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7.2 ionic compunds

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by

Amber Dowdy

on 10 October 2012

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Transcript of 7.2 ionic compunds

Ionic Bonds & Compounds Page 194 Compounds composed
of anions & cations are
called IONIC CMPS. ionic comps are usually made of a metal and nonmetal anions ionic compounds are electrically neutral They are neutral bc the total charge of cations(+) = the charge of the anions (-) http://www.elmhurst.edu/~chm/vchembook/143Aioniccpds.html anions and cations have opposite charges & attract one another by electrostatic forces. these forces that hold ions together are called ionic bonds **READ Page 194, last paragrpah What happens when Na and Cl react to form a compound? chemist represent the composition of substances by writing chemical formulas.
*What do these formulas tell us? chemical formula: shoes the kinds and numbers of atoms in the samllest representative unit of a substance formula unit: lowest whole # ratio of ions in an ionic comp *Read pg 105 What is the formula unit for magnesium chloride? http://www.youtube.com/watch?v=y506Kr3Y2wQ most ionic comps are crystalline solids at room temp They are arranged in a repeating 3d pattern ionic comps have high melting points the coordination number of an ion is the number of ions of the opposite charge that surround the ion in a crystal ionic compounds can conduct an electric current when melted or dissolved in water; http://www.youtube.com/watch?v=Ys4IjCXIi7o
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