Names and Formulas for Ionic Compounds Do Now: Article: 222, 226 Mastering Concepts: 236(54-56) Terms: 221 Practice Problems: 224(19-23) 225(24-28)226(29-33) Homework: Cornell Notes: 8.3 Section Assessment: 227(34-38) 9 Stamps

Section 8-3 Section 8.3 Names and Formulas for Ionic Compounds Relate a formula unit of an ionic compound to its composition. nonmetal: an element that is generally a gas or a dull, brittle solid and is a poor conductor of heat and electricity Write formulas for ionic compounds and oxyanions. Apply naming conventions to ionic compounds and oxyanions.

Section 8-3 Section 8.3 Names and Formulas for Ionic Compounds (cont.) formula unit monatomic ion oxidation number polyatomic ion oxyanion In written names and formulas for ionic compounds, the cation appears first, followed by the anion.

Section 8-3 Formulas for Ionic Compounds When writing names and formulas for ionic compounds, the cation appears first followed by the anion. Chemists around the world need to communicate with one another, so a standardized system of naming compounds was developed.

Section 8-3 Formulas for Ionic Compounds (cont.) A formula unit represents the simplest ratio of the ions involved.formula unit Monatomic ions are one-atom ions.Monatomic ions

Section 8-3 Formulas for Ionic Compounds (cont.) Oxidation number, or oxidation state, is the charge of a monatomic ion.Oxidation number

Section 8-3 Formulas for Ionic Compounds (cont.) The symbol for the cation is always written first, followed by the symbol of the anion. Subscripts represent the number of ions of each element in an ionic compound. The total charge must equal zero in an ionic compound.

Section 8-3 Formulas for Ionic Compounds (cont.) Polyatomic ions are ions made up of more than one atom.Polyatomic ions Never change subscripts of polyatomic ions, place in parentheses and write the appropriate subscript outside the parentheses.

Section 8-3 Formulas for Ionic Compounds (cont.)

Section 8-3 Names for Ions and Ionic Compounds An oxyanion is a polyatomic ion composed of an element (usually a non-metal), bonded to one or more oxygen atoms.oxyanion

Section 8-3 Names for Ions and Ionic Compounds (cont.)

Section 8-3 Names for Ions and Ionic Compounds (cont.) Chemical nomenclature is a systematic way of naming compounds. – Name the cation followed by the anion. – For monatomic, cations use the element name. – For monatomic anions, use the root element name and the suffix –ide.

– To distinguish between different oxidation states of the same element, the oxidation state is written in parentheses after the name of the cation. – When the compound contains a polyatomic ion, name the cation followed by the name of the polyatomic ion.

Section 8-3 Names for Ions and Ionic Compounds (cont.)

Practice Problems: 224 (19-23) Write the correct formula for the ionic compound composed of the following pairs of ions. 19. Potassium and iodide 20. Magnesium and chloride 21. Aluminum and bromide 22. Cesium and nitride 23. Barium and sulfide 15

Practice Problems: 224 (19-23) Write the correct formula for the ionic compound composed of the following pairs of ions. 19. Potassium and iodide 16 K+K+ K+K+ I-I- I-I- KI

Practice Problems: 224 (19-23) Write the correct formula for the ionic compound composed of the following pairs of ions. 20. Magnesium and chloride 17 Mg +2 Cl - MgCl 2

Practice Problems: 224 (19-23) Write the correct formula for the ionic compound composed of the following pairs of ions. 21. Aluminum and bromide 18 Al +3 Br - AlBr 3

Practice Problems: 224 (19-23) Write the correct formula for the ionic compound composed of the following pairs of ions. 22. Cesium and nitride 19 Cs +1 N -3 Cs 3 N

Practice Problems: 224 (19-23) Write the correct formula for the ionic compound composed of the following pairs of ions. 23. Barium and sulfide 20 Ba +2 S -2 Ba 2 S 2 Simplest formula BaS

Section 8-3 Formulas for Ionic Compounds (cont.) Copy p.224

Practice Problems: 225 (24-28) Determine the correct formula for the ionic compound composed of the following pairs of ions. 24. Sodium and nitrate 25. Calcium and chlorate 26. Aluminum and carbonate 27. Potassium and chromate 28.Magnesium and carbonate 22

Write the correct formula for the ionic compound composed of the following pairs of ions. 24. Sodium and nitrate 23 Na + NO 3 - NaNO 3 Practice Problems: 225 (24-28)

Write the correct formula for the ionic compound composed of the following pairs of ions. 25. Calcium and chlorate 24 Ca +2 ClO 3 - Ca(ClO 3 ) 2 Practice Problems: 225 (24-28)

Write the correct formula for the ionic compound composed of the following pairs of ions. 26. Aluminum and carbonate 25 Al +3 CO 3 -2 Al 2 (CO 3 ) 3 Practice Problems: 225 (24-28)

Write the correct formula for the ionic compound composed of the following pairs of ions. 27. Potassium and chromate 26 K+K+ K+K+ CrO 4 -2 K 2 CrO 4 Practice Problems: 225 (24-28)

Write the correct formula for the ionic compound composed of the following pairs of ions. 28.Magnesium and carbonate 27 Mg +2 CO 3 -2 Mg 2 (CO 3 ) 2 Practice Problems: 225 (24-28) Simplest formula MgCO 3

Metal Has fewer electrons Lose electrons  + Non Metal Has more electrons Gain electrons  - Formation of Ionic Bond Naming of Ionic Bond Cation Anion

Practice Problems: 226 (29-33) Name the following compounds. 29. NaBr 30. CaCl KOH 32. Cu(NO 3 ) Ag 2 CrO 4 29

Metal Non Metal Naming of Ionic Bond Cation Anion -ide 29. NaBr Sodium Brom Sodium Bromide ine -ide

Metal Non Metal Naming of Ionic Bond Cation Anion -ide 30. CaCl 2 Calcium Chlor Calcium Chloride ine -ide

Naming of Ionic Bond Cation Polyatomic ion 31. KOH Potassium Hydroxide Potassium Hydroxide

Naming of Ionic Bond Cation Polyatomic ion 32. Cu(NO 3 ) 2 Copper Nitrate Copper II Nitrate II Transition Metal requires roman numerals

Naming of Ionic Bond Cation Polyatomic ion 33. Ag 2 CrO 4 Silver Chromate Silver Chromate