CHEMISTRY Practice Exam #1
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1 EMISTRY Practice Exam #1 Section 1 - Multiple hoice This section of the exam is multiple choice. hoose the BEST answer from the choices which are given and write the letter for your choice in the space provided. All questions are equally weighted and there is no penalty for guessing. (45 pts) 1. Which of the following statements is FALSE? A. Because inorganic chemistry deals with about 105 elements, there are many more inorganic compounds than organic compounds. B. Inorganic compounds usually contain primarily ionic bonds while organic compounds generally contain covalent bonds.. The melting points of organic compounds are usually lower than those of inorganic compounds D., Inorganic compounds generally decompose at very high temperatures. 2. In forming compounds, carbon almost always A. forms four covalent bonds. B. loses four electrons to form a 4+ ion.. gains four electrons to form a 4- ion. D. gains two electrons to form a 2- ion. 3. Describe the relationship between the following two compounds. 2 O and O A. The formulas represent the same compound. B. The formulas represent constitutional isomers.. The formulas represent geometric isomers. D. The formulas represent unrelated compounds.
2 4. Describe the relationship between the following two compounds. and A. The formulas represent the same compound. B. The formulas represent constitutional isomers.. The formulas represent geometric isomers. D. The formulas represent unrelated compounds. 5. Describe the relationship between the following two compounds. and A. The formulas represent the same compound. B. The formulas represent constitutional isomers. The formulas represent geometric isomers. D. The formulas represent unrelated compounds. 6. Which of the following ARE NOT hydrocarbons? A. ketones B. alkanes. alkynes D. alkenes 7. Which of the following has the LOWEST melting point? A. l 4 B. Nal. pentane D Which of the following has the IGEST boiling point? A B.. 2 D. 2
3 9. Alkanes usually have low boiling points because A. they are very polar molecules. B. they are extremely stable like the inert gases.. they have weak secondary forces compared to other organic compounds. D. when heated they tend to solidify. 10. Which is the correct molecular formula for an linear alkane? A. 4 9 B D The hybridization of the carbon atoms in cyclohexane is A. sp 4 B. sp 3. sp 2 D. sp 12. What are the bond angles in a normal alkane? A. 180 o B. 120 o o D. 90 o 13. What are the bond angles around the triple bonded carbon in a normal alkyne? A. 180 o B. 120 o o D. 90 o 14. ow many constitutional isomers exist with the formula 4 10? A. 2 B D A student incorrectly named a molecule 1,2-diethyl propane. What is correct IUPA name for this compound? A. 2-ethyl pentane B. 3-methyl hexane. 3-ethyl-1-methyl butane D. 2,3-diethyl propane
4 Section 2 - Isomerism!!!!!!!!! (18 pts) 16. Draw structural formulas* for any two different structural isomers with the molecular formula others 17. Draw structural formulas* for any two different isomers with the molecular formula others 18. Draw structural formulas* for any two different isomers with the molecular formula 3 8 O. O O *Your structural formulas may be condensed, but they must contain enough information to represent the structure unambiguously.
5 Section 3 - Nomenclature - Give correct systematic names for the following compounds!!!!!!!! (20 pts) ethyl-2,3-dimethylhexane!!!!!!! 20. 3,4-dichlorohexane!! l!! l!!! Br!!!!!!! Br 3 2,5-dibromo-4-isopropyl-3,6-dimethylheptane 22.!!!! 2! 2 trans-1-methyl-2-propyl cyclopentane!!
6 Section 4 - General Questions on ydrocarbons!!!! (12 pts) 23. onsider the following three compounds: A B Give a molecular formula for each compound A. B.. lassify each compound as saturated or unsaturated. unsaturated saturated unsaturated A. B.. lassify each compound as aliphatic or aromatic. aliphatic aliphatic aromatic A. B.. Section 5 - hemical Reactions of ydrocarbons!!!! (5 pts) 24. omplete and Balance the Equation for the combustion of heptane: O2 14 2O O > +
7 Bonus Question - For the following reaction, give a structural formula for the major product of the substitution reaction (molecular is formula given). (up to 5 pts) 3 Br 2 uv light 3 Br!!!!!!!!!!!!!!!!!!!!!!! 6 13 Br
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