University:
Florida Atlantic University
Course:
CHM 1045 | General Chemistry I
Academic year:

2023
Views:

41

Pages:

3
Author:

Anett V.

Name: A nett Vila PID: 6353348 CLUE Curriculum Florida International University Worksheet 2.4 Spectroscopy BE SURE TO INCLUDE ALL WORK AND UNITS! 1. The emission spectrum for helium is given below Red a. Yellow Draw energy diagrams to help you construct a step-by-step description for the processes involved in the production of an emission spectrum. Be sure to include both the processes by which energy is absorbed and emitted. excit Must energy before you can Emis ion ↑ a First absorb Blue ⑳ * losest emit it nn n to - - b. ↓ 2 1 ↑ emits 7 6 Before . - - a photon 1 1 S-1 absorption nucleus , most elect . Now , reverse T starts here must Emits n-4 stepl 4 - 4 stable emissions electrons > can be excite electricity Draw an energy diagram to compare the possible electron transitions that would produce the red emission line at the left of the spectrum and the blue line at the far right of the diagram. n4 Blue a n - 3 photog Photonyellow n largest ↓ n-1-2 gap blc attraction so transition V z n - - - 1 Emits large energe 2 Photon /red emitted Name: Anett Vila PID: 6353398 CLUE Curriculum Florida International University c. Explain why we use energy diagrams to illustrate electron transitions, rather than using a Bohr model of the atom. Bohr's it an has model an observer doesn't exact orbit work and because when sue add electrons behame diffrent 2a. You can calculate the deBroglie wavelength of any object from the equation λ = h/mv. If you are given the mass in kg and the velocity in m/s, using the fact that 1J = 1kg.m2/s2, show what units you would get for λ. b. The mass of a neutron is 1.6749 x 10-27 kg. How fast would it have to travel to be diffracted by a sheet of aluminum foil (the spacing between Al atoms in aluminum foil is about 300 pm) c. If we had a 145 g baseball what speed would the baseball have to move at to have the same wavelength as the neutron above? CLUE Curriculum Florida International University Helpful Equations and Constants: E = hn c = ln h = 6.626 ´ 10 - 34 J s c = 3.0 ´ 10 8 m s 1J = 1kg.m2/s2 1 pm = 1 x 10–12 m Name: PID:

Spectra and electrons

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