Compounds & Molecules Counting atoms. Counting atoms in a chemical fomula Add up the subscripts. Ca 3 P 2 = 5 atoms Don’t forget the “invisible” 1’s CaCO.

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<ul><li> Slide 1 </li> <li> Compounds &amp; Molecules Counting atoms </li> <li> Slide 2 </li> <li> Counting atoms in a chemical fomula Add up the subscripts. Ca 3 P 2 = 5 atoms Dont forget the invisible 1s CaCO 3 = Ca 1 C 1 O 3 = 5 atoms Multiply anything inside parentheses by the subscript on the outside. Ba(NO 3 ) = 1 Ba, 2 N, 6 O = 9 atoms 22 </li> <li> Slide 3 </li> <li> Practice AlPO 4 MgC 2 O 4 Pb(MnO 4 ) 2 AgI Li 2 S B 2 (S 2 O 3 ) 3 6 7 11 2 3 17 How Many Atoms? </li> <li> Slide 4 </li> <li> Binary Compounds Writing Chemical Formulas </li> <li> Slide 5 </li> <li> The metal (or + ion) is always written first. The nonmetal (or ion) is always written last. The subscripts tell how many of each atom or polyatomic ion you have. </li> <li> Slide 6 </li> <li> Writing Chemical Formulas EXAMPLE: Write the chemical formula for the ionic compound containing Al and Br. #1 determine the charges Al +3 Br </li> <li> Slide 7 </li> <li> Writing Chemical Formulas #2 cross the charges. Do not carry the sign (+/-) and do not write the number 1. Al 3 Br 1 #3 simplify if needed (lowest common factor) Not needed here </li> <li> Slide 8 </li> <li> Writing Chemical Formulas You try: Mg and SMg 2 S 2 Simplify - MgS </li> <li> Slide 9 </li> <li> Writing Chemical Formulas USING POLYATOMIC IONS Na and OH -1 Na +1 OH -1 NaOH Ca and PO 4 -3 Ca +2 PO 4 -3 Ca 3 PO 4 2 ??? </li> <li> Slide 10 </li> <li> Writing Chemical Formulas **If the polyatomic ion gets a subscript you MUST use parentheses.** Ca 3 (PO 4 ) 2 </li> <li> Slide 11 </li> <li> Naming Ionic Compounds With Main Group Metals 1.Name the + Ion Name the metal. 2.Name the - Ion - Name the nonmetal, changing the ending to ide </li> <li> Slide 12 </li> <li> Naming Ionic Compounds Examples: MgO CaCl 2 magnesium oxide calcium chloride </li> <li> Slide 13 </li> <li> Naming Ionic Compounds With Polyatomic Ions 1.Name the + ion or polyatomic ion 2.Name the ion or polyatomic ion Examples: NaNO 3 Al 2 (SO 4 ) 3 sodium nitrate aluminum sulfate </li> </ul>

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