CHM135 Lab 1 report sheet 4

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University of Toronto *

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Course

135

Subject

Chemistry

Date

Apr 3, 2024

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docx

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4

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Experiment 1: Light, Matter and Measurements Report Sheet You are welcome to seek guidance on the content of this lab report from your TA during your lab session and from the CHM135 lab coordinator during lab office hours. You are also welcome to work constructively with your peers on the general content and understanding of the material. However, the work submitted here in this report sheet must be your own. For more details on academic integrity and potential penalties see the Code of Behaviour on Academic Matters . I certify that this submitted laboratory report represents entirely my own efforts. I have read and understand the University of Toronto policies regarding, and sanctions for, academic honesty. I regret that I violated the Code of Behaviour on this assessment and would like to admit that now so that I can take responsibility for my mistake. 1. What colours did you observe for each of the following salts? NaCl SrCl 2 KCl CuCl 2 2. What did you observe on the black paper on the other side of the cuvette when you passed the green laser beam through the concentrated solutions of green and red solutions? Explain your observations in one sentence. Observation Green solution Red solution 3. How did changing the concentration of the two dye solutions affect the amount of green laser light that was able to pass through the solution? What was the effect of adding move cuvettes in series? Explain your observations on the molecular level in one sentence. a. Green solution b. Red solution
4. In lab, you observed atomic emission and molecular fluorescence, both of which involve photon emission. Compare these two processes – 1. How were the atoms/molecules excited in each case? 2. How did the energy of the emitted photon compare to the energy of the excitation process in each case? Why? Fluorescence:
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