C1024PrMidtermSpring2011AnswerKey - Dr Jim Bloxton CHEM...

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Dr. Jim Bloxton CHEM 1024 Practice Midterm Exam Answer Key Spring 2011 These are sample questions that may or may not be used on a final exam. Many other questions that are not found on this sample final exam will be on actual final exams. Learn the basic principles and then be prepared to apply the principles to problems that you have not seen before. The midterm exam will cover all of the material that was scheduled to be covered on the Chem 1024 syllabus in meetings 1-5 in spring semester of 2011 and in the midterm exam review session of meeting 8 which includes Holum Experiment 41: Studies In Structural Organic Chemistry: Isomerism, Holum Experiment 59: Study Of Isomerism via Molecular Models, and Prelab Questions and Supplement to Holum Experiments 41 and 59 Experiments, Chem 1024 (64): Levels of Calcium Ions and Disease Processes, Chem 1024 (64): Levels of Potassium Ions and Disease Processes; and Acidosis and Alkalosis Experiments. This includes all material that was covered or contained in the laboratory supplements, handouts, study guides, laboratory lectures, laboratory experiments, and laboratory report sheets. Test questions can also be drawn from the optional homework assignments from the Chem 1022 Bettlelheim Chem 1022 lecture text. Students are also expected to know the normal pH of blood, normal partial pressure of carbon dioxide in blood and normal concentration of bicarbonate ion in blood. An answer key will be provided for answers to this practice final exam that don’t require the use of a scanner for posting under Course Documents Section of Blackboard. 1. Draw the structures for two enantiomers that have one chiral center and the formula C 3 H 8 ClN. Various answers are possible. H H | | Cl−C−NH 2 H 2 N−C−Cl | | CH 2 CH 2 | | CH 3 CH 3 2. Compounds A and B are enantiomers. Would you expect a mixture that consists of 51% of compound A and 49% of compound B to rotate plane polarized light? Explain. Yes this solution would rotate plane polarized light. This is not a racemic mixture which would consist of 50% of compound A and 50% of compound B. Since there is 51% of compound A, there will be a small amount of rotation of plane polarized light in the direction that a pure solution of plane polarized light would rotate. 3. Draw the expanded structures of propane and 2-methyl propane. Are these molecules isomers? Explain. 1
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H H H H C C C H Full or expanded structural formula for propane H H H H H H H C C C H Full or expanded structural formula for 2-methylpropane or isobutane H H H C H H These molecules are not isomers since they have two different molecular formulas.
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C1024PrMidtermSpring2011AnswerKey - Dr Jim Bloxton CHEM...

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