Chemistry: Describing Chemical Formulas

http://www.mindbites.com/lesson/1301 for full video.

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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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[MrDrakonaire]

real helpful ppl^^

[Jarrodmontelius]

omg fucking baby talk, this really helped alot!! not

[shaakirei]

@lindaandjeffsam he's not idiot. take back your words.

[shaakirei]

i hate chemistry but this vid makes me wanna play with it.

[happinesson]

chemistry has never been this easy! i am starting to like it!

[lindaandjeffsampson]

what an idiot

[lindaandjeffsampson]

@UshouldKnowSon

thats funny

[UshouldKnowSon]

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[tayyabhassanzahidkmk]

very good mathod

[130Y]

Okay, one comment, you may not always want to simplify the ratio as it creates a new molecule (which is said in the video), but you may want to note that it is being said in accordance to the Empirical formula. You could also make mention of its structure, for example: 3D or 2D, network and so on.

Other than that, a good video.