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(2.2) IONIC COMPOUNDS- POLYATOMIC
NAMES & FORMULAS…MORE
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Polyatomic Ions A polyatomic ion:
is an ion that is made up of two or more atoms has a positive or negative charge
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Polyatomic Ions Example: nitrate ion NO31- This ion has a charge of -1
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Polyatomic Ions We use polyatomic compounds in our daily life!
ex. ammonium nitrate NH4NO (fertilizer) calcium carbonate CaCO (chalk)
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Some Common Polyatomic Ions
Name of ion Formula Charge ammonium NH41 +1 hydroxide OH1- -1 nitrate NO31- carbonate CO32- -2 sulfate SO42-
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Writing Formulas To write a formula for a polyatomic compound use the “criss-cross” method. Examples: a) sodium nitrate NaNO3 b) calcium hydroxide c) ammonium nitrate d) potassium carbonate NOTE: (use brackets where needed)
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Writing Formulas To write a formula for a polyatomic compound use the “criss-cross” method. Examples: a) sodium nitrate NaNO3 b) calcium hydroxide Ca(OH)2 c) ammonium nitrate NH4NO3 d) potassium carbonate K2CO3 NOTE: (use brackets where needed)
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Let’s review Some videos The Formation of Metal Ions
Writing a Chemical Formula based on a Name: Aluminum Oxide
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PRACTICE Worksheet 2.2 (B) compound naming Did You Complete? Workbook
Quiz tomorrow Ionic Compounds
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