Lesson 22: Isn’t It Ionic? Polyatomic Ions.

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Presentation transcript:

Lesson 22: Isn’t It Ionic? Polyatomic Ions

ChemCatalyst The cards show a sodium ion and three polyatomic ions. What do you think a polyatomic ion is? Name three compounds formed between sodium ions and each of the three polyatomic ions. Use the rule of zero charge to write the compounds’ formulas.

Key Question What is a polyatomic ion?

Objectives: recognize and name polyatomic ions write names and chemical formulas of compounds with polyatomic ions

Prepare for the Activity Work in pairs. Ionic compound: An ionic compound is a compound composed of positive and negative ions, formed when metal and nonmetal atoms combine.

Lesson 22 Notes (cont.) a.)Polyatomic ion: An ion composed of a group of atoms with an overall positive or negative charge.

Notes (cont.) b.)Ionic compounds with polyatomic ions must also follow the “Rule of Zero” If more than one group is needed, use parenthesis (?)

Notes (cont.) c.)Polyatomic ions have their own unique naming guidelines. Do not change ending to -ide Polyatomic ion Name OH– hydroxide NO3– nitrate CO32– carbonate SO42– sulfate NH4+ ammonium

Check-in 22 What is the name of the compound Be(NO3)2? What is the correct formula of a compound made with sodium and carbonate?