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Chem3 Ch5.p3.B.2
Writing formulas from name-Trans M & M not in G1& G2 & NM -
Writing formulas from name | answer |
---|---|
Step 1 | write the cation formulas first, including charge |
Rule 1a | Roman numeral in parentheses specify the cation charge |
Step 2 | Write the anion formulas, including charge |
Step 3 | Combine enough cations w/ enough anions to give a total charge of zero |
Rule 3a | Don't write charges when the ions are combined |
Trick 3a | Swap charges as subscripts |
Copper (I) chloride | Copper (I) indicates Cu+ and chloride ions (G7) always forms Cl- ; Cu+ and Cl- combine to give CuCl |
Chromium (III) oxide | Chromium (III) indicates Cr3+ and O (G6) always forms O2 ; Cr3+ and O2- combine to give Cr2O3 |
Step 4 | Use the simplest (lowest) cation-to-anion ratio possible |
Tin (IV) sulfide | Tin (IV) indicates Sn4+ and S (G6) always forms S2-; Sn4+ and S2- combine to give SnS2, not Sn2S4 |
Most transition metals have +2/+3 ions, w/ few ___'s | 1 |
Pb & Sn have +?/+? ions | 2,4 |