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The questions cover sampling and composite sampling, defining aliquots, homogeneous samples, decanting procedures, standard solutions, masking and interference, relationships between qualitative and quantitative analysis, calibration and detector response, measurement uncertainty, and communicating results for unknown samples. 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Harris/W.H. Freeman. Each chapter comes with a number of multiple choice-type questions. Understanding each of these questions is crucial for this course, particularly for preparing the ACS standardized exams. You are strongly encouraged to work on ALL of them and use them to test your knowledge or guide you on reviewing specific chapters. A few of the same or similar questions might be chosen for the course examinations.  \nDepartment of Chemistry and Biochemistry  \nUniversity of Southern Mississippi Overall 2  \nCHE 311 Class Practice  \nChapter 00-Analytical Process and Sampling  \n\n| 1 of 15\u003Cbr>A chemical firm was hired to monitor a nearby lake for possible mercury contamination. Several samples were taken at different locations around the lake, including water samples, lake bottom samples, and plant samples. When the chemist returned to the laboratory, the water samples were the first to be analyzed. The analysis began by removing a number of aliquots. An aliquot is\u003Cbr>(a) a measure of the contamination of the lake water.\u003Cbr>(b) a combined measure of the contamination in the lake.\u003Cbr>(c) a precise liquid sample taken for analysis. |\n| --- |\n| 2 of 15\u003Cbr>The sampling technique is very important when analyzing a large area or vast amounts of material because you cannot analyze everything. When preparing a composite sample, a chemist would\u003Cbr>(a) take several samples at random from pre-planned locations in the bulk sample and analyze each.\u003Cbr>(b) take representative samples from various areas of the bulk samples and combine them for analysis.\u003Cbr>(c) analyze as much of the bulk sample as possible. |\n\n3 of 15  \nThe steps in a chemical analysis are  \n(a) 1 . Formulate the question.  \n2. Select the analytical procedure.  \n3. Sample.  \n4. Prepare the sample.  \n5. Make replicate measurements ofthe sample.  \n(b) 1 . Select the analytical procedure.  \n2. Sample.  \n3. Prepare the sample.  \n4. Make replicate measurements ofthe sample.  \n5. Make a clear and complete written report of your findings.  \n(c) 1 . Formulate the question.  \n2. Select the analytical procedure.  \n3. Sample.  \n4. Prepare the sample.  \n5. Make replicate measurements ofthe sample.  \n6. Make a clear and complete written report of your findings.  \n\n| 4 of 15\u003Cbr>A chemist following a procedure carefully was asked to decant a solution. This means (a) stir the solution thoroughly to suspend the solids and pour the mixture into a filtering apparatus.\u003Cbr>(b) allow any solid material to settle to the bottom of the flask, and then pours off the liquid above the solution.\u003Cbr>(c) pour the solution from one flask to another. |\n| --- |\n| 5 of 15\u003Cbr>A sample is said to be homogeneous if (a) the sample is the same throughout.\u003Cbr>(b) the sample has a different composition in different parts of the sample.\u003Cbr>(c) the sample can be separated into the individual components by filtering the sample.\u003Cbr>|\n| 6 of 15\u003Cbr>When performing an analysis a chemist often uses a standard solution. What is a standard solution?\u003Cbr>(a) A solution that complies with standards established by the Environmental Protection Agency.\u003Cbr>(b) A solution that has a concentration of a chemical that is known to a high degree of certainty.\u003Cbr>(c) A solution that is prepared from a chemical that has been designated as a primary standard. |\n\n7 of 15  \n2  \nIn discussing quantitative and qualitative analysis one could say  \n(a) the two terms are commonly used interchangeably.  \n(b) quantitative analysis deals with determining what materials may be present in a sample.  \n(c) quantitative analysis deals with the quantity of a material present in a sample.  \n\n| 8 of 15\u003Cbr>The term masking generally refers to\u003Cbr>(a) removing any material that may i","cbCaiabl7Axi9RfL","https://ap.wps.com/l/cbCaiabl7Axi9RfL","pdf",2924282,161,"English","# Chapter 00-Analytical Process and Sampling\n## Sampling concepts and aliquots\n## Composite sampling and analytical steps\n## Decanting and sample properties\n## Standard solutions, masking, and interference\n## Quantitative transfers, calibration, and uncertainty\n## Unknown sample analysis and reporting","[{\"question\":\"What is an aliquot in lake-water sampling, according to the quiz?\",\"answer\":\"An aliquot is a precise liquid sample taken for analysis (option c).\"},{\"question\":\"Why is sampling technique important for large areas or vast amounts of material?\",\"answer\":\"Because you cannot analyze everything, so sampling must be planned carefully; composite sampling uses representative portions for analysis (option b).\"},{\"question\":\"What makes analysis of an unknown sample meaningful?\",\"answer\":\"Collect the sample properly and take measures to ensure the reliability of the analytical method, then communicate results clearly and completely (option b).\"}]","CHE 311 Analytical Chemistry - Chapter Quizzes | PDF",1789995126,406]