writing names and formulas for binary ionic compounds · writing names and formulas for binary...
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![Page 1: Writing Names and Formulas for Binary Ionic Compounds · Writing Names and Formulas for Binary Ionic Compounds. Chemical Formulas Chemical Formulas tell us what and how many elements](https://reader034.vdocuments.mx/reader034/viewer/2022042809/5f9557e0abf1fe5dee0c0a38/html5/thumbnails/1.jpg)
Writing Names and Formulas
for Binary Ionic Compounds
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Chemical FormulasChemical Formulas tell us what and
how many elements are in a compound
NaCl
1 Na atom
1 Cl atom
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SubscriptsSubscripts, written after the
element, identify the number of
atoms there are of each element.
H2O
2 H atoms
1 O atom
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ParenthesisMultiply each atom in parenthesis by
the subscript outside of the parenthesis
(NH4)3PO4
3 Nitrogen atoms
12 Hydrogen atoms
1 Phosphorus atom
4 Oxygen atoms
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Familiar Compounds
Sand
SiO2
Cane Sugar
C12H22O11
Lime
CaO
3 atoms 45 atoms 2 atoms
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Writing Formulas
Binary ionic compounds have only two
types of ions
Even though the ions carry a
charge, the compounds are neutral
The number of negative ions must
equal the number of positive ions
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Formula Writing Rules
1. Write the symbol and positive
oxidation numbered element
first
Magnesium Nitride
Mg +2
Representative Elements
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Formula Writing Rules
2. Write the symbol of the element
that has the negative oxidation
number or charge
Magnesium Nitride
Mg + 2 N -3
Representative Elements
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Formula Writing Rules
3. Write oxidation numbers of each
element, minus the charge, as the
subscript for the other element.
(Criss Cross)
Magnesium Nitride
Mg + 2 N -3
Mg3N2
Representative Elements
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Writing Names
1. Write the full name of the positive ion
NaCl
Sodium
2. Write the root name of the negative ion
NaCl
Sodium Chlor
Representative Elements
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Writing Names
3. Add the ending ide to the root
NaCl
Sodium Chloride
Practice
BaF2 KBr Al2O3
Representative Elements
Barium Fluoride
Potassium Bromide
Aluminum Oxide
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Transition Metals
Recall that transition metals can have
more than one charge.
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Transition Metals
Use roman numerals to denote the
charge
Fe+2 or Fe+3
Iron (ll) Chloride Iron (lll) Chloride
FeCl2 FeCl3
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Transition Metals
Writing Names
1. Write the full name of the transition
metals
PbO2
Lead
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Transition Metals
Writing Names
2. Figure out the charges of the anions
PbO2 2 x O-2 = - 4
Write the equivalent number of the
anion charges as a roman numeral
after the transition metal’s name
3.
Lead (IV)
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Transition Metals
Writing Names
PbO2
Add the ending ‘ide’ to the anion 3.
Lead (IV) Oxide
Practice
CuBr CuBr2
Copper (I) Bromide Copper (II) Bromide
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Transition Metals
Writing Formulas
1. Figure out the charge on the anion
Chromium (II) Sulfide
Sulfide S-2
2. Compare the anion’s charge to the
roman numeral on the transition metal
Cr (II) = +2 Sulfide S-2
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Transition Metals
Writing Formulas
Adjust the subscripts so that
charges on the transition metal are
equal to the anion’s total charge
3.
CrS
Sulfide S-2Chromium (II) Cr+2
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Transition Metals
Writing Formulas
More Practice
Sulfide S-2
Chromium (III) Sulfide
1. Figure out the charge on the anion
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Transition Metals
Writing Formulas
2. Compare the anion’s charge to the
roman numeral on the transition metal
Chromium (III) +3
S - 2 Cr +3
Cr +3 S - 2
S - 2
Sulfide S-2
+6-6
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Transition Metals
Writing Formulas
Adjust the subscripts so that
charges on the transition metal are
equal to the anion’s total charge
3.
Cr2S3
Chromium (III) Sulfide
2(Cr +3) 3(S - 2)