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Unformatted text preview: Version 057/AADCB Quiz 4 Qual precipitation lyon (51155) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 1 2 3 4 5 6 7 AA AB AC AD BA BB BC 8 9 10 BACK NEXT BD CA CB CC CD Blue = correct answer; Red = incorrect answer; Greenish-gray = already answered question. 001 10.0 points Which of the following is a SOLUBLE com- pound in dilute aqueous solution? 1. PbI 2 2. CuCO 3 3. BaSO 4 4. NH 4 Cl correct 5. FeCrO 4 Explanation: All compounds containing alkali metals (Group IA metals) and ammonium ion are soluble in dilute solutions. Li + Na + K + Rb + Cs + NH + 4 All compounds containing nitrate, chlorate, perchlorate, and acetate are soluble in dilute solutions. NO 3- ClO 3- ClO 4- CH3COO- The above ions are almost always spectator ions in dilute aqueous solution. BaSO 4 and AgCl are solids in aqueous solution. 002 10.0 points How does quantitative analysis differ from qualitative analysis in terms of the informa- tion you are interested in? 1. In quantitative analysis you want to know how much sample is present, and in qualita- tive analysis you want to determine what the sample is. correct 2. Qualitative analysis improves the results of quantitative analysis. 3. Qualitative analysis is higher quality than quantitative analysis. 4. Qualitative analysis and quantitative analysis are both intended to determine the same information, they just do it through dif- ferent means. Explanation: Qualitative analysis determines what some- thing is (for example, is the acid HCl, H 2 SO 4 , or HNO 3 ?). Quantitative analysis is a mea- sure of how much of something, and the an- swer is always a number (for example, what is the concentration of the acid?)....
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- Fall '08