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120-Exam-1-Sp17-Key.docx

120-Exam-1-Sp17-Key.docx - Grossmont College Chemistry 120...

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Grossmont College Chemistry 120 Exam 1 Spring 2017 Name: ___________________________________Date: ________ Instructor: Diana Vance Exam 1 Part 1: Multiple Choice (2 points each) Directions: Please circle the best answer for each of the following questions. 1. Which element is not a representative element? a. Aluminum b. Sulfur c. Potassium d. Boron e. Iron 2. Which of the following numbers are correctly expressed in scientific notation? i. 43,200,000 = 4.32×10 7 ii. 0.000977 = 9.77×10 4 iii. 606,000 = 6.06×10 –5 iv. 0.00000175 = 1.75 × 10 –6 Page 1 of 6
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a. i and iv b. ii and iii c. i and iii d. ii and iv e. All of the above 3. What is the measurement shown by the calipers? a. 0 mm b. 0.8 cm c. 10.5 cm d. 19.8 cm e. 26.8 cm 4. Convert 32.7 m to mm. a. 32,700 mm b. 0.0327 mm c. 327 mm d. 0.0327 mm e. 0.327 mm 5. Consider a situation in which you are walking at 3.7 miles per hour. Which of the following per expression is true? a. 3.7 mi = 1 hr b. 3.7 mi 1 hr c. 1 hr 3.7 mi d. Distance in miles is directly proportional to time in hours. e. all of the above 6. Which of the following most accurately describes the change represented: a. A physical change which follows the law of conservation of mass. b. A physical change which does not follow the law of conservation of mass. c. A chemical change which follows the law of conservation of mass. d. A chemical change which does not follow the law of conservation of mass. e. none of the above 7. The meter stick in the image is being used to measure the length of a piece of wood. How many significant figures should be used to express this measured length?
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a. 1 b. 2 c. 3 d. 4 e. 5 8. Isotopes of an element vary in mass because of differing numbers of a. protons b. neutrons c. electrons d. protons and neutrons e. protons and electrons 9. Which statement is consistent with Rutherford’s nuclear model of the atom as it was originally stated?
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