CHEM151Take-home Q9 Key

Chemistry (MasteringChemistry Series)

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Unformatted text preview: Name Take‐Home Quiz #9 (DUE Monday November 17th, 2008) Key Date Score Read Carefully: Predict the products, identify the type of reaction (double replacement, acid/base, single replacement, combustion, combination, decomposition), and balance. If it is a type of double replacement reaction also include the total ionic and net ionic equations. If it is a type of redox reaction identify the element that is oxidized and the element that is reduced. Also identify the oxidizing and reducing agents. 1) 2Na(s) + 2H2O(l) 2NaOH(aq) + H2(g) Single Replacement – Type of Redox 2Na0(s) + 2H+2O2‐(l) 2Na+O2‐H+(aq) + H20(g) Na: 0 +1 Oxidized & Reducing Agent H: +1 0 Reduced & Oxidizing Agent 2) 2C3H7OH(l) + 9O2(g) 6CO2(g) + 8H2O(g) Combustion Reaction – Type of Redox 2C+23H+7O2‐H+(l) + 9O02(g) 6C+4O2‐2(g) + 8H+12O2‐(g) C: +2 +4 Oxidized & Reducing Agent O: 0 2‐ Reduced & Oxidizing Agent H: +1 +1 Did nothing 3) H3PO4(aq) + 3 KOH(aq) 3H2O(l) + K3PO4(aq) Acid/Base – Type of double rep. 3H+(aq) + PO43‐(aq) + 3K+(aq) + 3OH‐(aq) 3H2O(l) + 3K+(aq) + PO43‐(aq) 3H+(aq) + 3OH‐(aq) 3H2O(l) 4) Mg(s) + Cl2(g) MgCl2(s) Combination – Type of Redox Mg0(s) + Cl20(g) Mg2+Cl‐2(s) Mg: 0 2+ Oxidized & Reducing Agent Cl: 0 ‐1 Reduced & Oxidizing Agent 5) CaCO3(s) + heat CaO(s) + CO2(g) Decomposition – Type of Redox Ca2+C+4O2‐3(s) + heat Ca2+O2‐(s) + C4+O2‐2(g) No oxidation changes. Therefore, nothing oxidized/reduced 6) Ca(NO3)2(aq) + 2 LiOH(aq) Ca(OH)2(aq) + 2 LiNO3(aq) Double Replacement Ca2+(aq) + 2NO3‐(aq) + 2Li+(aq) + 2OH‐(aq) Ca2+(aq + 2OH‐(aq) + 2Li+(aq) + NO3‐(aq) No Reaction: therefore no net ionic equation 7) K2CO3(aq) + 2HCl(aq) 2KCl(aq) + H2O(l) + CO2(g) Double Replacement 2K+(aq) + CO32‐(aq) + 2H+(aq) + 2Cl‐(aq) 2K+(aq) + 2Cl‐(aq) + H2O(l) + CO2(g) CO32‐(aq) + 2H+(aq) H2O(l) + CO2(g) Identify the oxidation numbers on each of the elements in the following compounds 8) H+13P+5O2‐4 : H = +1, P = +5, O = ‐2 9) Ca+2 (N+5O2‐3)2 : Ca = +2, N = +5, O = ‐2 10) Ca2+C+4O2‐3 : Ca = +2, C = +4, O = ‐2 ...
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This document was uploaded on 09/27/2011.

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