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General Chemistry I Exam #4 Mesa Community College, Chemistry 151 Summer Semester, 2016 Dr. Sobers Name This exam is an optional TAKE HOME EXAM that

I have attached a copy of my take home exams can anyone help. need to submit tomorrow. 

Page 1 of 6 General Chemistry I Exam #4 Mesa Community College, Chemistry 151 Summer Semester, 2016 Dr. Sobers Name This exam is an optional TAKE HOME EXAM that is due Wednesday July 20 th . • There are 4 exams. The lowest of the exam scores will be dropped. If you choose not to complete this exam then it will be the dropped exam score. • The exam deadline will be strictly enforced. Here are some answers to possible questions about the exam: Q. I won’t be in class on the due date what should I do? A. Turn it in my box before class or scan and e-mail it to me before class. Q. Should I turn it in if I’m not finished? A. Better to get some points than no points. Q. Can I work with others? A. You should try to work the problems yourself. You are likely to see similar problems again on the final exam. Relying on others for answers will not help you in preparing for the final. Work neatly! No credit is given if the grader cannot read the answer or follow the work. • If typographical errors are discovered during the exam, they will be posted on canvas and announced in class. Good Luck! Answer multiple-choice problems as usual! Write the letter of your answer on the line before the question or statement. If you need to use tables of thermodynamic values, equilibrium constants or standard reduction potentials, these are found in your textbook. This exam is due in class on Wednesday, July 20 th . No exceptions!
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Page 2 of 6 1. Consider the phase diagram of sulfur to the right. Rhombic and monoclinic are two solid allotropes of sulfur. A. Which solid phase has the greater density? Circle answer. Rhombic Monoclinic B. Which phase of sulfur is more stable under standard atmospheric conditions? C. How many triple points are there in the phase diagram? D. Estimate the normal freezing point temperature of sulfur: E. At one atmosphere pressure sulfur is heated from 80°C to 250°C. Describe all phase changes that occur to the sulfur: F. Is this a condensable or permanent gas? (circle answer) Permanent Condensable 2. Below are three alcohols labeled A, B and C. A. CH 3 CH 2 CH 2 OH B. CH 3 CH 2 OH C. CH 3 CH 2 CH 2 CH 2 CH 2 OH (propanol) (ethanol) (pentanol) Which alcohol is least likely to be miscible with water? A B C Which alcohol is most soluble in hexane*? A B C (*Hexane is CH 3 CH 2 CH 2 CH 2 CH 2 CH 3 ) A model of propanol, CH 3 CH 2 CH 2 OH, is shown to the right. Circle the part of this molecule responsible for the most favorable interactions with water: What type of intermolecular forces are the most favorable between propanol and water? Should propanol dissolve in hexane, what type of intermolecular forces are the most favorable between propanol and hexae?
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