Chang_TB_Chapter_4_AK.docx - Chapter 4 Test Bank 12e Chang...

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Chapter 4 Test BankChang12e 1.The diagram below shows three different compounds (AX2, AY2, AZ2) dissolved in water. (a) Refers to AX2, (b) refers to AY2, and (c) refers to AZ2.Which of the following statements is true? a.All the compounds are soluble in water, but AY2 is the most soluble.b.The compound AZ2is insoluble and forms a precipitate.c.Only AY2is soluble in water.d. AY2is the strongest electrolyte.Answer: (d) All three compounds show similar solubility, since all are shown as separate particles. However, since all the particles in AY2are shown as separate ions, this compound has undergone complete dissociation and shows the greatest conduction of an electric current. This question gets at the heart of the difference between solubility and dissociation. LO 2.1; SP7.1;EK 2.A 2.In the following reaction the iodide ion (I-) in HI is oxidized by the permanganate ion (MnO4-). A 5.0 mL solution of 0.20M HI requires 4.0 mL of KMnO4 to completely oxidize all the iodide. What is the molarity of the KMnO4 solution?10 HI + 2 KMnO4+ 3 H2SO45 I2+ 2 MnSO4+ 8 H2O 1
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Chapter 4 Test BankChang12e 3.Solutions A and B contain the same compound dissolved in water. SolutionA is 5.0 L at 0.02 M and solution B is 50 mL at 0.6 M. How many liters of solution A are needed to contain the same number of moles as the 50 mL of solution B? 4.5.0 g of barium nitrate powder is dissolved in water. When excess 0.50 M potassium sulfate solution is added to the solution containing the barium nitrate a reaction occurs as shown in the chemical equation below. How could you use this reaction to determine the purity of the barium nitrate powder? Ba(NO3)2(aq) + K2SO4(aq) BaSO4(s) + 2 KNO3(aq) 4
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