Wednesday, January 14th, 2014 HW: Week 18 Agenda Problems #1,5,6 Objective: We will write formulae and apply naming conventions to ionic compounds with polyatomic ions Catalyst: A. Reaction temperature B. Addition of NaCl C. Addition of Fe D. Surface area of Mg Classroom expectations: Wear Kenwood ID. Cell phones, music players, and headphones are put away. Food is disposed of or put away. Dressed appropriately. Notebook is out and you are ready for today’s class. ***Table of Contents 1/14 Notes: Ionic Compounds w/Polyatomic Ions 102

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Catalyst/Announcements Homework Check Agenda Catalyst/Announcements Homework Check Finish Notes from Yesterday (1st period) Notes: Ionic Compounds with Polyatomic Ions

Agenda Problems

Ionic Compounds with Transition Metals 101

Writing Chemical Formulae for ionic compounds with type II metals 1.) Write the cation and anion with their charges. For example: Iron (III) chloride Fe3+ Cl1-

Writing Chemical Formulae for ionic compounds with type II metals 2.) Add cations and anions until the charges equal zero. For example: Iron (III) chloride Fe3+ Cl1- Cl1-

Writing Chemical Formulae for ionic compounds with type II metals 3.) Total the number of cations and anions to determine the subscripts in the formula. For example: Iron (III) chloride Fe3+ Cl1- Cl1- Iron (III) chloride = FeCl3

Whiteboard Practice Write the chemical formula of iron (II) chloride. FeCl2

Whiteboard Practice Write the chemical formula of chromium (III) oxide. Cr2O3

Whiteboard Practice Write the chemical formula of tin (II) oxide. SnO

Whiteboard Practice Write the chemical formula of tin (IV) oxide. SnO2

Whiteboard Practice What information is told by the roman numeral in the name of an ionic compound? The charge on an atom that has the potential to form multiple ions.

Notes: Ionic Compounds w/Polyatomic Ions Pg.

Polyatomic Ions A polyatomic ion is a group of atoms. has an overall ionic charge. Some examples of polyatomic ions are NH4+ ammonium OH− hydroxide NO3− nitrate NO2− nitrite CO32− carbonate PO43− phosphate HCO3− hydrogen carbonate (bicarbonate)

Some Compounds with Polyatomic Ions Copyright © 2009 by Pearson Education, Inc.

Polyatomic Ions to Memorize Name Formula Hydronium H3O+ Sulfite SO32- Ammonium NH4+ Nitrate NO3- Hydroxide OH- Nitrite NO2- Phosphate PO43- Chlorate ClO3- Peroxide O22- Chlorite ClO2- Carbonate CO32- Acetate C2H3O2- or CH3COO- Sulfate SO42- Must memorize ions by Wednesday’s quiz!!!!

Some Names of Polyatomic Ions The names of common polyatomic anions end in ate. NO3− nitrate PO43− phosphate with one oxygen less end in ite. NO2− nitrite PO33− phosphite

O S O Polyatomic Ions Why do polyatomic ions have an overall charge? O The polyatomic ion is drawn with brackets to show the ion is ONE unit O O S O 2- The charge of the polyatomic unit is written outside the bracket The charge is due to the ion having extra electrons Sulfate has 2 extra electrons resulting in a charge of -2

Naming Compounds with Polyatomic Ions The positive ion is named first, followed by the name of the polyatomic ion. NaNO3 sodium nitrate K2SO4 potassium sulfate Fe(HCO3)3 iron(III) bicarbonate or iron(III) hydrogen carbonate (NH4)3PO3 ammonium phosphite

Guide for Naming Polyatomic Ions Identify the cation and anion in the compound Name the cation, using a ROMAN NUMERAL, if needed. Name the polyatomic ion WITHOUT making any changes to the name. Write the name of the compound, cation first, anion last.

Example Problems Name the following compounds: Na2SO4 Mg(OH)2 NH4Cl Sodium Sulfate Mg(OH)2 Magnesium Hydroxide NH4Cl Ammonium Chloride Fe2(SO3)3 Iron (III) Sulfite

Whiteboard Practice Only write the problem given on your board. You will lose privileges and points for not following instructions.

Whiteboard Practice Match each formula with the correct name. A. MgS 1) magnesium sulfite MgSO3 2) magnesium sulfate MgSO4 3) magnesium sulfide B. Ca(ClO3)2 1) calcium chlorate CaCl2 2) calcium chlorite Ca(ClO2)2 3) calcium chloride Cu(NO2)2 1) Copper (II) Oxide CuO 2) Copper (II) Nitrite Fe2(SO4)3 3) Iron (III) Sulfate

Solution Match each formula with the correct name. A. MgS 3) magnesium sulfide MgSO3 1) magnesium sulfite MgSO4 2) magnesium sulfate B. Ca(ClO3)2 1) calcium chlorate CaCl2 3) calcium chloride Ca(ClO2)2 2) calcium chlorite Cu(NO2)2 2) Copper (II) Nitrite CuO 1) Copper (II) Oxide Fe2(SO4)3 3) Iron (III) Sulfate

Whiteboard Practice Name each of the following compounds: A. Mg(NO3)2 B. Cu(ClO3)2 C. PbO2 D. Fe2(SO4)3 E. Ba3(PO4)2

Solution Name each of the following compounds: A. Mg(NO3)2 magnesium nitrate B. Cu(ClO3)2 copper(II) chlorate C. PbO2 lead(IV) oxide D. Fe2(SO4)3 iron(III) sulfate E. Ba3(PO3)2 barium phosphite

Writing Formulas with Polyatomic Ions The formula of an ionic compound containing a polyatomic ion must have a charge balance that equals zero (0). Na+ and NO3− -> NaNO3 (net charge of zero) with two or more polyatomic ions, the polyatomic ion MUST be in parentheses. Mg2+ and NO3− -> Mg(NO3)2 NO3- Net charge of zero!!

Whiteboard Practice Select the correct formula for each. A. aluminum nitrate 1) AlNO3 2) Al(NO)3 3) Al(NO3)3 B. copper(II) nitrate 1) CuNO3 2) Cu(NO3)2 3) Cu2(NO3) C. iron(III) hydroxide 1) FeOH 2) Fe3OH 3) Fe(OH)3 D. tin(IV) hydroxide 1) Sn(OH)4 2) Sn(OH)2 3) Sn4(OH)

Solution Select the correct formula for each. A. aluminum nitrate 3) Al(NO3)3 B. copper(II) nitrate 2) Cu(NO3)2 C. iron(III) hydroxide 3) Fe(OH)3 D. tin(IV) hydroxide 1) Sn(OH)4

Whiteboard Practice Write the correct formula for each. A. magnesium nitrate B. calcium carbonate C. sodium phosphate D. iron(III) oxide E. iron(II) nitrite

Solution Write the correct formula for each. A. magnesium nitrate Mg(NO3)2 B. calcium carbonate CaCO3 C. sodium phosphate Na3PO4 D. iron(III) oxide Fe2O3 E. iron(II) nitrite Fe(NO2)2

Whiteboard Practice Name the following compounds: A. Ca3(PO4)2 B. FeBr3 C. Al2S3 D. Zn(NO2)2 E. NH4OH

Solution Name the following compounds: A. Ca3(PO4)2 Ca2+ PO43− calcium phosphate B. FeBr3 Fe3+ Br − iron(III) bromide C. Al2S3 Al3+ S2− aluminum sulfide D. Zn(NO2)2 Zn2+ NO2− zinc nitrite E. NH4OH NH4+ OH- ammonium hydroxide

Whiteboard Practice Write the formulas for the following: A. calcium nitrate B. iron(II) hydroxide C. aluminum carbonate D. copper(II) bromide E. lithium phosphate

Solution Write the formulas for the following: A. calcium nitrate Ca2+, NO3− Ca(NO3)2 B. iron(II) hydroxide Fe2+, OH− Fe(OH)2 C. aluminum carbonate Al3+, CO32− Al2(CO3)3 D. copper(II) bromide Cu2+, Br− CuBr2 E. lithium phosphate Li+, PO43− Li3PO4