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Observed Wavelengths of Discrete Spectral Lines

 CHM201 General Chemistry and Laboratory I

Laboratory 8. Spectroscopy

Name

Group

PLEASE ENABLE EDITING BEFORE FILLING OUT THIS REPORT!

No report will not be accepted for credit after that time.

Grade:

Lab average to date:

Overall average to date:

Results: (You may attach a copy of your group data.) (70 pts)

1. Qualitative analysis:

Source

Observations

Fluorescent

Room Lights

Incandescent

Light Bulb

2. Colored Light Bulbs:

Incandescent Light Bulb

Color

Observations

Bulb #1

Bulb #2

3. Discharge Tubes:

Tube Contents

Observed Wavelengths of Discrete Spectral Lines

hydrogen

helium

neon

mercury

4. Wavelength of a Low Power Laser

Observed Wavelength(s) of Discrete Spectral Line(s)

Description of the laser as compared to other line sources

Questions: (30 pts)

1. Identify a light source that is continuous, one that exhibits line spectrums and one that shows both (if any). How many spectral lines were observed for each?

Light Source

# of Spectral Lines

2. Go online and find the spectrums for the four discharge tubes. Did your observations differ from these published data? If so, why do you think it differed? Record the url for the page you visited for each spectrum.

Spectrum

Same? (Yes/No)

Reason

3. Do a little investigation and explain ( briefly ) why the laser’s spectrum appeared as it did

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