http://www.mindbites.com/lesson/1301 for full video. http://www.mindbites.com/series/118 for a bundle of videos on Chemical Nomenclature. For an even broader bundle of videos that cover Chemical Nomenclature and Atoms, Molecules, and Ions, check out http://www.mindbites.com/series/448 . To search for topic-specific help in our library of 400+ video products for Chemistry, please refer to our Chemistry category at: http://www.mindbites.com/category/24-chemistry . To check out our full Chemistry video course, with 300+ videos included, refer to: http://www.mindbites.com/series/549-chemistry-full-course . In this lesson, you will learn the common nomenclature of chemistry. Professor Harman defines and contrasts atoms, molecules, ions, and ionic salts/covalent solids. Then Professor Harman covers written chemical formulas and visual representations of molecules. A molecular formula is a chemical formula that represents the actual number of atoms of each element within a molecule. An empirical formula is a chemical formula of a compound written with the smallest integer ratio of subscripts. Empirical formulas are always used to describe ionic compounds and covalent network solids. Various visual representations of molecules include the ball and stick three dimensional model that closely represents the structure of the molecule, a line drawing that approximates the structure in two dimensional terms, and a shorthand often used by organic chemists. Professor Harman warns that molecules are defined by their unique arrangements of atoms, and a formula can represent many different molecular compounds (known as isomers). Taught by Professor Harman, this lesson was selected from a broader, comprehensive course, Chemistry. Dean Harman is a professor of chemistry at the University of Virginia, where he has been honored with several teaching awards. He heads Harman Research Group, which specializes in the novel organic transformations made possible by electron-rich metal centers such as Os(II), RE(I), AND W(0). He holds a Ph.D. from Stanford University.
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