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The Penny Experiment Revisited: An Illustration of Significant Figures, Accuracy, Precision, and Data AnalysisJoseph Bularzik In this general chemistry laboratory the densities of pennies are measured by weighing them and using two different methods to measure their volumes. The average and standard deviation calculated for the resulting densities demonstrate that one measurement method is more accurate while the other is more precise. Bularzik, Joseph. J. Chem. Educ.2007, 84, 1456.
Chemometrics |
Nomenclature / Units / Symbols |
Nonmajor Courses |
Physical Properties
Improving Conceptions in Analytical Chemistry: ci Vi = cf VfMargarita Rodríguez-López and Arnaldo Carrasquillo Jr. A common misconception related to analytical chemistry, which may be generalized as the failure to recognize and to account analytically for changes in substance density, is discussed. A cautionary example is made through the use of mass-based units of composition during volumetric dilution. The correct application of the volumetric dilution equation ci Vi = cf Vf is discussed. A quantitative description of the systematic error introduced by incorrect use of the volumetric dilution equation is also specified. Rodríguez-López, Margarita; Carrasquillo, Arnaldo, Jr. J. Chem. Educ.2005, 82, 1327.
Matching: How Many Elements Do You Know? This puzzle, part of a collection from the ACS 'Science for Kids' Web site, has students match various statements about the chemical elements, with answers from a list of possible correct responses.
Nomenclature / Units / Symbols
National Institute of Standards and Technology, (NIST) For one hundred years, scientists and engineers at the National Institute of Standards and Technology, formerly the National Bureau of Standards, have made broad-based and comprehensive contributions to chemical science and technology a of the United States.
