142A_Exam1A_key_071511 - Chem 142 VERSION A Summer 2011...

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Chem 142 VERSION A Summer 2011 EXAM 1 VERSION A Page 1 of 10 CHEM 142 - Exam 1 Version A !!! 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 A Summer 2011 EXAM 1 VERSION A 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 A Summer 2011 EXAM 1 VERSION A 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 chemical property of the element cesium? A) Cesium will react explosively if placed in water. B) Cesium is a soft metal that can be cut easily. C) Cesium, like other metals, conducts electricity. D) Cesium has a much smaller density than lead. E) Cesium is grayish in color. 2. Which metric prefix symbol means 1 x 10 3 ? 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 ____. 4. Sodium metal reacts vigorously with water, releasing hydrogen gas as one of the products. A piece of sodium weighing 34.0 g was added to a beaker containing 76.0 g of water. The resulting solution weighed 98.0 g. How many grams of hydrogen gas were produced (assume no hydrogen gas remains in solution)? Conservation of Mass: total mass reactants = total mass products mass H 2 = 34.0 g Na + 76.0 g water ( ) ! 98.0 g solution = 12.0 g
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