Transcription of Tutorial 2 FORMULAS, PERCENTAGE COMPOSITION, AND …
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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). Acombined table of these same ions can be found on the inside back cover of the lecture text.
The presence of a metal in a chemical formula indicates an ionic compound, which is composed of positive ions (cations) and negative ions (anions). ... 2– dichromate H– hydride Cr3+ chromium(III)2 O2 ... 5There is also a nickel(III) Hg 2 2+ mercury(II) T-8
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