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Unformatted text preview: Experiment 7 – Spectroscopy Spring 2009
Name TA Type name Type TA's name List references here (Lab Partners, Lab Manual, Textbook, etc.) Lab Day and Time Section Type day & time Type section number Documentation Possible Points Introduction • Purpose of report • Goals of the experiment Materials and Methods • Reference lab manual • Described procedure for building spectroscope • Described deviations from the procedure Results and Discussion • Inserted titles for tables • Inserted graphs into template • Inserted captions for each graph • Showed complete sample calculations • Summarized all data in tables • Answered questions completely • Error analysis Laboratory Technique 10 Points Received 20 50 20 TOTAL (100) TA Comments/Suggestions: CHEMISTRY 101L REPORT TEMPLATE
Spectroscopy Introduction EXPT. 7 Insert a clear and concise paragraph that states the purpose of the report and the purpose of the experiment. Try to explain what you were trying to do and why it is significant. Materials and Methods Describe the procedure for building the spectroscope. This should be written in past tense using clear paragraph organization following the guidelines for writing experimental procedures. Results and Discussion Describe the major components of the spectroscope and how these components affect the spectrum seen in the spectroscope. Briefly (1-2 sentences) introduce the concept of calibrating an instrument. Describe how calibration is related to this experiment and refer to the data presented in Table 1 and Figure 1. Insert plot of wavelength vs. position Figure 1. Insert caption that describes the graph. Table 1. Insert title for Table 1 Color of Line Equation for Calibration Line Position on Graph Paper Wavelength (nm) Describe the light sources that were analyzed when comparing emission spectra and how the calibration curve was used to determine the spectral range for each light source. Show ONE sample calculation for determining the wavelength range and refer to data in Table 2. Insert sample calculation for determining wavelength using the spectroscope. Table 2. Insert title for Table 2. Light Source Wavelength Range Region(s) of Maximum Intensity Compare and contrast the various light sources. For example, why is candlelight considered "soft" light while fluorescent lights are considered "harsh". Refer to data presented in Table 2 to make similar types of comparisons. Briefly introduce the concept of atomic line spectra. Describe how this concept is related to this experiment to introduce the data displayed in Table 3. Table 3. Insert title for Table 2. Include reference for literature values of the wavelength. Color of Position on Graph Calculated Wavelength Literature Wavelength Line Paper (nm) (nm) Percent Error Answer the following questions in present tense using paragraph organization. How do the calculated wavelength values compare to the literature values? How can you account for any discrepanices? Briefly introduce the concepts of Bohr's Model of the hydrogen atom and the Balmer series. Discuss how these concepts are related to this experiment. Show sample calculations for determining the frequency, energy, and electron transition and refer to data in Table 4. Insert sample calculation of frequency Insert sample calculation of energy Insert sample calculation of electron transition Table 4. Insert title for Table 4. Wavelength Color of Line (nm) Frequency (Hz) Energy (J) Transition Do the experimental values that you determine support Bohr's model of hydrogen? How can you account for any discrepancies? Explain how emission spectra are generated and relate this concept to data presented in Table 5. Add as many additional rows to Table 5 as needed to present all emission spectra data collected for the elements. Table 5. Insert title for Table 5. Element Color of Flame Color of Emission Lines Position Wavelength Explain how emission spectra were used to identify the components in an unknown mixture. Use the data presented in Table 6 to justify your answer. Add as many additional rows to Table 6 as needed to present all emission spectra for the unknown mixture. Table 6. Insert title for Table 6. Color of Flame Color of Emission Lines Position Wavelength Elements in Unknown Mixture Explain how emission spectra could be a valuable tool to scientists. Find and describe a real world example of how emission spectra are used in the scientific community. ...
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- Fall '08