Download 5 Questions on Elements of Organic and Biochemistry | CHEM 1301 and more Exams Biochemistry in PDF only on Docsity! Chem 1301 - Elements of Chemistry Instructor: Prof. John R. Sowa, Jr. February 10, 2005 Exam I - 100 points Q1_______ Q2_______ Q3_______ Q4_______ Q5_______ Total_______ Good Luck! 1) (22 points) Answer the following questions. a) (9 pts, 3 ea) Draw the Lewis structure (electron – dot ) structure for each of the following compounds. Please use dashes to represent bonds (—). i) NH3 ii) CH2O iii) CH2Cl2 b) (9 pts, 3 ea) Determine the hybridization for the central atom in the above three compounds. Draw the correct 3-D structure for each compound. i) ii) iii) c) (4 pts) Determine the formal charges in the following molecules: i) ii)C O NH3 CH3 H O O c) This polymer forms a hard plastic which is usually transparent. It is commonly found in food containers and is recognized by the following symbol. d) This liquid molecule can be hydrogenated to make a solid saturated fatty acid known as stearic acid. e) This molecule is used as a general anesthetic. f) This molecule is found in cigarette smoke and charcoal grills. It is a carcinogen. g) This molecule when found in the cis form is responsible for vision. 4. (17 pts) a) (10 pts) Show the Cs and Hs in the following molecules: b) (3 pts) What is the relationship between the following molecules. Circle the best term. Isomers same compounds cis/trans isomers constitutional isomers c) (4 pts) Arrange the following bonds in order of increasing bond length. Shortest longest i) N N H ii) vs. C C C C C C C H 5. (20 pts) Describe the properties of the following compounds? compound Physical state at Room temperature (solid, liquid, gas) Soluble in water or insoluble in water If insoluble: is this compound less dense (float on) or more dense that water (sinks below) Propane Methanol (CH3OH) Methylene chloride (CH2Cl2), d = 1.4 g/mL Acetone H3C CH3 O 2,2,4- trimethylpentane NaCl
