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Unformatted text preview: Chemistry 131 Preliminary Exam I 2 October 2008 8:00 a.m. to 9:30 a.m. Name: ________________________ ID #: ________________________ Workshop Meeting Time (day/hour and building) ________________________ (2 pts. Extra credit) This exam consists of six (6) questions, one extra credit problem, and a page of potentially useful information. Please check BEFORE you begin to make sure that you have a complete exam. Please do all your work on the pages provided. You may use the backside of pages for additional work, but please tell us that you are doing so (i.e. an arrow with a note in clear English saying "more work on back"). SHOW ALL WORK . GIVE UNITS for all answers that require them. Partial credit can only be given for those answers for which work is provided. CIRCLE YOUR ANSWER. We ask this so that we don't have to interpret what you intended as your final answer. GOOD LUCK! Prob. W.S. 1(30) 2(25) 3(30) 4(20) 5(35) 6(25) E.C.(5) Total 165 Score ROCHESTER U N I V E R S I T Y O F University of Rochester Rochester, New York 14627-0216 COLLEGE OF ARTS AND SCIENCE DEPARTMENT OF CHEMISTRY 1) Note: these problems can be solved with little calculation. Showing work is not required. Consider the following four samples: 1 mol of Lithium Hydride 64.05 g of Ammonium Nitrite 18.02 g of Dihydrogen Monoxide 2.0 mol of Dinitrogen tetroxide a) (5 pts.) Write the molecular formula for the sample that has the most hydrogen atoms. b) (5 pts.) Write the molecular formula for the sample that has the least atoms. c) (5 pts.) Write the molecular formula for the sample that has the most molecules. 1d) Consider the following four solutions: 2.0 L of 1.0 M NaCN 1.0 L of 0.5 M K 2 SO 4 0.5 L of 1.5 M KClO 3 2.0 L of 0.5 M K 2 SO 3 (5 pts.) Write the chemical name in the space below for the sample that has the most total number of ions. (5 pts.) Write the chemical name in the space below for the sample that has the highest concentration of cations....
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- Fall '04