142A_Exam1B_key_071511

142A_Exam1B_key_071511 - Chem 142 VERSION B Summer 2011...

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Chem 142 VERSION B Summer 2011 EXAM 1 VERSION B Page 1 of 10 CHEM 142 - Exam 1 Version B !!! DO NOT OPEN THIS EXAM BOOK UNTIL TOLD TO DO SO BY THE INSTRUCTOR !!! Instructor: Dr. Kari Pederson NO GRAPHING CALCULATORS ALLOWED Date: Friday, July 15 ONLY CALCULATORS MAY BE USED AS CALCULATORS (you may not use your cellular phone as a calculator) Time: 9:40-10:40am NO HEADPHONES ALLOWED (EARPLUGS ARE OK) Location: BAG 154 NO HATS WITH BRIMS ALLOWED !!! PLEASE READ THIS !!! Indicate all of the following on your scantron form or five points will be deducted from your exam score: First Name, Last Name, Student Number, Section, Exam Version YOUR FULL NAME: _______________________ ________________________ first name last name YOUR SECTION/SEAT: ________________________ ________________________ discussion section seat number
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Chem 142 VERSION B Summer 2011 EXAM 1 VERSION B Page 2 of 10 Question Points Possible Score 1-8 24 9-16 40 17-20 16 21 20 Scantron Info? -5 TOTAL 100
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Chem 142 VERSION B Summer 2011 EXAM 1 VERSION B Page 3 of 10 MULTIPLE CHOICE: CONCEPTS. 8 @ 3 pts each 24 POINTS TOTAL Please mark the one correct answer for each of the following questions on your scantron. 1. Which of the following is a physical property of the element chlorine? A) Chlorine is a gas that is poisonous if inhaled . B) Chlorine will react with sodium to make salt. C) Chlorine is a gas that will become a liquid at –34.4 ºC. D) Chlorine is used in water treatment as a disinfectant. E) Chlorine exists as a diatomic molecule. 2. Which metric prefix symbol means 1 x 10 -3 ? A) p B) m C) M D) k E) n 3. As chemists and other scientists seek to understand the principles that govern nature they employ what is called the scientific method. The first step in this method is ____. A) the proposal of a hypothesis B) the testing of a scientific law C) the making of observations D) the application for a research grant E) the testing of a hypothesis 4. Reaction of 10.0 grams of calcium with _________________ of sulfur gave 22.0 grams of calcium sulfide. All the calcium was used, but there were 20.0 grams of sulfur left over. A) 12.0 grams B) 22.0 grams C) 32.0 grams D) 42.0 grams E) none of the above Conservation of Mass: total mass reactants = total mass products mass sulfur = 22.0 g calcium sulfide + 20.0 g excess sulfur ( ) ! 10.0 g calcium = 32.0 g 5. Of the following, only _______________ would not be classified as a pure substance . A) sucrose B) acetic acid C) oxygen D) a granite rock E) water
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Chem 142 VERSION B Summer 2011 EXAM 1 VERSION B Page 4 of 10 6. Which statement best describes isotopes? A)
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142A_Exam1B_key_071511 - Chem 142 VERSION B Summer 2011...

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