Names and Formulas - Chemical Names and Formulas Review...

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C hemical N ames and F ormulas Review FAQ’s About Names and Formulas Q. How do I know if a polyatomic ion is in the formula? A. Whenever there are more than three different elements in formula, check your polyatomic ion sheet. Example Al(NO 3 ) 3 NO 3 is a polyatomic ion called nitrate Q. When do I use a roman numeral in writing the name of a formula? A. You would first find the element on the periodic table, if it is a transition or inner transition metal and it has more than one charge (ex. Fe) then you would write the charge using a roman numeral in parentheses. Ex. FeO 2 O 3 is Iron (III) Q . When do I use the “ide” ending or suffix? A. You would use the “ide” suffix only when naming a nonmetal in a compound. It doesn’t matter whether it is an ionic or molecular compound, the nonmetal loses it’s suffix and adds “ide” Ex. NaCl is sodium chloride NOT sodium chlorine Q. When naming a compound, which ion is named first? The cation or anion? A.
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This note was uploaded on 10/04/2010 for the course CHEM 145 taught by Professor Prezhdo during the Fall '08 term at University of Washington.

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Names and Formulas - Chemical Names and Formulas Review...

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