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Compound Names and Formulas


Binary Ionic Compounds. Compounds composed of a metal cation and a nonmetal anionFirst name is the name of the metalSecond name is the name of the nonmetal with an ide suffixEx. NaCl is sodium chloride. Molecular Binary compounds. Composed of two elements both of which are nonmetals.No ions pre

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Compound Names and Formulas

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Compound names and formulas l.jpg

Compound Names and Formulas

  • Binary Ionic Compounds

  • Binary Molecular Compounds

  • Polyatomic Ionic Compounds

  • Organic Hydrocarbons

  • Acids


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BinaryIonic Compounds

  • Compounds composed of a metal cation and a nonmetal anion

  • First name is the name of the metal

  • Second name is the name of the nonmetal with an ide suffix

  • Ex. NaCl is sodium chloride


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Molecular Binary compounds

  • Composed of two elements both of which are nonmetals.

  • No ions present

  • First name is name of the first element with prefix

  • Second name is name of second element with prefix

  • Prefix indicates subscript number: mono, di, tri, tetra, penta, hexa, hepta, octa, nona and deca

  • Ex: Carbon monoxide – CO2


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Polyatomic Ionic Compounds

  • Composed of metal cation and anion made up of two or more nonmetal atoms with a net negative charge

  • First name is name of metal cation

  • Second name is name of polyatomic anion

  • Ex. Sodium sulfate – Na2SO4


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Organic Compounds

  • Hydrocarbons are made up of carbon and hydrogen atoms

  • Alkanes have the formula: CnH2n+2

  • Prefix defines the n value: n=1-9 meth, eth, pro, but, pent, hex, hept, oct, non, and dec

  • Name ends with ane suffix

  • Ex: methane – CH4


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Binary Acids

  • All acids contain hydrogen ion: H+

  • In binary acids the anions is a monoatomic nonmetal anion

  • Generic formula: HA

  • Prefix: hydro Suffix: ic

  • Ex. Hydrochloric acid - HCl


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Polyatomic Acids

  • All acids contain hydrogen ion: H+

  • In polyatomic acids the anion is a polyatomic anion

  • Generic formula: HA

  • Prefix: none(unless polyatomic anion name has one) Suffix: ic(ate) or ous(ite)

  • Ex. chloric acid – HClO3

  • Ex: hypochlorous acid – HClO


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Writing formula for ionic compounds from formula

  • MxAy will be MyAx

  • Example: Calcium(2+) nitrate(1-) – Ca(NO3)2

  • Ammonium(1+) carbonate (2-) – (NH4)2CO3


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Writing Molecular formula from name for binary molecular formulas

  • Prefix indicates subscripts for that element

  • Dinitrogen pentoxide: N2O5


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Writing Alkane formula from name

  • Prefix indicates carbon subscript, H subscript is 2n+2

  • Ethane: C2H6


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Writing Acid Formula from Name

  • First determine if it is binary, it will have a hydro prefix and ic suffix

  • All acid formulas begin with hydrogen ion

  • Treat them like an ionic binary compound

  • Determine anion element and charge

  • Ex: hydrosulfuric acid – H2S


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Polyatomic acids

  • Determine the anion and its charge

  • Treat it like a polyatomic ionic compound

  • Ex: nitric acid – HNO3

  • Ex: phosphoric acid – H3PO4


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Quiz Time!


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Identify the formula for:barium nitrate

  • A. Ba3N2

  • B. Ba(NO2)2

  • C. BaNO2

  • D. BaNO3

  • E. Ba(NO3)2


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Identify the formula for:chromium (III) phosphate

  • A. Cr3PO3

  • B. Cr3(PO4)2

  • C. Cr2(PO4)3

  • D. CrPO4

  • E. Cr3(PO4)3


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Identify the formula for:Ammonium nitrate

  • A. NH4NO3

  • B. NH4NO2

  • C. NH3NO3

  • D. NH3NO2

  • E. (NH4)NO2


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Identify the formula for:Copper (II) bromide

  • A. CuBr

  • B. CuBrO3

  • C. Cu(BrO3)2

  • D. CuBr2

  • E. Cu(BrO4)2


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Identify the formula for:Copper (II) bromide

  • A. CuBr

  • B. CuBrO3

  • C. Cu(BrO3)2

  • D. CuBr2

  • E. Cu(BrO4)2


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Identify the formula for:Sulfur Hexafluoride

  • A. SF

  • B. SF6

  • C. SF4

  • D. S4F6

  • E. SF8


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Identify the formula for:Octane

  • A. C6H6

  • B. C6H12

  • C. C8H8

  • D. C8H16

  • E. C8H18


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Identify the formula for:Hydroiodic Acid

  • A. HI

  • B. H2I

  • C. HIO3

  • D. HIO2

  • E. HIO4


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Identify the formula for:Sulfuric Acid

  • A. HS

  • B. H2S

  • C. H2SO4

  • D. H2SO3

  • E. H3SO3


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Identify the formula for:Tetraphosphorus Decoxide

  • A. PO5

  • B. P2O5

  • C. P4O8

  • D. P4O10

  • E. P5O10