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Nomenclature writing chemical formulas naming chemical compounds. Chapter 5. potassium chromate. potassium dichromate. Sodium and Chlorine. Na Cl. Na + Cl -. NaCl Sodium Chloride Cation 1 st : name of element Anion 2 nd : root and add -ide When combined together

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Nomenclature writing chemical formulas naming chemical compounds
Nomenclaturewriting chemical formulasnaming chemical compounds

  • Chapter 5

potassium chromate

potassium dichromate


Sodium and chlorine
Sodium and Chlorine

  • Na Cl

  • Na+ Cl-

  • NaCl

  • Sodium Chloride

    • Cation 1st: name of element

    • Anion 2nd: root and add -ide

    • When combined together

      • Metals lose e- (+ ion = cation)

      • Nonmetals gain e- (- ion = anion)

      • Ionic Compounds (Type I Binary Ionic)


Magnesium and fluorine
Magnesium and Fluorine

  • Mg F

  • Mg2+ F-

  • MgF2

    • The number of electrons lost must equal the number of electrons gained

    • The total + and - charge must add to 0

      Magnesium Fluoride


Aluminum and oxygen
Aluminum and Oxygen

  • Al O

  • Al3+ O2-

  • Al2O3

  • Aluminum Oxide

    • The number of electrons lost must equal the number of electrons gained

    • Overall charge = 0


Write the chemical formula for strontium sulfide
Write the chemical formula for strontium sulfide

  • SrS

    • You might have criss-crossed to Sr2S2 but then you must reduce it to the lowest whole number ratio.

    • remember always write ionic formula in lowest whole number ratio






Write the chemical name for cabr 2
Write the chemical name for CaBr2

  • Remember:

  • the metal (cation is 1st)

  • the nonmetal (anion is 2nd : root and -ide)

  • Calcium Bromide


Chemical formula for copper fluoride
Chemical formula for copper fluoride

  • Oxidation states for Copper:

  • 1+: Cu(I)

  • 2+: Cu(II)

  • Know F-

  • The number of electrons lost = the number of electrons gained

  • Overall charge = 0

  • so use Cu+ or Cu(I)

  • CuF

  • Roman Numerals refresh

  • 1: I

  • 2: II

  • 3: III

  • 4: IV

  • 5: V

  • 6: VI

  • 7: VII


Chemical formula for copper ii fluoride
Chemical formula for copper(II) fluoride

  • Copper: F-

  • 1+: Cu(I)

  • 2+: Cu(II)

  • CuF2

  • Roman numeral tells you the charge on copper

  • Cu(II) = Cu2+


Write the chemical formula for zinc chloride
Write the chemical formula for zinc chloride

  • ZnCl2

    • Remember that zinc is one of the transition metals that does not require a Roman #, since it’s oxidation state is always +2.


Write the chemical formula for chromium vi sulfide
Write the chemical formula for chromium (VI) sulfide

  • The Roman # tells you the +6 charge on the chromium metal

  • Cr+6S-2

  • You might have criss-crossed to Cr2S6 but then you must reduce it to the lowest whole number ratio.

  • CrS3


Write the name for fe 2 o 3
Write the name for Fe2O3

  • you can un-criss-cross

  • or you can determine the charge on iron by working from the charge on the anion

  • iron(III) oxide


Write the name for ag 2 s
Write the name for Ag2S

  • No need for a Roman # since silver is always

    +1

    (memorize along with Zn and Cd)

    Silver sulfide


Write the name for cu 2 o
Write the name for Cu2O

  • You can “un-criss-cross”

  • or you can work into the cation by knowing that the anion is -2

    • The total + and - charge must add to 0

    • this means that electrons lost = electrons gained

    • the Roman # = the individual oxidation state of one of the metal ions (not the total metal charge)

  • Copper (I) oxide


Write the name for crp 2
Write the name for CrP2

  • you can’t just un-criss-cross because this is a formula which has been reduced.

    • work off the non-metal’s charge

    • remember the total + must equal - that means the e- lost = e- gained

      chromium (VI) phosphide



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