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Writing Ionic Compound Criss Cross Method. Example: Barium nitrate. 1. Write the formulas for the cation and anion, including CHARGES !. ( ). Ba 2+. NO 3 -. 2. 2. Check to see if charges are balanced. Now balanced. Not balanced!. = Ba(NO 3 ) 2.

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## Writing Ionic Compound Criss Cross Method

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**Writing Ionic CompoundCriss Cross Method**Example: Barium nitrate 1. Write the formulas for the cation and anion, including CHARGES! ( ) Ba2+ NO3- 2 2. Check to see if charges are balanced. Now balanced. Not balanced! = Ba(NO3)2 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Use the criss-cross method to balance subscripts.**Interactive writing**http://www.chemicalformula.org/chemistry-help/chemical-formula-writing-worksheet**Writing Ionic Compound Formulas**Example: Ammonium sulfate ( ) 1. Write the formulas for the cation and anion, including CHARGES! NH4+ SO42- 2 Now balanced. 2. Check to see if charges are balanced. Not balanced! = (NH4)2SO4 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Use the criss-cross method to balance the subscripts.**Writing Ionic Compound Formulas**Example: Aluminum sulfide 1. Write the formulas for the cation and anion, including CHARGES! Al3+ S2- 2 3 2. Check to see if charges are balanced. Now balanced. Not balanced! 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Use the criss-cross method to balance the subscripts. = Al2S3**Writing Ionic Compound Formulas**Example: Zinc hydroxide 1. Write the formulas for the cation and anion, including CHARGES! ( ) Zn2+ OH- 2 Now balanced. 2. Check to see if charges are balanced. Not balanced! 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Use the criss-cross method to balance the subscripts. = Zn(OH)2**Writing Ionic Compound Formulas**Example: Magnesium carbonate 1. Write the formulas for the cation and anion, including CHARGES! Mg2+ CO32- 2. Check to see if charges are balanced. They are balanced! = MgCO3

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