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10EC26ChoiceIIPrePostQuestions

10EC26ChoiceIIPrePostQuestions - Experiment 26 Choice 2 An...

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Experiment 26: Choice 2: An Equilibrium Constant Pre-laboratory Questions: Show calculations where applicable for credit. (use these and not the ones in the Experimental Chemistry Lab Manual) 1. The many colors of autumn leaves, the shades of colors in fingernail polishes and facial makeup, and the colors of paints and dyes…all colors appear in the visible part of the electromagnetic spectrum. Explain the mechanism by which molecules for each of these examples produce the unique colors that our eyes detect. 2. The white light from a lamp of a spectrophotometer passes through a slit and focusing lens before reflecting off a diffraction grating. The diffraction grating acts much like a prism, separating the white light into a rainbow of colors. In this experiment, the wavelength control of the spectrophotometer is set to maximize the absorption of 447-nm EM radiation for FeNCS 2+ in the sample cell. a. What is the color of 447-nm EM radiation? b. What is the color of the FeNCS 2+ sample in the experiment? c. Why do the colors not agree? 3. When white light is passed through a colored solution, EM radiation is absorbed and EM radiation is transmitted.
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