Transcription of Tutorial 2 FORMULAS, PERCENTAGE COMPOSITION, AND …
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Tutorial 2 FORMULAS, PERCENTAGE COMPOSITION, AND …
T-6 Tutorial 2 FORMULAS, PERCENTAGE COMPOSITION, AND THE MOLEFORMULAS: A chemical formula shows the elemental composition of a substance: thechemical symbols show what elements are present and the numerical subscripts show howmany atoms of each element there are in a formula unit. Examples:NaCl: one sodium atom, one chlorine atom in a formula unitCaCl2: one calcium atom, two chlorine atoms in a formula unitMg3N2: three magnesium atoms, two nitrogen atoms in a formula unitThe presence of a metal in a chemical formula indicates an ionic compound, which is composedof positive ions (cations) and negative ions (anions). A formula with only nonmetals indicates amolecular compound (unless it is an ammonium, NH4+, compound). Only ionic compounds areconsidered in this are tables of common ions in your lecture text, p 56 (cations) and p 57 (anions).
– perchlorate Sr2+ strontium SO 3 2– sulfite IO 3 – iodate Ba2+ barium HSO 3 –hydrogen sulfite MnO 4 permanganate Al3+ aluminum SO 4 2– sulfate NO 2 – nitrite Sn2+ tin(II) HSO 4 –hydrogen sulfate NO 3 nitrate Sn4+ tin(IV) S 2O 3 2– thiosulfate OH– hydroxide Pb2+ lead(II)1 CrO 4 2– chromate IO 4 – periodate Bi3+ bismuth Cr ...
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