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

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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:
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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 .
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern