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Unformatted text preview: Selected Answers to Review Problems for Quiz 2 09-103 Fall 2006 I. For the following statements, circle T if the statement is TRUE and F is the statement is FALSE. T F 1. Chlorine atoms form 1+ ions. T F 2. The compound CH 4 forms as a result of transferring electrons from the hydrogen atom to the carbon. T F 3. Fe 2 O 3 is an insoluble compound, which helps to explain why we can obtain large amounts of iron from the Earth’s surface and not the sea. T F 4. The Maximum Contaminant Level Goal (MCLG) is the legal limit the concentra- tion of a contaminant in water must exceed for health problems to exist. T F 5. Ozone is effective at disinfecting water, but it does not protect water after it leaves a treatment facility because it decomposes quickly. T F 6. Trihalomethanes are the toxic byproducts from the chlorination of water, and CH 2 Cl 2 is an example of one. T F 7. In an ion exchange column used to soften water, one Fe 3+ ion would exchange with two Na + ions. T F 8. The trace Pb 2+ salts in water can be directly analyzed by visible spectrophotometry. T F 9. Gas chromatography is most useful for detecting substances in water that evaporate easily. T F 10. Bottled water has not been disinfected by chlorination. T F 11. There is a large amount of water, mainly in aquifers, available on the Earth that is safe for drinking T F 12. An aqueous solution that is 6 ppb in lead has 6 mg of lead per liter of water. T F 13. The compound PH 3 can hydrogen bond with NH 3. II. Circle the letter of the correct answer for the following multiple choice questions. 1. Which statement concerning groundwater is correct? A. Any water found above ground that needs treatment to remove contaminants. B. Any water found above ground that is usually free of contaminants. C. Any water pumped from wells that have been drilled into underground aquifers that needs treatment to remove contaminants. D. Any water pumped from wells drilled into underground aquifers that is usually free from harmful contaminants. Selected Answers to Review Problems for Quiz 2 09-103 Fall 2006 2. A 4-L sample of water contains 80 μ g of lead. What is this lead concentration, in ppb? A. 20 B. 80 C. 320 D. 500 3. What is the molarity of sodium chloride in a solution containing 0.50 mol of sodium chloride in 500 mL of water? A. 0.25 M B. 0.50 M C. 1.0 M D. 5.0 M 4.. Which of the following is true about solubility? (a) It increases with temperature....
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