nomenclature a systematic method of writing chemical formulas and naming compounds
TRANSCRIPT
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Nomenclature
A systematic method of writing chemical
formulas and naming compounds
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Chemical symbols Symbols are used to represent
elements Either one capital letter, or a capital
letter with a lower case letter Know names and symbols of elements:
1 – 30, plus Rb, Cs, Sr, Ba, Ag, Au, Cd, Hg, Pt, Sn, Pb,
Br, I, and U
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Chemical formulas Formulas are used to represent
compounds All formulas have more than one
symbol Two or more capital letters
All chemical names have two words No need to capitalize words in name
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I. Binary Ionic nomenclature Binary = two elements Ionic means cation and anion Cations (+ ions) are usually metals Anions (- ions) are usually nonmetals Therefore:
Two elements, one metal and one nonmetal
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a) naming them Name the metal Name the nonmetal, changing the
ending to “ide” Example: name MgCl2 Mg = magnesium
Cl = chlorine, so write “chloride”
Name is magnesium chloride
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Name these NaF Na is sodium F is fluorine, so write fluoride sodium fluoride Al2O3
Al is aluminum O is oxygen, so write oxide aluminum oxide
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Name these Ca3P2
Ca is calcium P is phosphorus, so write phosphide calcium phosphide K3N K is potassium N is nitrogen, so write nitride potassium nitride
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Name these BaS Ba is barium S is sulfur, so write sulfide barium sulfide SrI2 Sr is strontium I is iodine, so write iodide strontium iodide
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Name these Mg3N2
Mg is magnesium N is nitrogen, so write nitride Magnesium nitride BeI2 Be is beryllium I is iodine, so write iodide beryllium iodide
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Nomenclature
A systematic method of writing chemical
formulas and naming compounds
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I. Binary Ionic nomenclature Binary = two elements Ionic means cation and anion Cations (+ ions) are usually metals Anions (- ions) are usually nonmetals Therefore:
Two elements, one metal and one nonmetal
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a) naming them Name the metal Name the nonmetal, changing the
ending to “ide” Example: name MgCl2 Mg = magnesium
Cl = chlorine, so write “chloride”
Name is magnesium chloride
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Name these BaS Ba is barium S is sulfur, so write sulfide barium sulfide SrI2 Sr is strontium I is iodine, so write iodide strontium iodide
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b) Writing formulas Notice: subscripts in the name did not effect
the naming of these compounds So, where do the subscripts come from? Why are they there?
1) The subscripts are there to balance charges**ALL IONIC COMPOUNDS ARE NEUTRAL**
2) The subscripts tell us how many of each element are present in the finished formulaExample: Al2S3 means 2 aluminums and three
sulfurs in one “formula unit”
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b) Writing formulas1) Write the symbol for each ion
• the element and its charge
2) Balance the charges• The total (+) charge must equal the total
(-) charge• “criss cross”
3) Re-write the formula without any charges
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Write the formula for: barium phosphide barium is Ba, the charge is 2+ (column
2A) phosphide was phosphorus, so P;
charge is 3- (column 5A)
Ba2+P3-
Criss-cross to balance charges (2+ with 3-) Ba3P2
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Write the formula for: sodium bromide Sodium is Na, the charge is 1+ (column 1A)
Bromide was bromine, so Br; charge is 1- (column 7A)
Na+Br-
Charges are already balanced (1+ with 1-)
Re-write as NaBr
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Write the formula for: calcium iodide calcium is Ca, the charge is 2+ (column 2A) iodide was iodine, so I; charge is 1-
(column 7A) Ca2+I- Criss-cross to balance charges (2+ with
-) Ca1I2 Re-write as CaI2
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Write the formula for: potassium phosphide potassium is K, the charge is 1+ (column
1A) phosphide was phosphorus, so P; charge
is 3- (column 5A) K+P3-
Criss-cross to balance charges (+ with 3-) K3P1
Re-write as K3P
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Write the formula for: magnesium oxide magnesium is Mg, the charge is 2+
(column 2A) oxide was oxygen, so O; charge is 2-
(column 6A) Mg2+O2-
Charges are already balanced (2+ with 2-)
Re-write as MgO
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Special case
Zinc (Zn) is always a 2+ ion Silver (Ag) is always a 1+
ion These must be memorized
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II. Transition metal ionic nomenclature
Transition metals form several possible cations
Example: manganese (Mn) is found as 2+, 3+, 4+, 5+, 6+ and 7+ ion!
There is no compound just called “manganese oxide” – there are at least four compounds that are different manganese oxides
Different charges result in different subscripts
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II. Transition metal ionic nomenclature
Iron is commonly found as both Fe2+ and Fe3+
Fe2+ is called iron(II) Fe3+ is called iron(III) and,… Cu+ is called copper(I) Cu2+ is called copper(II), etc…
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II. Transition metal ionic nomenclature
Lead (Pb) and tin (Sn) behave like the transition metals, and therefore follow the same rules
Pb2+ is lead(II) Sn4+ is tin(IV) Zinc and silver DO NOT follow
these rules, because zinc is always Zn2+ and silver is always Ag+
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a) Writing formulas Follow the same rules as the other ionic
compounds Iron(II) oxide is Fe2+O2-
Charges balance, so formula is FeO Iron(III) oxide is Fe3+O2-
Criss cross to balance charges Fe2O3
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Write the formula for: vanadium(III) oxide vanadium is V, the charge is 3+ (roman numeral III)
oxide was oxygen, so O; charge is 2- (column 6A)
V3+O2-
Criss cross to balance charges (3+ with 2-)
Re-write as V2O3
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Write the formula for: Cobalt (II) iodide Cobalt is Co, the charge is 2+ (roman numeral II)
iodide was iodine, so I; charge is 1- (column 7A)
Co2+I-
Criss cross to balance charges (2+ with 1-)
Re-write as CoI2
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Write the formula for: Lead(IV) sulfide lead is Pb, the charge is 4+ (roman numeral IV)
sulfide was sulfur, so S; charge is 2- (column 6A)
Pb4+S2-
Criss cross to balance charges (4+ with 2-)
Re-write as Pb2S4
Reduce subscripts!! PbS2
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b) Writing names Same rules as other ionic
compounds, except… You must write a roman numeral in
parentheses after the name of the metal to show what the positive charge on the metal is
Only do this with transition metals And Pb, Sn But not Zn, Ag
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Name these NiCl2 Ni is nickel, and it is a transition metal Cl is chlorine, so write chloride nickel( ? ) chloride But, what is the roman numeral? Note: uncriss cross subscripts to
determine charges Ni2+Cl-
nickel(II) chloride
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Name these CuS Cu is copper, and it is a transition metal S is sulfur, so write sulfide copper( ? ) sulfide But, what is the roman numeral? Note: no subscripts, so charges are
balanced S is always 2-, so the copper in this compound
must be 2+ ! copper(II) sulfide
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Name these Cu3N Cu is copper, and it is a transition
metal N is nitrogen, so write nitride copper( ? ) nitride But, what is the roman numeral? Note: subscripts, so charges are
not balanced copper(I) nitride
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Name these Co3P2
Co is cobalt, and is a transition metal P is phosphorus, so write phosphide cobalt(?) phosphide But, what is the roman numeral? Note: un-crisscross subscripts to
determine charges Co2+P3-
cobalt(II) phosphide
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Name these PbO2
Pb is lead, and it behaves like transition metals
O is oxygen, so write oxide lead( ? ) oxide But, what is the roman numeral? Note: subscripts show charges are not
balanced lead(II) oxide, right? NO!
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Name these PbO2
Careful - O is oxide – and is always 2- So the total (-) charge is 4-! So, what is the roman numeral? To balance the 4- charge, you need a
4+ charge lead(IV) oxide, right? YES!
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Be careful… When the charges become
subscripts that can be reduced Examples: 4+/2- SnO2 is tin(IV) oxide 6+/3- CrP2 is chromium(VI)
phosphide 6+/2- MnS3 is manganese(VI) sulfide
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Nomenclature
A systematic method of writing chemical
formulas and naming compounds
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III. Polyatomic Ionic nomenclature Polyatomic ions are groups of
atoms covalently bonded together, that act as a single ion
Think of them as lego blocks that have been glued together
Each have a name and charge that must be memorized
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Nitrate: NO31-
bicarbonate: HCO3
1-
Image source: wikipedia
Polyatomic ions
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carbonate: CO32-
acetate: C2H3O21-
or CH3COO-
Image source: wikipedia
Polyatomic ions
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Polyatomic ions
1+ ions Ammonium
NH4+
1- ions Nitrate
NO3-
Hydroxide OH-
Bicarbonate HCO3
-
Permanganate MnO4
-
Acetate C2H3O2
-
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Polyatomic ions
2- ions Sulfate
SO42-
Carbonate CO3
2-
3- ions phosphate
PO43-
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a) Writing names Same as before: Write the name of the cation Write the name of the anion Simply write the polyatomic ion’s
name as it is, without any changes Still only two words in the name
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NaNO3
More than two capital letters, so there must be at least one polyatomic ion in the formula
Na is sodium, so… The entire “NO3 part” must have a
one word name: Nitrate is NO3
-
sodium nitrate
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Al2(SO4)3
More than two capital letters, so there must be at least one polyatomic ion in the formula
Al is aluminum, so… The entire SO4 part must have a
one word name: Sulfate (SO4
2-) aluminum sulfate
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(NH4)3PO4
Obviously more than two elements Look for polyatomic ions “NH4” is ammonium “PO4” is phosphate Ammonium phosphate
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b) Writing formulas Follow the same rules as the other
ionic compounds Iron(II) sulfate is Fe2+SO4
2-
Charges balance, so formula is FeSO4
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b) Writing formulas Iron(III) sulfate is Fe3+ SO4
2-
Criss cross to balance charges But: we don’t want Fe2SO43
There aren’t 43 oxygens! Use parentheses around polyatomic
ion Fe2 (SO4)3
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Write the formula for: Chromium(III) carbonate Cr3+ CO3
2-
Crisscross to balance charges Cr2(CO3)3
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Write the formula for: Magnesium hydroxide Mg2+ OH-
Crisscross to balance charges Mg(OH)2
you need parentheses around the hydroxide because it is a polyatomic ion, even though it has no subscripts of it’s own.
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Now – the trickiest ones Name the formula FeSO4
Iron(IV) sulfate? No – the subscript 4 is not from
balancing charges! So, how do you know? Look for subscripts from balancing
charges to “uncrisscross”
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FeSO4
If the 4 were from balancing charges, the formula would have parentheses around the SO – Fe(SO)4
There is no subscript on the Fe – or on the SO4 – from balancing charges
So, the charges are balanced Use the “SO4” part to determine the
charge on the iron – sulfate has a 2- charge
Iron(II) sulfate
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Must be memorized… Ag+, Zn2+, no roman numeral when
naming Sn, Pb get roman numerals when
naming Cr, Mn, Sn, Pb – the total negative
charge must be determined to get the positive charge Cannot “uncrisscross” these
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Nomenclature
A systematic method of writing chemical
formulas and naming compounds
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Types of compounds All compounds are made of two or more
elements held together by chemical bonds
Ions of opposite charges are held together by ionic bonds
Ionic bonding is non-directional There are no “ionic molecules” Formulas of ionic compounds show the ratio
of cation to anion Ionic compounds only exist in the solid
state, in a 3-D crystal lattice
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Covalent compounds are made of elements two or more held together by covalent bonds
Covalent bonding is directional Between two individual atoms
A group of covalently bonded atoms is referred to as a “molecule”
Covalent compounds are also referred to as “molecular” compounds
Types of compounds
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Binary Molecular Nomenclature
Two nonmetals no charges to balance multiple subscripts possible ex: N2O, NO, NO2, N2O4, N2O5
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Use prefixes to represent subscripts
mono = 1 di = 2 tri = 3 tetra = 4 penta = 5
hexa = 6 hepta = 7 octa = 8 nona = 9 deca = 10
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NEVER, EVER, EVER, EVER, EVER, EVER,
EVER,
USE PREFIXES WITH A METAL!
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Rules, continued.. Change second name to end
in “ide” do not use prefixes on the first
word if the prefix is “mono” always use prefixes on the
second name
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Examples... CO2
carbon = first word subscript = 1, so no prefix oxide = second word subscript = 2, so prefix = di carbon dioxide
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Examples... CO carbon = first word subscript = 1, so no prefix oxide = second word subscript = 1, so prefix = mono carbon monoxide
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Try to name these…
N2O
dinitrogen monoxide
NO nitrogen monoxide NO2
nitrogen dioxide
N2O4
dinitrogen tetroxide
N2O5
dinitrogen pentoxide
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Writing formulas... Dinitrogen tetroxide di = 2, so two nitrogen’s tetra = 4, so 4 oxygens N2O4
Note: do NOT reduce subscripts for molecular compounds