120sample_exam_sample_questions_key

120sample_exam_sample_questions_key - Answers to sample...

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Unformatted text preview: Answers to sample questions for Chem 120 final exam. 1. Fill in the blanks. 4.3 x 10'6 109 hotter 239 °F . density boron 38 two cesium perchlorate H2804 atoms 2. Calculate the answers to the following questions: 1.88 x 102 J 61 2 e' 0.4999 mole 20.4 g 35.00% 3. Balance the following two chemical equations: 4NH3(g) + 502C?) —’4N0(g) + 6H20 (8) B203 (s) + 3CaF2(s) —>2BF3 (g) +3 CaO (s) 4. 2AgN03 (aq) + NiClz (aq) a 2AgCl(s) + Ni(NO3)2 5. (i) 2F e (s) + 38 (s) —> Fe2S3 (s) (ii) Fe is oxidized, sulfur is reduced. 6. (i) 0.5 mol Clz/l mole NaClOz (ii) 9.80 g (iii) 16.2 g 7.c. 4 8. d. milli 9. d. 25.68 10. d. 14.8 11. liquid 12. liquid 13. c. a compound 14. a. Be 15. b. 10 Mng 17. isotopes 18. a. chemical property 19. a. 1.767 x 10‘4 b. 2.38 x 105 c. 9.301 x 103 d. 1 x 101 20. a. chemical b. chemical 0. physical (1. physical 21. No. Volume of gas in balloon expanded with increasing temperature. 22. Plotting degrees Celsius VS degrees Fahrenheit gives a non-zero intercept and a slope not equal to one — thus two-step conversions required. . 23. 0.561097 kilometers. 24. 8.01 cm3. 25. 50.0 g 26. a. potassium perchlorate b. CF4 c. zinc chloride (1. dinitro gen tetrasluoride e. nitrous acid f. CU(HCO3)2 27. a. acid-base b. oxidation-reduction, single displacement c. oxidation-reduction, combination (1. combustion, oxidation-reduction e. oxidation—reduction, decomposition f. precipitation, double displacement 28. 38.76% Ca, 19.97% P, 41.27% 0 29. HgO 30. €6le 3 1. b. quantized 32. c. 5 33. 5 34. ls22322p4 1522s22p63s23p6 35. d. 3p 36. e. O 37. Si. Smaller positive charge in nucleus of Si than in nucleus of S. Thus, the attraction between the nucleus and the electrons is weaker in Si than in S and the electrons which means the electrons in Si are more likely to be found further from the nucleus than the electrons in S. 38. polar covalent bond 39. c. Si——O ' 40. d. Ca2+ 41. Draw the Lewis structure for the following: a_ .' Ci: ii iii H: b- It: 5;:14 ii 0- u: a 2-0: 1.1 42. a. tetrahedral, bent b. tetrahedral, tetrahedral c. linear, linear d. tetrahedral, bent 43. polar: SClz, OClz ...
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