Chemistry 500, Final ExamSpring 1998Dr. HunterYour Name: , Student Number: last firstFor all of the questions on the following six pages, make sure you clearly explain yourreasoning and show your work. You may use a calculator (you may not program information intoyour calculator) but may not use any other outside materials such as books or notes. If you areunsure of how to interpret any of the questions, please ask me for help. On some of the followingquestions, you have a choice of which parts to answer. Circle the letters of the parts you wantme to mark. Give clear explanations/reasoning for each of your answers. Usediagrams in your answers where appropriate. When you are done, please hand your exam in tome at the front and then either wait quietly in your desk or in the hallway. This exam is scheduledfor 2 hours.Total Grade: /100 (i.e. 50% of the final grade)1. (30 marks in total) For two out of three of the following, answer the questions. Use theback of this page if necessary.a. Which are the major sources of ozone at ground level and in the ozone layer? Where doyou want ozone and why?b. What are halons and what are their uses and environmental effect?c. For the molecule C2H4O, calculate the percent composition for all of the elements,calculate its molecular weight, and draw three structural isomers.22. (10 marks in total) Balance all of the following reactions. Show your reasoning and/oryour work.a. Fe2S3 + P4  Fe3P2 + S8b. C2H2 + Cl2  C2H2Cl4c. NO2 + H2  NH3 + H2Od. C2H4Cl2 + O2  CO2 + H2O + Cl233. (20 marks in total) For four out of five of the following questions, give a short answer inthe space provided. Show your reasoning and/or your work.a. Define the term isotope and give the three important isotopes of hydrogen.b. Explain why sticking you hand in a hot oven for 5 seconds will not burn it but touchingthe oven rack in the same oven for even a fraction of a second will produce a burn.c. Giving your detailed reasoning, predict the effect on global warming of an increase in theamount of rice grown.d. Give a description of how X-ray diffraction works.e. What causes the rank of coal to change over time and how does this affect its chemicalcomposition.44. (20 marks in total) For four out of six of the following compounds, draw their Lewisstructures, name their key functional group, and describe a use for the compound. [Be sure youdraw in each atom and give it the correct number of bonds.]a. Acetoneb. Diethyl Etherc. Acetic Acidd. Ethyl Acetatee. Benzenef. Acetylene.55. (20 marks) For the following molecules give the Lewis electron structure in the spaceprovided. Predict the bond distances and angles around each atoms. Show your reasoning, anyassumptions you make, and/or your work. H H N C O HBr C C C C C C FH HC C C CH HH H HH C C C S