CH204 Expt 2 fall09

CH204 Expt 2 fall09 - Experiment 2 Overview CH204...

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1 1 CH204 Experiment 2 Separation and Recovery of the Components in a Mixture 2 Experiment 2 Overview b Separate a mixture of salt, sand, and chalk dust based on differences in their physical and chemical properties. s Add water to dissolve NaCl. s Add acid to dissolve CaCO 3 . s SiO 2 is left behind in the beaker. 3 Physical properties b Characteristics of a material that do not involve changing the chemical formula of the compound. Examples include: b Boiling point Physical state b Melting point Particle size b Solubility Color b Density Shape b When a compound changes state (solid, liquid, gas, aqueous), it is still the same compound, so that is a physical change, not a chemical change. 4 Chemical properties b Characteristics of a material that DO require changing the chemical formula of the compound. b This means reactivity with another chemical. Examples: s Flammabile s Oxidizes (rust/tarnish/corrosion) s Oxidation/reduction in general s Decomposes s A host of other chemical reactions b The products of a chemical process are different molecules than the reactants. 5 Types of Chemical Reactions B Decomposition reactions single compound decomposes to two or more other substances. B Combination reactions (Synthesis reactions) two substances combine to form a third substance. B Single-replacement reactions (Displacement reactions) an element reacts with a compound and replaces another element in the compound B Double-replacement reactions (Metathesis reactions) Acid/base neutralization (formation of water) Precipitation reactions (formation of a solid) B Combustion reactions a substance reacts with oxygen, usually with the rapid release of heat
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This note was uploaded on 03/17/2010 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas.

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CH204 Expt 2 fall09 - Experiment 2 Overview CH204...

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