From cu 2 add h 2 so 4 to have baso 4 which is

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from Cu2+, add H2SO4 to have BaSO4 which is insoluble in water(Reference: Chang 4.24)
Give the oxidation number of the underlined atoms in the following molecules and ions: (7 points)
+7
CH4-4C2H2 -1C2H4 -2K2CrO4 +6K2Cr2O7 +6KMnO4 +7NaHCO3 +4O2 0NaIO3 +5K2O-2PF6 +6AuCl4 +4(Reference: Chang 4.47)For the following reactions, identify the type (combination, combustion, decomposition, displacement, methathesis [double-displacement)] neutralization), balance the reaction, and for the redox reactions identify the oxidizing agent and reducing agent. (12 points)(a) CH4+ 2O2CO2+ 2H2O combustion(b) HCl + NaOH H2O + NaCl decomposition(c) 2H2+ O22 H2O combustion(d) CaCO3+ HCl CaCl2+ CO2+ H2O redox (e) Zn + HCl ZnCl2+ H2 Displacement(f) 2NaCl 2Na + Cl2 decompositionCalculate the molarity of each of the following solutions: (4 points)
9.00 g of sodium chloride (NaCl) in 86.4 mL of solution
Calculate the mass of KI in grams required to prepare 5.00 × 102mL of a 2.80 M solution. (3 points)
How many grams of NaCl are required to precipitate most of the Ag+ ions from 2.50 ×102 mL of 0.0113 M AgNO3 solution? Write the net ionic equation for the reaction. (5 points)

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