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by: Luis Turner


Marketplace > James Madison University > Chemistry > CHEM 131 > GENERAL CHEMISTRY I C3T1G2
Luis Turner
GPA 3.72

Mary Tam

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Mary Tam
Class Notes
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This 2 page Class Notes was uploaded by Luis Turner on Saturday September 26, 2015. The Class Notes belongs to CHEM 131 at James Madison University taught by Mary Tam in Fall. Since its upload, it has received 44 views. For similar materials see /class/214170/chem-131-james-madison-university in Chemistry at James Madison University.




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Date Created: 09/26/15
Elements in Redox Reactions Guide on PredictingRedox Reaction Products Combination Reactions Combining Two Elements i Metal and nonmetal form an ionic compound Ex 4Als 302g 92A1203s ii Two nonmetals form a covalent compound Ex N2g 3H2g 92NH3g Combining Compound and Element i Many binary covalent compounds react with nonmetals to form larger compounds ii Many nonmetal oxides react with additional O2t0 form higher oxides those with more 0 atoms in each molecule Ex 2NOg 02g 92N02g iii Many nonmetal halides combine with additional halogen Ex PC131 C12g 9PClss Decomposition Reactions Thermal Decomposition i When energy is absorbed as heat the reaction is a thermal decomposition ii Many metal oxides chlorates and perchloratesrelease oxygen when strongly heated Ex 2KC103s A9 2KCls 302g notice that the lone reactant is the oxidizing AND reducing agent delta A typically above a reaction arrow indicates that heat is required for the reaction Electrolytic Decomposition i In electrolysis a compound absorbs electrical energy and decomposes into its elements Ex 2H20l electricity92H2g 02g EX MgCl2l electricity9Mgl C12 g Displacement Reactions Displacement Reactions Involving Metals i ii iii The reactivity of metals from most reactive to least reactive is provided on page When the reaction involves metals the atom reduces the ion A metal displaces H2 from water or acid a The most reactive metals such as those from Group 1A1 and Ca Sr and Ba from Group 2A2 displace H2 from water EX 2Lis H2Ol 9 2LiOHaq H2g b Less reactive metals require heat to speed the reaction so these metals displace H2 from steam EX 2Als 6H2Og 9 2A1OH3s 3H2g O In all such reactions the metal is the reducing agent and water or acid is the oxidizing agent The least reactive metals such as Ag and Au cannot displace H2 from any source A metal displaces another metal ion from solution 51 EX CuSO4aq Zns9 Cus ZnSO4aq Zinc metaldisplaces copperII ion from sulfate solution EX 2AgNOsaq Cus9CuNOs2aq 2Ags Copper metaldisplaces silver ion from nitrate solution 130 gure 414 Displacement Reactions Involving Halogens i ii Reactivity decreases down Group 7A17 F2 gt C12 gt Br2 gt 12 A halogen higher in the periodic table is a stronger oxidizing agent than one lower down EX 2Br aq Cl2aq 9 Br2aq 2Cl aq


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