key-eng-08fa-CHM2045C-e8117x01

key-eng-08fa-CHM2045C-e8117x01 - Exam 1 answer key for 16...

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Unformatted text preview: Exam 1 answer key for 16 September 08 The test version is listed before problem 1, after problem 22, and before problem 23. Name, version 2 pts Part I 63 pts Part II 35 pts Total 100 pts PART I : rho is ρ , sigma is σ # Topic % correct ρ-1-R ρ-1-S σ-1-R σ-1-S 1 scientific method 34.5 b e 2 mixture 74.5 e ab 3 SI base unit 70.9 d ad 4 prefix meaning 81.8 ab a 5 prefix meaning 83.6 c e 6 reading a graduated cylinder 67.3 b a 7 reading a length scale 40.0 c d 8 finding an average; sig figs 14.5 e d 9 atomic notation 67.3 e d 10 isotopic abundance and atomic weight 49.1 a d 11 Rutherford’s nuclear model 32.7 a e 12 Dalton’s atomic theory 29.1 ad ad 13 group names 70.9 e a 14 group names 52.7 c ab 15 metallicity 58.2 a ab 16 predicting ion charges 72.7 b e 17 predicting ion charges 83.6 ab a 18 phosphate ion 52.7 c ab 19 molecular/ionic compounds 70.9 d e 20 balancing 96.4 d e 21 type of reaction 96.4 e b 22 type of reaction 78.2 ad ac 23 percent composition 81.8 d a 24 empirical formula 90.9 b b 25 empirical formula 49.1 b e 26 molar mass 92.7 e b 27 simple stoichiometry 72.7 b e 28 percent yield 58.2 e b If you think you spot an error, please let Dr. Eng know. He can be reached at his email address: [email protected] Exam 1 answer key for 16 September 08 The test version is listed before problem 1, after problem 22, and before problem 23. PART II 29. (3 pts) Briefly state the safety agreement concerning the following items: safety glasses/goggles: 1.5 pts Wear safety glasses/goggles with side shields at all times in the laboratory. Alternatively, because quizzes are given in the labs: Wear safety glasses/goggles with side shields when experiments are performed in the laboratory. 1.5 pts footwear: Always wear close-toed shoes in the laboratory. 30. (4 pts) Perform the following two problems using our rules for significant figures. Show each addition, subtraction, multiplication, or division calculation separately. 1 pt adding rule first decimal (3004) 00 . 23 9999998371 . 22 610305273 . 130 037 . 3004 0489 . 2893 377862 037 . 3004 0489 . 2893 377862 10 70 . 3 10 004 . 3 2 3 = = = = × + ×- 6 sig figs (130.610) answer has 4 sig figs 1 pt division rule (½ pt for each division) 1 pt adding rule 1 pt multiplication rule ρ-1-R ρ-1-S 0000 . 4 50000 . 1 0000 . 6 50000 . 1 0549 . 9451 . 5 = = + 0000 . 1 00000 . 6 0000 . 6 00000 . 6 0549 . 9451 . 5 = = + σ-1-R σ-1-S 0000 . 3 00000 . 2 0000 . 6 00000...
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key-eng-08fa-CHM2045C-e8117x01 - Exam 1 answer key for 16...

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