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Exam 1 Key

# Exam 1 Key - 1 2 3 4 5 6 7 ,CHEM50...

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Preparatory Class for General Chemistry, CHEM 50 Instructor: Ram Subramaniam, Exam 1, October 10 2011 1. Which of the following quantities can be measured exactly? (a) length (b) mass (c) volume (d) time (e) none of the above E 2. Which of the following balances has the least uncertainty? (a) analytical balance, ± 0.0001 g (b) triple‐beam balance, ± 0.01 g (c) double‐pan balance, ± 1 g (d) electronic balance, ± 0.001 g (e) platform balance, ± 0.1 g A 3. How many significant digits are in the length measurement 0.0100 meter? 4. How many significant digits are in the time measurement 20,000 seconds? 5. Round off the following measurement to three significant digits: 2252 cm. (a) 225 cm (b) 226 cm (c) 230 cm (d) 2250 cm (e) 2260 cm D 6. Add 7.77 g to 11.666 g and round off the answer. 7. Multiply 5.55 cm times 2 cm and round off the answer.

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(a) 10 cm 2 (b) 10.0 cm 2 (c) 11 cm 2 (d) 11.0 cm 2 (e) 11.1 cm 2 A 8. Divide 2882 centimeters by 14.575 seconds and round off the answer. 9. If a marathon race is 26.2 miles, what is the distance in kilometers? (Given: 1 mile = 1.61 kilometer)
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Exam 1 Key - 1 2 3 4 5 6 7 ,CHEM50...

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