Topic: Naming Ionic Compounds Do Now: Write formulas for the following 1. Na and Cl 2. Mg and I 3....
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Transcript of Topic: Naming Ionic Compounds Do Now: Write formulas for the following 1. Na and Cl 2. Mg and I 3....
Topic: Naming Ionic Compounds
Do Now: Write formulas for the following
1. Na and Cl
2. Mg and I
3. Al and S
Na+1 Cl-1 = NaCl
Mg+2 I-1 = MgI2
Al+3 S-2 = Al2S3
Naming Binary Ionic Compoundsthere is a flow chart for you to use add to your reference table packet
1. Always name metal (the cation/+ ion) first
2. Leave a space
3. Write stem of nonmetal (the anion/ - ion)
and Add ending “ide” to nonmetal
Binary = only 2 types of elements
(two capital letters)
Stems of nonmetals
Iod
Brom
Chlor
Fluor
Hydr is the stem for H
Tellur
SelenArsen
SulfPhosph
OxNitr
Metals with one oxidation state
• CaO• BaS• AlN• LiCl• Al2Se3
• Na2O• K3N• MgF2
Calcium Oxide
Barium Sulfide
Aluminum Nitride
Lithium Chloride
Aluminum Selenide
Sodium OxidePotassium Nitride
Magnesium Fluoride
The First Step in Naming
• Find metal on PT
• If metal has only one oxidation state it’s easy
• If metal has more than one oxidation state, there’s an extra step
Metals with more than 1 oxidation state • Use formula to figure out which
oxidation state metal ion has
• Ex: Fe can be Fe+2 or Fe+3
»FeO vs Fe2O3
– two different compounds so cannot both be called iron oxide
– so we have to use Roman Numeral to Tell which Fe (Fe+2 or Fe+3) we are using
– Iron (II) Oxide –uses Fe+2 – Irons (III) Oxide – use Fe+3
When deterring Oxidation State of Metal being used, assigned
the nonmetal it’s oxidation number first (will be the top
oxidation number from the PT)
FeO• Compounds are electrically neutral
• Oxygen is -2
FeO
Name: Iron (II) oxide but means Iron (+2) Oxide
(roman numeral II = charge on Fe is +2)
1 O which is -2
so Fe must be +2
FeO and Fe2O3
Fe2O3
Each O is -2
There are 3 O’s3 X (-2) = -6Total negative charge
Total positive charge must be +6
Each Fe is +3
Name: Iron (III) oxide but means Iron (+3) Oxide
(roman numeral III = charge on Fe is +3)
Name the following
• TiCl3• MnO2
• Co2O3
• PdBr2
• AuCl3• MoN• MnO• TiO
Titanium (III) chloride
Manganese (IV) oxide
Cobalt (III) oxide
Palladium (II) bromide
Gold (III) chloride
Molybdenum (III) nitride
Manganese (II) oxide
Titanium (II) oxide
Summary for Binary Ionic Compounds
Compounds are electrically neutral
• Formula: positive first
• If metal has more than 1 oxidation state, name has roman numeral (MOST ALL TRANSITION METALS need this)
• Name = metal + stem of nonmetal + ide
Some ionic compounds have a polyatomic ion – see table E
EXAMPLEKOH - K = metal (positive ion) and OH = polyatomic ion (negative ion)
MgSO4 – Mg = metal (positive ion) and SO4 = polyatomic ion (negative ion)
Naming compounds with polyatomics
• polyatomic ions have names (Table E)
• naming is parallel to binary naming
• positive always written first
• if (+)’ve ion is a metal, check to see how many oxidation states it has – if > 1 then name must have roman numeral
• if (–)’ve is polyatomic - 2nd part of name is name of polyatomic (don’t modify ending)
Name the following
• NaOH• KHCO3
• LiNO3
• CaSO4
• Al(NO3)3
• Fe(OH)2
• CuSO4
• CuSCN
Sodium hydroxide
Potassium hydrogen carbonate
Lithium nitrate
Calcium sulfate
Aluminum nitrate
Iron (II) hydroxide
Copper (II) sulfate
Copper (I) thiocyanate