Which of the following is an example of a

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21. Which of the following is an example of a disproportionation reaction? A) 2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l) B) 2KBr(aq) + Cl2(g) 2KCl(aq) + Br2(l) C) 2H2O2(aq) 2H2O(l) + O2(g) D) CaBr2(aq) + H2SO4(aq) CaSO4(s) + 2HBr(g) E) 2Al(s) + 3H2SO4(aq) Al2(SO4)3(aq) + 3H2(g) 22. Identify the following as either a goodor poorconductor of electricity: a crystal of Na2SO4. 23. Which of the following compounds is a weak electrolyte? A) HCl B) NH3C) C6H12O6 (glucose) D) N2E) KCl
5 CHEM 1411, chapter 4, exercises 24. Based on the solubility rules, which one of the following should be solublein water?
25. Hydrogen is oxidized in the following chemical reaction. H2+ Cl2 2HCl
26. Based on the solubility rules, which one of the following should be solublein water?
27. Which of the following represents a hydrogen displacement reaction? A) 2C2H6(g) + 7O2(g) 4CO2(g) + 6H2O(l) B) 2KBr(aq) + Cl2(g) 2KCl(aq) + Br2(l) C) N2(g) + 3H2(g) 2NH3(g) D) CaBr2(aq) + H2SO4(aq) CaSO4(s) + 2HBr(g) E) 2Al(s) + 3H2SO4(aq) Al2(SO4)3(aq) + 3H2(g) 28. Batteries in our cars generate electricity by the following chemical reaction. Pb + PbO2+ 2H2SO42PbSO4+ 2H2O What is the reducing agent in this process? 29. Identify the majorionic species present in an aqueous solution of Na2CO3. A) Na2+, CO32B) Na2+, C2 , O3C) Na+, C4+, O32D) Na+, C+, O2E) Na+, CO32
6 CHEM 1411, chapter 4, exercises 30. Identify the following compound as an electrolyteor nonelectrolyte: C12H22O11(sucrose). 31. Which of the following compounds is a weak electrolyte?
32. What element is reducedin the following chemical reaction? Cu + 2H2SO4CuSO4+ SO2+ 2H2O
33. 25.0 mL of a 0.2450 M NH4Cl solution is added to 55.5 mL of 0.1655 M FeCl3. What is the concentration of chloride ion in the final solution?

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