# answers_exam_1_sp99 - Chem 2 Spring 1999 Dr Harrison EXAM#1...

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Chem 2, Spring 1999 EXAM #1 Name_________________ Dr. Harrison 1. (8 pts) Complete the following operations keeping in mind significant figures. Express answers in the proper scientific notation form where appropriate. a. 01.0 cm/ 5.00 cm = 0.20 cm b. 1100 cm - 250.00 cm = 900 cm c. 1.022 x 10 -3 / 2.7 = 3.8 x 10 -4 d. 8720.0 + 10.778 = 8730.8 2. (4 pts) How many significant figures are in each of the following numbers? a. 8.720 x 10 -2 m ___ 4 __________ b. 0.00112 m ___ 3 ____ c. 062.10 cm ______ 4 ________ d. 99.009 dm ____ 5 ____ 3. (8 pts) Convert the following to 3 significant figures. Express answers in the proper scientific notation form where appropriate. a. 25,070,010 2.51 x 10 7 b. 0.002341 x 10 6 2.34 x 10 3 c. 0.1001 _ 1.51 x 10 7 d. 4882 x 10 -3 4.88 4. (8 pts) Complete the following metric conversions (use scientific notation where appropriate). a. 8.443 x 10 6 dL to kL 8.443 x 10 2 Kl b .0726 Mg to hg 7.26 x 10 2 hg c. 230. mm to dam 2.30 x 10 -2 dam d. 2.200 mL to hL 2.200 x 10 -5 hl

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5. (8 pts) Convert 19 ft 2 to cm 2 . Express your answer in scientific notation. 1 inch = 2.54 cm 12 inches = 1 foot 1.8 x 10 4 cm 2 6. (6 pts) Put a number ( 1,2 or 3) by each of the following temperatures to designate the hottest (number 1) and the coldest (number 3).
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