Exam 1 Key - Chemistry 201X: Hour Exam I September 14, 2007...

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Chemistry 201X: Hour Exam I September 14, 2007 Name: _______KEY________________________ GRADING Page 1 26 points _________________ Page 2 16 points _________________ Page 3 20 points _________________ Page 4 22 points _________________ Page 5 16 points _________________ TOTAL 100 points _________________ Rules for the Exam: (1) Show work for the problems (pages 2-5). No credit will be given, even when an answer is written, if no work is shown. (2) Work independently. (3) You may tear off the last page and use it for information and additional scrap paper. Regrading Policy: We make every effort to grade exams thoroughly and accurately. However, when you receive your graded exam and you feel that there are grading errors in your exam, then the following rules apply: (1) You may return the exam for regrading only by the end of the class period in which it is returned to you. Once you leave the classroom with your exam, we will no longer accept it. (2) Write your concern(s) legibly and thoroughly on the front page of the test booklet – indicate clearly what you want to be re-evaluated. (3) We reserve the right to re-evaluate the entire exam when submitted.
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1 Points _________ PART I. (26 Points) Short Answer Questions (Circle your choices or fill in blanks) (1) (3 pts) Accuracy is a measure of how closely a given measurement agrees with (a) the true quantity of the property. (b) another measurement of the same property. (a) (3 pts) One significant result of Rutherford’s experiment was (a) the charge-to-mass ratio of the electron. (b) the mass of the electron. (c) the nuclear structure of the atom. (3) (3 pts) In electron microscopes , the incident electrons used to produce an image have energies on the order of (a) millivolts. (b) volts. (c) kilovolts. (d) megavolts. (4) (3 pts) One factor that influences the brightness of a backscattered electron image from SEM is (a) the total mass of the sample. (b) atomic numbers of atoms in sample. (c) the thickness of the sample.
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This homework help was uploaded on 03/27/2008 for the course CHEM 201 taught by Professor Miller during the Fall '07 term at Iowa State.

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Exam 1 Key - Chemistry 201X: Hour Exam I September 14, 2007...

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