewer capable of displaying two molecules that can be moved independently, students could more easily visualize the origin of the enantiomeric preference in the reaction between the chelated enolate and allyl iodide.
