Forming New Substances

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Presentation transcript:

Forming New Substances Chapter 9 - 2 Part 2

Writing Formulas - Ionic Compounds The formula must have subscripts that cause the charges of the ions to cancel out making the compound neutral. An oxidation number is a positive or negative number.

Crisscross Method 1. Write the chemical symbols for each element in the compound (positive 1st) Ex: compound of calcium & chlorine Ca Cl 2. Write the oxidation numbers above the symbols. Ca2+ Cl- 3. Crisscross the oxidation numbers making them subscripts. Ca2+ Cl1- 4. Fill in the formula. CaCl2

Continued If they have the opposite charges or can be reduced, then they cancel each other out. For example: Li 1+ F1- = LiF Al 3+ P 3- = Al3P3 or AlP Ca2+ C4+ = Ca4C2 or Ca2C Pb4+ S2- = Pb2S4 or PbS2

Let’s Practice 1. Be N 2. Sr Te 3. Ba Pb 4. K O 5. Mg S 6. Na Cl Answers: Be3N2 K2O Sr2Te2 or SrTe Mg2S2 or MgS Ba4Pb2 or Ba2Pb NaCl

NAMING THE FORMULAS Ionic compounds do not use prefixes like covalent compounds do. The second name ends in “ide” just like covalent do. Examples: Be3N2 Beryllium Nitride or CaF2 is Calcium Fluoride

WRITING FORMULAS AND NAMING IONIC COMPOUNDS WS LET’S TRY IT! WRITING FORMULAS AND NAMING IONIC COMPOUNDS WS