Chapter 3 notes - CHM 1025 Chapter 3 1 Ionic and Molecular...

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Chapter 3 Toyota 1 CHM 1025 Chapter 3 1. Ionic and Molecular Compounds a. Electrolytes are substances that _____________ or ___________ into aqueous ions when dissolved in water forming solutions that conduct electricity b. Nonelectrolytes do not conduct electricity when dissolved in water c. A simple lightbulb apparatus can be used to test for conductivity—if ions are in solution, the circuit is closed and the bulb lights up. d. Compounds can be separated into Ionic Compounds and Molecular Compounds . i. Binary Compounds are composed of only two elements Ionic Compounds Molecular Compounds When dissolved in water: When dissolved in water: Crystalline solid Gas, liquid, or solid Hard, brittle solid Soft solid Very high MP Low MP Very high BP Low BP Strong electrolyte in aqueous solution Weak electrolyte or nonelectrolyte in aqueous solution Electrical conductivity good when compound is molten Electrical conductivity is poor in pure form 2. Ionic Compounds a. A monatomic ion is the ion of a single atom i. Nonmetal ions are named with “-ide” suffix; metal ions are simply called ions of the element 1. S -2 is the sulfide ion 2. Mg +2 is the magnesium ion ii. Transition metals 1. Can have more than one oxidation state. 2. Specify the oxidation state with Roman numerals (Stock system) a. Mn +2 ; manganese(II) ion b. Mn +3 ; manganese(III) ion Pure water Tap water Aqueous sugar solution Aqueous NaCl solution Aqueous acetic acid solution Aq. hydrochloric acid
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