Atomic Spectra Lab report

pdf

School

Marquette University *

*We aren’t endorsed by this school

Course

1001

Subject

Chemistry

Date

Feb 20, 2024

Type

pdf

Pages

Uploaded by CommodoreFangAlbatross43

CHEM 1001 Atomic Spectra Laboratory Report NAME : Liam Cedeno Agosto DATE : 2/15 SECTION : 403 TA : Audrey Vice A. Goals/Purpose of Experiment ( 2 Points, ~50 words ) : The goal of this experiment was to be able to understand atomic energy levels and relate change in wavelengths or absorbed omitted protons to the understanding of quantum numbers. As well as analyze and understand the spectra of different elements using qualitative and quantitative tools. B. Theory/Introduction ( 6 Points, ~100 words ) : everyday examples of something called emission- which is when elements release different colored photons and emit light as a result of being excited- are fireworks and neon signs. These lights consist of many colors, even if to our naked eye there only seems to be one or two. We can see at a microscopic level these different colored lines, or spectra of different elements through tools like a spectroscope, or just try to see one or two of the colors with our naked eye. C. Procedure summary ( 5 Points, ~100 words ) : there were three parts to this experiment. Part one consisted of mostly calculations. We were given three equations with constants that we were to use to find energy in joules using quantum numbers, delta E of transmission and wavelength using upper and lower quantum numbers, then compare our calculated wavelengths to the ones in the emission spectra. For part two we had to use a spectrum tube carousel or spectroscope to determine the number of lines and its colors of different gasses. And for part three we were so watch different metals react with fire and annotate the color or length of the flame D. Results and Calculations: ( 12 Points ) : My results for part one were closely accurate, my calculated wavelengths were all a few decimals or around two integers off from the experimented wavelengths. For part two I was somewhat able to see some of the colored

lines, but possibly weren ’ t fully accurate. And part three was solely based on observation of the naked eye, so those were accurate as well. Part 1: Spectrum of the hydrogen atom Use the figure below to fill Table 1 and Table 2 below Table 1 : title Quantum Number (n) Calculated energy in J (Use Eq 1 of the handout) A 1 -2.18 x 10^-18 B 2 -5.45 x 10^-19 C 3 -2.42 x 10^-19 D 4 -1.36 x 10^-19 E 5 -8.72 x 10^-20 F 6 -6.05 x 10^-2- Table 2 : title

Transition ΔE of Transition (Use Eq 2 of the handout or calculate the difference between two energy levels in Table 1 above) Calculated Wavelength in nm (Use Eq 3 of handout and convert the wavelength in nm) Closest observed experimental wavelength (Figure 3 handout) n upper (Table 1 template) n lower (Table 1 template) K -3. 027 X 10^-19 J 659.92 nm 659.62 nm 3 2 L -4.087 X 10^-19 J 485.87 nm 485.07 nm 4 2 M -4.578 X 10^-19 J 433.8 nm 435.12 nm 5 2 N -4.844 x 10^-19 J 409.95 nm 411.38 nm 6 2 Demonstrate calculations for any one energy and wavelength observed in Part 1: Part 2: Line spectrum of various gases Observe lines and colors produced by various elements, using a handheld spectroscope. Table Title: Gas Number of lines Write ‘m’ if more than 8 lines are present Color of observed lines (Broadly indicate the color bands if more than 8 lines are present) Neon 5 Orange, green, purple, yellow, blue Hydrogen 4 Orange, purple, yellow, blue Helium 4 green, purple, yellow, blue Argon 5 Orange, green, purple, yellow, blue Part 3: Flame test of metal ion solutions Observe the color of a metal ion solution ignited by a Bunsen burner.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Table Title: Metal ion Solution Observed Color Other Observations (if any) Lithium, Li + Magenta red Flame last long Sodium, Na + Bright orange Long flame Potassium, K + Peach Short flame Calcium, Ca 2+ Redish-orange Made sparks Strontium, Sr 2+ Bright red Longer flame, burns orange Cesium, Cs + Lavender Short flame E. Discussion ( 10 Points ) : Please write your answers underneath each question. 1. Briefly explain the process responsible for the appearance of four lines in the hydrogen emission spectrum. (2 points) Hydrogen ’ s electrons jump from high to low energy which releases a photon, and those photons appear in lines of different colored lights based on the different wavelengths. 2. Are more than 4 transitions occurring when excited hydrogen atoms are relaxing? Explain why you think there are or are not more than 4 transitions occurring. (2 points) Yes there are. 3. Using equation (3) for the H atom, at what wavelength would the transition from n upper = 7 to n lower = 2 appear? Is this higher or lower in energy than the 4 transitions seen in the emission spectrum? Explain why this is the case. (2 points) The transmission of H would appear at 396.79 nm. This is much lower in energy than the 4 other transmission where the lowest one in energy was 409.95 nm (my

calculation)/411.38 nm (actual). This is the case because the wavelength would decrease as the quantum number increases. 4. Why are different emission spectra observed for the different elements in part 2? (2 points) Because each element has different numbers of protons and different arraignments of electrons so they give off different energy levels. 5. In the Star- Spangled Banner, there is a reference to the ‘rocket’s red glare.’ Which metal might have been in the rockets to cause the ‘red glare’? Explain your answer based on your observations in part 3. (2 points) From what I remember, it might have been either Ca^2+ because it burned red and emitted sparks, or Sr^2+ which burned a bright red and had a longer flame. F. Conclusions ( 5 Points, ~100-150 words ) : for this experiment, I was able to as accurately as possible calculate for wavelength using transition of delta E and upper and lower quantum numbers. Part two, I ’ m not as confident I recorded my data accurately nor was able to use the spectrum tube carousel, two of the ones I used started smoking and emitting a strong smell, so I couldn ’ t accurately use them to record the spectra so that must ’ ve skewed my observations a bit. Part three was straightforward, I only had to use my eyes to record the colors each metal had and was able to see how different elements emit different wavelengths that change the colors the present as.

Related Documents

Worksheet #2.pdf

HW4 - Caisson QTO Assignment.pdf

CHEM120 Wk.3 Lab.docx

CHEM120 Wk.4 Lab.docx

CHEM120 Wk.2 Lab_Completed.docx

MolarMass_Acid_223.docx

Acid-base titrations Lab Report.pdf

Stoichiometry lab report .pdf

Periodic properties lab report.pdf

Enthalpy lab report.pdf

Chromatography Lab Report .pdf

Bromobutane Post Lab .docx

Recommended textbooks for you

Chemistry: Principles and Practice

Chemistry

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Cengage Learning

Chemistry & Chemical Reactivity

Chemistry

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:Cengage Learning

Chemistry & Chemical Reactivity

Chemistry

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:Cengage Learning

Chemistry for Engineering Students

Chemistry

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Cengage Learning

Chemistry In Focus

Chemistry

ISBN:9781337399692

Author:Tro, Nivaldo J.

Publisher:Cengage Learning,

Chemistry by OpenStax (2015-05-04)

Chemistry

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:OpenStax

SEE MORE TEXTBOOKS

Recommended textbooks for you

Chemistry: Principles and Practice
Chemistry
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Cengage Learning
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Chemistry for Engineering Students
Chemistry
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Cengage Learning
Chemistry In Focus
Chemistry
ISBN:9781337399692
Author:Tro, Nivaldo J.
Publisher:Cengage Learning,
Chemistry by OpenStax (2015-05-04)
Chemistry
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:OpenStax