Chem 4A-Fall 2007-Midterm 1

Chem 4A-Fall 2007-Midterm 1 - Name _KEY_ Chemistry 4A...

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Chemistry 4A Name _____ KEY _____________________ Midterm Exam I September 28, 2007 GSI ________________________________ Part I: Multiple Choice Chapter 1: (4) Chapter 2: (4) Chapter 3: (8) Chapter 12: (16) Chapter 13: (12) Chapter 23: (6) Chapter 21: (6) TOTAL (56) Part II: Lab Questions 1. (8) 2. (10) TOTAL (18) TOTAL EXAM SCORE (74) _______________________ Important: You can use the textbook for any information you need, especially Appendix D, physical constants, conversion factors, and the periodic table Time: 50 minutes There are many easy and quick problems. Do the easy and quick ones and the lab questions (at the last parts of the exam) first, then go to those that take more time to answer. No word processing calculators Only answers written in the appropriate boxes will be given credit. Partial credit will be given for work shown Part II, but NOT for Part I
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Chemistry 4A Fall 07 Midterm 1 Name: ________________________________ Part I: Multiple Choice (2 points each) Chapter 1 1. In Millikan’s oil drop experiment, he was able to determine the charge of the electron because a) each oil drop had only one electron. b) each oil drop contained an integer number of electrons. c) each oil drop had an identical charge. d) the oil drops were too small to be affected by gravity. e) the oil drops all fell at a constant speed. b Answer: 2. In Rutherford’s experiment scattering α particles off gold foil he a) observed that a small fraction of the α particles were negatively charged. b) observed that most of the α particles pass straight through the foil. c) observed that a small fraction of the α particles scattered backwards from the foil. d) both b & c e) all of the above d Answer: Chapter 2 3. You have a compound that contains only carbon and hydrogen. If you burn the compound at high temperature in the presence of oxygen it is completely converted to CO 2 and H 2 O. When you react 20.0 g of your sample you generate 62.7 g of CO 2 and 25.7 g of H 2 O. Which of the following is a possible formula for your compound? a) C 2 H 2 b) C 2 H 4 c) C 2 H 6 d) C 3 H 5 e) C 3 H 7 b Answer: Page 2 of 11
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Chemistry 4A Fall 07 Midterm 1 Name: ________________________________ 4. In fermentation, sucrose, C 12 H 22 O 11 , reacts with water to form ethanol, C 2 H 5 OH, and carbon dioxide. A balanced chemical equation for this reaction is a) C 12 H 22 O 11 ( aq ) + 3 H 2 O ( l ) 5 C 2 H 5 OH ( aq ) + 2 CO 2 ( g ) b) C H 22 O 11 ( aq ) + 7 H 2 O ( l ) 2 C 2 H 5 OH ( aq ) + 8 CO 2 ( g ) 12 c) C 12 H 22 O 11 ( aq ) + 2 H 2 O ( l ) 6 C 2 H 5 OH ( aq ) + CO 2 ( g ) d) C 12 H 22 O 11 ( aq ) + 2 H 2 O ( l ) 4 C
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Chem 4A-Fall 2007-Midterm 1 - Name _KEY_ Chemistry 4A...

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