115 Final Exam Spring 2005

115 Final Exam Spring 2005 - Name_CRIB Section Social...

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Name _____CRIB___________________ Chemistry 115 Section ____________ FINAL EXAM Total Points = 250 Social Security # ___________________ Thursday, 1:00 PM Instructor ________________________ May 5, 2005 Directions : 1. Each student is responsible for following directions. Read this page carefully. 2. Write your name and other requested information on this page and on the separate answer sheet. 3. CODE your name on the answer sheet using an ordinary (#2) pencil. 4. CODE your correct nine-digit identification number ( Social Security ) on the answer sheet. THIS IS VERY IMPORTANT! 5. CODE your section number on the answer sheet. Please use all four digits, 0101, 0102, 0201, or 0202. This is also very important! 6. Put all calculations on the examination pages. DO NOT PUT ANY EXTRA MARKS ON THE COMPUTER ANSWER SHEET! 7. This exam consists of 37 multiple-choice questions worth 6.757 points each. Choose the one best or correct answer for each question and write it both on your exam paper and on the computer answer sheet. The computer answer sheet is the only one that will be graded! 8. This exam consists of 11 pages plus a Periodic Table and two sheets of scratch paper. Please check to be sure that you have them all! END OF EXAM 1) Please make sure that you have entered 37 answers on your scan sheet. 2) Make sure that you have entered your name, ID number (9 digit SID # or SSN #, but not your 10 digit PUID #) and lab section number (4 digits). 3) You MUST turn the scan sheet in to your TA before leaving the exam!
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Chem 115 ! Final Exam ! 5/5/05 2 _B___ 1. Choose the process that best represents a chemical change: (a) Frost disappears from the lawn by noon. (b) An automobile rusts (c) Spilled oil forms a film on water (d) Helium escapes by passing through the latex wall of a balloon (e) After long heating, sugar water forms syrup _D___ 2. Choose the property that is intensive: (a) number of particles (b) volume (c) mass (d) temperature (e) length _E___ 3. A substance is observed to be a uniform (homogeneous) solid. Upon heating in an inert atmosphere to a temperature of 3500 K and then cooling, the sample is found to be unchanged. Choose the most likely composition of this sample. 4. J. J. Thomson used magnetic and electric fields to determine a value 10 – 3 times less than that of hydrogen for the ratio of mass to charge of the particles produced in a cathode ray tube. Reasoning according to the Scientific Method, one can conclude that: (a) Dalton's theory says that atoms are the smallest units of matter. Since hydrogen is the lightest atom, the measurement made by J.J. Thomson must be wrong. (b) The measurement is accurate but presents no problems for Dalton's model. A theoretical model need not predict every observation to be correct. (c) A new model is needed to account for the existence of elementary particles smaller than atoms.
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