Download Regents Chemistry

Regents Chemistry
Name:
Lab # 8: Observing Bright Line Spectra
Pre-lab Questions:
1.
2.
3.
4.
5.
As frequency increases what happens to wavelength and energy?
What is the mathematical relationship between frequency and wavelength?
What is the difference between a continuous spectrum and an emission spectrum?
How is an emission spectrum formed?
What is the purpose of passing an electric current through the gas in the
discharge tubes?
6. Consider the colors of visible light (ROYGBIV), which color has the greatest
energy and which color has the least energy.
7. If an excited gas produces several different wavelengths of color why do we only
see one color as we observe the discharge tube with our eyes?
Conclusion Questions:
1. Do the electrons of the elements you examined give off all the colors of light in
the visible spectrum? Explain why or why not?
2. What evidence indicates that electrons move around the nucleus in definitive
pathways?
3. Each element has its own characteristic bright line spectra. Why do you think
this is so?