(2.2) IONIC COMPOUNDS- POLYATOMIC

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Presentation transcript:

(2.2) IONIC COMPOUNDS- POLYATOMIC NAMES & FORMULAS…MORE

Polyatomic Ions A polyatomic ion: is an ion that is made up of two or more atoms has a positive or negative charge

Polyatomic Ions Example: nitrate ion NO31- This ion has a charge of -1

Polyatomic Ions We use polyatomic compounds in our daily life! ex. ammonium nitrate NH4NO3 (fertilizer) calcium carbonate CaCO3 (chalk)

Some Common Polyatomic Ions Name of ion Formula Charge ammonium NH41 +1 hydroxide OH1- -1 nitrate NO31- carbonate CO32- -2 sulfate SO42-

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)

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)

Let’s review Some videos The Formation of Metal Ions Writing a Chemical Formula based on a Name: Aluminum Oxide

PRACTICE Worksheet 2.2 (B) compound naming Did You Complete? Workbook Quiz tomorrow - Ionic Compounds