You have been asked to determine which heavy metals, if any are in a sample of sewage sludge. Why is atomic absorption spectroscopy not a good technique for the job and why is ICP- atomic emission spectroscopy a better choice?

Here is an energy level diagram that illustrates the absorption process. Energy ES (n=5) E4 (n=4) E3 (n=3) E2 (n=2) E1 (n=1)

What is the definition of spectrophotometry? A. Spectrophotometry is the study of interaction of matter with electromagnetic waves (the whole spectra) b. Spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength

3. Consider the following for ¹H8¹Br: Two overlapping bands with lines 16.92 cm-¹ apart, one strong band centered at 2559 cm³¹ and another at 2468 cm¹ that increases in intensity when temperature is raised. Calculate re, K, and De for ¹H8¹Br. Given: mass of 8¹Br = 80.9163 amu, mass of ¹H = 1.007825 amu

152 A 352.44 Your Answer: 155 T 362.31 Answer 153 units Gö G D 355.67 156 X 154 365.88 359.12 157 You time travel 100 years into the future and learn that several new elements have been discovered, as pictured. These elements are frequently found as oxides, and need to be separated in order to extract the pure element. Before going through this effort, it is useful to know what amount of the element can be extracted. How many moles of element A can be extracted from 175 grams of A5012? N 369.52

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Why would a chemist using a spectrophotometer need to perform both a scan across all wavelengths and a scan at a specific wavelength?

Part A1: Do you notice any pattern in the color of the light used to detect absorbance (preset) and the color of the solution? If so, describe the pattern. What happened to the transmittance when the wavelength being detected was changed to approximately the same color as the solution? Try to come up with an explanation for this. How does the percent transmittance of the preset wavelength compare to the percent transmittance when looking at the transmittance over the entire visible spectrum? What happened to the transmittance when the width of the sample was changed? Explain why this makes sense. Explain why there was an upper maximum on the concentrations for each solution. What would happen to the absorbance or percent transmittance of a sample above that concentration? If you needed to measure the exact concentration of a solution whose concentration is above that limit, is there anything you can do?

How many photons are produced in a laser pulse of 0.801 J at 547 nm? photons: