© Carey Munoz Nomenclature Writing Names from Formulas

© Carey Munoz First, fold your paper in half like this. Not this.

© Carey Munoz You need four “flaps.” Do not write these numbers on your flaps! To cut “flaps,” cut only the top half of the folded paper. 1234

© Carey Munoz There are four flaps of information. The compound starts with a Group 1,2 or 13 metal The compound starts with a transition metal or Sn, Bi or Pb The compound starts with a nonmetal The compound starts with H Note – Ag, Zn and Cd don’t need roman numerals Ag is always Ag + Zn is always Zn 2+ Cd is always Cd 2+ Cation + Anion

© Carey Munoz Special Information It is ionic. The subscripts are present to balance the charges of the ions. The subscripts are not used in the name. To write the name of the formula Special Information It is ionic. The subscripts are present to balance the charges of the ions. The subscripts are not used in the name. To write the name of the formula Write name of cation Write the name of the anion Make sure ending is –ide. Either ion may be a polyatomic ion; use its name.

© Carey Munoz Examples NaCl Sodium Chloride NH 4 NO 3 Ammonium Nitrate Al 2 O 3 Aluminum Oxide

© Carey Munoz Write name of cation (the positive metallic ion; it is first) Write the name of the anion (the negative nonmetallic ion; it is second) Change ending to –ide. Either ion may be a polyatomic ion; use the name of the ion. Write name of cation (the positive metallic ion; it is first) Write the name of the anion (the negative nonmetallic ion; it is second) Change ending to –ide. Either ion may be a polyatomic ion; use the name of the ion. To write the name of the formula Write name of cation The cation needs a roman numeral that represents the charge (+1 → I; +2 → II; +3 → III; +4 → IV) Write the name of the anion Make sure ending is –ide. The anion may be a polyatomic ion; use the name of the ion. To figure out the charge of the cation: Determine the charge of the anion – the negative part. Determine what charge is required for the cation to balance the anion.

© Carey Munoz Examples Fe 2 O 3 Iron(III) Oxide CuSO 4 Copper(II) Sulfate Pb(NO 3 ) 4 Lead(IV) Nitrate Fe 2 O CuSO Note – the “4” is part of the polyatomic ion sulfate; it is not there to balance charges Pb(NO 3 ) The positive charge of the cation is determined by balancing the overall negative charge of the anion. Examples

© Carey Munoz Prefixes 1 – Mono 2 – Di 3 – Tri 4 – Tetra To write the name of the formula Write the name of the first element – remember it is a nonmetal. Write the name of the second element – it’s also a nonmetal. Change ending to –ide. Use prefixes that go with the subscript for each element. Prefixes 5 – Penta 6 – Hexa 7 – Hepta 8 – Octa Prefixes 9 – Nona 10 – Deca Note – the prefix “mono” is not used with the first element. To write the name of the formula Write the name of the first element – remember it is a nonmetal. Write the name of the second element – it’s also a nonmetal. Change ending to –ide. Use prefixes that go with the subscript for each element.

© Carey Munoz Examples CO Carbon Monoxide CO 2 Carbon Dioxide N 2 O 4 Dinitrogen Tetroxide P 4 O 10 Tetraphorphorus Decoxide Note – the prefix “mono” is not used with the first element in either of these examples.

© Carey Munoz To write the name of the formula Determine the name of the anion. If the anion ends in “ide”, then the acid is named like this: hydro___________ ic acid If the anion ends in “ate”, then the acid is named like this: __________ ic acid If the anion ends in “ite”, then the acid is named lilke this: __________ ous acid

© Carey Munoz Acid Formula Anion Formula Anion Name Acid Name HF F-F-F-F- Fluoride Hydrofluoric Acid H 2 SO 4 SO 4 2- Sulfate Sulfuric Acid H 2 SO 3 SO 3 2- Sulfite Sulfurous Acid