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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 8-3Section 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 8-3Section 8.3 Names and Formulas for Ionic Compounds (cont.)
formula unitmonatomic ionoxidation numberpolyatomic ionoxyanion
In written names and formulas for ionic compounds, the cation appears first, followed by the anion.
Section 8-3Formulas 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 8-3Formulas for Ionic Compounds (cont.)
• A formula unit represents the simplest ratio of the ions involved.
• Monatomic ions are one-atom ions.
Section 8-3Formulas for Ionic Compounds (cont.)
• Oxidation number, or oxidation state, is the charge of a monatomic ion.
Section 8-3Formulas 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 8-3Formulas for Ionic Compounds (cont.)
• Polyatomic ions are ions made up of more than one atom.
• Never change subscripts of polyatomic ions, place in parentheses and write the appropriate subscript outside the parentheses.
Section 8-3Formulas for Ionic Compounds (cont.)
Section 8-3Names 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.
Section 8-3Names for Ions and Ionic Compounds (cont.)
Section 8-3Names 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 8-3Names 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 iodide20. Magnesium and chloride21. Aluminum and bromide22. Cesium and nitride23. 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+ 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-
MgCl2
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-
AlBr3
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
Cs3N
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
Ba2S2 Simplest formula
BaS
Section 8-3Formulas 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 nitrate25. Calcium and chlorate26. Aluminum and carbonate27. Potassium and chromate28.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+ NO3-
NaNO3
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 ClO3-
Ca(ClO3)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 CO3-2
Al2(CO3)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+ CrO4-2
K2CrO4
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 CO3-2
Mg2(CO3)2
Practice Problems: 225 (24-28)
Simplest formula
MgCO3
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. NaBr30. CaCl2
31. KOH32. Cu(NO3)2
33. Ag2CrO4
29
Metal Non MetalNaming of Ionic Bond
Cation Anion -ide
29. NaBrSodium Brom
Sodium Bromideine-ide
Metal Non MetalNaming of Ionic Bond
Cation Anion -ide
30. CaCl2
Calcium ChlorCalcium Chloride
ine-ide
Naming of Ionic Bond
Cation Polyatomic ion
31. KOHPotassium Hydroxide
Potassium Hydroxide
Naming of Ionic Bond
Cation Polyatomic ion
32. Cu(NO3)2
Copper NitrateCopper II Nitrate
II
Transition Metal requires roman numerals
Naming of Ionic Bond
Cation Polyatomic ion
33. Ag2CrO4
Silver ChromateSilver Chromate