homework1

# homework1 - Version 109 – Homework 1 – Sutcliffe...

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Unformatted text preview: Version 109 – Homework 1 – Sutcliffe – (53980) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. DO NOT ROUND ANY NUMERICAL PROBLEMS. WORK THEM USING 5 OR 6 SIG FIGS AND QUOTE ANSWER TO 4 OR 5 SIG FIGS. SEE HELP LINK ABOVE FOR MORE INFO. 001 10.0 points Which statement would best describe the term “groundwater?” 1. any water pumped from wells that have been drilled into underground aquifers that needs treatment to remove contaminants 2. any water pumped from wells drilled into underground aquifers that is usually free from harmful contaminants correct 3. any water found above ground that is usually free of contaminants 4. any water found above ground that needs treatment to remove contaminants Explanation: 002 10.0 points If a faucet drips one time every five seconds and each drop is 0.050 mL, how many gallons are wasted in four weeks? 1 gal = 3785.4 mL 1. 6.4 gal correct 2. 26. gal 3. 32. gal 4. 0.91 gal Explanation: Using the following information: 1 gallon = 3785.4 mL 1 hr = 3600 s 24 hr = 1 day 7 days = 1 week ? gal = 1 drip 5 s × . 050 mL 1 drip × 1 gal 3785 . 4 mL × 3600 s 1 hr × 24 hr day × 7 days 1 week × 4 weeks = 6 . 4 gal 003 10.0 points Water in parts of the Midwest may be very “hard” and have a calcium ion concentration as high as 400 ppm. What is this calcium ion concentration when expressed as a percent- age? 1. 4% 2. 0.04% correct 3. 0.4% 4. None of these 5. 0.004% 6. 40% Explanation: 400 ppm = 400 1000000 = 0 . 0004 = 0 . 04% 004 10.0 points 62 g of zinc are dissolved in 505000 mL of water. What is the concentration in ppb? Correct answer: 122772 ppb....
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## This note was uploaded on 03/19/2008 for the course CH 305 taught by Professor Sutcliffe during the Spring '08 term at University of Texas.

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homework1 - Version 109 – Homework 1 – Sutcliffe...

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