ChemExam1Review - lin(el8462 Sample Exam One Shear(51145...

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lin (el8462) – Sample Exam One – Shear – (51145) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. In all cases, select the answer that BEST answers the question asked. The total points on this exam is 300. Some questions provide fundamental constants in addition to those given here and on the scantron sheet. Watch your units! Shear 52375 c = 3 . 00 × 10 8 m/s h = 6 . 626 × 10 34 J · s m e = 9 . 11 × 10 31 kg N A = 6 . 022 × 10 23 mol 1 λ = h mv Δ E = R Z 2 parenleftbigg 1 n 2 1 - 1 n 2 2 parenrightbigg where R = - 2 . 178 × 10 18 J ψ n ( x ) = parenleftbigg 2 L parenrightbigg 1 2 sin parenleftBig nπx L parenrightBig E n = n 2 h 2 8 mL 2 n = 1 , 2 , 3 , · · · 001 10.0points Which of the following describes a chemical change? 1. wood is carved 2. water is heated from 0 C to 50 C 3. alcohol evaporates 4. gasoline burns in an engine 002 10.0points Ethylene (C 2 H 4 ) burns in oxygen to produce carbon dioxide and water. What is the correct form of the balanced chemical equation that describes this reaction? 1. C 2 H 4 + 3 O 2 2 CO 2 + 2 H 2 O 2. C 2 H 4 + 4 O 2 2 CO + 2 H 2 O 3. 2 C 2 H 4 + O 2 2 CO 2 + H 2 O 4. C 2 H 4 + 2 O 2 2 CO + 2 H 2 O 5. C 2 H 4 + O 2 CO 2 + H 2 O 6. C 2 H 4 + 6 O 2 2 CO 2 + 2 H 2 O 003 10.0points Iron reacts with Cl 2 according to the equation 2 Fe(s) + 3 Cl 2 (g) 2 FeCl 3 (s) . How many moles of Cl 2 is needed to react with 4.4 mol Fe? 1. 3.0 2. 6.6 3. 4.4 4. 3.3 004 10.0points Consider the reaction CaCN 2 + 3 H 2 O CaCO 3 + 2 NH 3 . How much NH 3 is produced if 187 g of CaCO 3 are produced? 1. 3.74 mol 2. 2.13 mol 3. 63.6 mol 4. 36.1 mol 5. 72.3 mol
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lin (el8462) – Sample Exam One – Shear – (51145) 2 6. 1.06 mol 005 10.0points Decreasing wavelength of light goes in the order 1. ultraviolet, infrared, visible 2. infrared, visible, ultraviolet 3. ultraviolet, visible, infrared 4. visible, ultraviolet, infrared 5. infrared, ultraviolet, visible 6. visible, infrared, ultraviolet 006 10.0points Microwave radiation that is used to cook food has more energy per photon than ultraviolet radiation that causes tanning.
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