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Criss-Cross Rule. “Perhaps one of you gentlemen would mind telling me just what is outside the window that you find so attractive..?” Image courtesy NearingZero.net.

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Presentation on theme: "Criss-Cross Rule. “Perhaps one of you gentlemen would mind telling me just what is outside the window that you find so attractive..?” Image courtesy NearingZero.net."— Presentation transcript:

1 Criss-Cross Rule

2 “Perhaps one of you gentlemen would mind telling me just what is outside the window that you find so attractive..?” Image courtesy NearingZero.net

3 Example: Aluminum Chloride Step 1: Step 2: Step 3: 13 Step 4: AlCl 3 Criss-Cross Rule Al Cl write out name with space write symbols & charge of elements criss-cross charges as subsrcipts combine as formula unit (“1” is never shown) Aluminum Chloride

4 Example: Aluminum Chloride Step 1: AluminumChloride Step 2: Al 3+ Cl 1- Step 3: Al Cl 13 Step 4: AlCl 3 Criss-Cross Rule

5 Example: Aluminum Oxide Step 1: Aluminum Oxide Step 2: Al 3+ O 2- Step 3: Al O 23 Step 4: Al 2 O 3 Criss-Cross Rule

6 Example: Magnesium Oxide Step 1: Magnesium Oxide Step 2: Mg 2+ O 2- Step 3: Mg O 22 Step 4: Mg 2 O 2 Step 5: MgO Criss-Cross Rule

7 Naming Binary Compounds FormulaName 1 BaO____________________ 2________________ sodium bromide 3 MgI 2 ____________________ 4 KCl____________________ 5________________ strontium fluoride 6________________ cesium fluoride barium oxide NaBr magnesium iodide potassium chloride SrF 2 CsF

8 Rules for Parentheses Parentheses are used only when the following two condition are met: 1.There is a radical (polyatomic ion) present and… 2.There are two or more of that radical in the formula. Examples: NaNO 3 NO 3 1- is a radical, but there is only one of it. Co(NO 3 ) 2 NO 3 1- is a radical and there are two of them (NH 4 ) 2 SO 4 NH 4 1+ is a radical and there are two of them; SO 4 2- is a radical but there is only one of it. Co(OH) 2 OH 1- is a radical and there are two of it. Al 2 (CO 3 ) 3 CO 3 2- is a radical and there are three of them. NaOHOH 1- is a radical but there is only one of it.

9 Ions in Chemical Formulas Keys Ions in Chemical Formulas Ions in Chemical Compounds - Grid

10 Hungry for Tater Tots? Mr. C at 7 years old.

11 Ions in Chemical Compounds - Grid Ions in Chemical Compounds Keys Ions in Chemical Compounds - Grid


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