1Lecture 3Reading: chapter 2 section 8 and chapter 3 section 1Homework 2: chapter 2: 18, 20, 24, 38, 42, 44, 46, 48, 50, 52, 54, 56, 60, 62, 64, 66, 68Due: Thursday, Oct. 4•Ionic compoundsare composed of oppositely charged ions held together by electrostatic attraction.Ionic Compounds Examples •Na++ Cl-ÆNaCl•Zn2++ S2-ÆZnS•Ca2++ F-ÆCaF2•Al3++ O2-ÆAl2O3•K++ SO42-ÆK2SO4•NH4++ S2-Æ(NH4)2S •The total negative charge must be equal to the total positive charge. ÆThis allows us to accurately predict the ratios of each type of ion in a binary ionic compound.
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2Naming Inorganic CompoundsIonic compoundsNaming of cations:•Cations have the same name as the metal. Example: Na+= sodium ion.•If the metal can have more than one possible charge, then the charge is indicated by a Roman numeral in parentheses following the metal name.Examples: Cu+= copper(I); Cu2+= copper(II).•Cations formed from non-metals end in -ium.Example: NH4+ammoniumion; H3O+hydroniumion.