Unformatted text preview: place? A milky white solid formed. 9. Why is it important to know the amount of pollutants, such as mercury, present in water? Mercury poisoning can cause neurological disorders or even death. 10. What is spectroscopy? Determining the concentration of a solution from the intensity of its color 11. What is meant by precision? Is it possible for measurements to be precise but inaccurate? When measurements are close to each other; Yes 12. Why are repeated trials of the same measurement desirable? The average value is usually close to the true value. 13. Pollutants and trace minerals are often reported in units called ppm. What is a ppm? Part per million; 1 gram in 1 million grams of material 14. Measurements may be made directly and indirectly. Give an example of each that you saw in the video. Direct - using a balance; indirect - salinity of bay water or measuring for mercury in water...
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- Fall '10
- Chemistry, Bureau of Standards