Writing formulas from name-Trans M & M not in G1& G2 & NM -
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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Step 1 | write the cation formulas first, including charge
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Rule 1a | Roman numeral in parentheses specify the cation charge
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Step 2 | Write the anion formulas, including charge
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Step 3 | Combine enough cations w/ enough anions to give a total charge of zero
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Rule 3a | Don't write charges when the ions are combined
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Trick 3a | Swap charges as subscripts
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Copper (I) chloride | Copper (I) indicates Cu+ and chloride ions (G7) always forms Cl- ; Cu+ and Cl- combine to give CuCl
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Chromium (III) oxide | Chromium (III) indicates Cr3+ and O (G6) always forms O2 ; Cr3+ and O2- combine to give Cr2O3
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Step 4 | Use the simplest (lowest) cation-to-anion ratio possible
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Tin (IV) sulfide | Tin (IV) indicates Sn4+ and S (G6) always forms S2-; Sn4+ and S2- combine to give SnS2, not Sn2S4
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Most transition metals have +2/+3 ions, w/ few ___'s | 1
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Pb & Sn have +?/+? ions | 2,4
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