Unit 1 HW #1-solutions.pdf

# Unit 1 HW #1-solutions.pdf - mendoza(cm56967 Unit 1 HW#1...

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mendoza (cm56967) – Unit 1 HW #1 – schneider – (4184) 1 This print-out should have 40 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points What is the proper solution to the following equation? (150 + 2 . 5 + 36 . 75) ÷ (6 . 60 + 0 . 173) = 1. 28 correct 2. 30 3. 27.94183 4. 27.94 5. 27.9 6. 27.942 7. 27.9418 Explanation: The rule of addition gives 2 sig figs on the top and 3 sig figs on bottom (you can only be as precise as the least precise number). Then, by the rule of division (your answer cannot have more sig figs than the least number of sig figs used in your calculation), the final answer 27.94 needs to be rounded to 2 sig figs: 28. 002 10.0points What is the length of the line segment in- dicated on the scale provided using proper significant figures? 0 1 2 3 1. 3.000 units 2. 3.00 units correct 3. 3.0 units 4. 3 units Explanation: The scale is in units of tenths, so hundreths is the uncertain digit. 003 10.0points What is the proper measurement of the vol- ume represented? 1 2 3 4 5 mL 1. 2.500 mL 2. 2.50 mL 3. 2.5 mL correct 4. 2.0 mL Explanation: The scale is in units of 1, so tenths is the uncertain digit. 004 10.0points A pipe drips at 155 mL/min. Express this is units of gallons/day. 1. 377 gal/day 2. 942 gal/day 3. 2.34 gal/day 4. 0.223 gal/day 5. 223 gal/day 6. 58.9 gal/day correct 7. 15.7 gal/day Explanation:

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mendoza (cm56967) – Unit 1 HW #1 – schneider – (4184) 2 ? gal day = 155 mL min × 1 L 1000 mL × 1 gal 3 . 785 L × 60 min 1 hr × 24 hr 1 day = 58 . 9 gal day 005 10.0points For the conversion of 0.0003140 kilograms to ounces, the conversion factors are 10 3 grams per kilogram, 1 pound per 453.6 grams and 16 ounces per pound. The correctly expressed answer is 1. 1 . 108 × 10 2 oz 2. 1 . 108 × 10 5 oz 3. 1 . 108 × 10 2 oz correct 4. 4 . 329 × 10 5 oz 5. 8 . 902 × 10 1 oz Explanation: ? ounces = 0 . 0003140 kg × 1000 g kg × 1 pound 453 . 58 g × 16 ounces 1 pound = 1 . 108 × 10 2 ounces Zeroes at the end of numbers containing a dec- imal point are considered to be significant, so 0.0003140 has 4 significant figures. The 1 kg to 1000 g and 1 pound to 16 ounces conver- sions are exact definitions, so these numbers do not affect how many significant figures the answer should have. 006 10.0points Keeping in mind the rules for significant dig- its, calculate the sum of 5.622 g and 0.3178 g. 1. 5.940 g correct 2. 5.94 g 3. 5.93980 g 4. 5.9398 g 5. 5.9 g 6. 6 g Explanation: sum of given values = ? 5 . 622 g + 0 . 3178 g = 5 . 940 g 007 10.0points Which is the LEAST precise of these devices for measuring liquid volumes? 1. buret 2. beaker correct 3. graduated cylinder 4. pipet Explanation: A beaker is the least precise device to mea- sure liquid volumes. 008 10.0points What is the formula of ammonium nitrate? 1. NH 4 NO 3 correct 2. NH 4 N 3. NH 4 (NO 3 ) 2 4. (NH 4 ) 2 NO 3 Explanation: The ammonium ion is NH + 4 ; the nitrate ion is NO 3 . One NO 3 is needed to balance the charge on each NH + 4 , so the formula for ammonium nitrate is NH 4 NO 3 .
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