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Element Identification and Emission Spectra
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Name __________ |
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Metal ion |
Flame color |
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barium |
_________________________ |
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calcium |
_________________________ |
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sodium |
_________________________ |
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rubidium |
_________________________ |
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potassium |
_________________________ |
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lithium |
_________________________ |
Part 1 Flame tests for unknown elements
Unknowns
Flame
color Identity
of metal ion based on flame test Unknown 1 ____________ __________ Unknown 2 ____________ __________
Part 2 Emission
line spectra for selected elementsreturn
to procedure
Element Emission Emission spectrum Sodium Neon Mercury Helium
How do these emission
spectra compare in terms of colors and numbers of emission line positions?
Are the spectra
identical? What if anything
is similar? What is different?
Examine the spectra
for the elements Na, Ne, Hg or He and answer the following questions. FILL IN THE FOLLOWING
TABLE WITH YOUR ANSWERS
Element
with greatest number of visible emission lines __________________
Longest
wavelength in the spectrum of this atom in nanometers. __________________ Color of
light for this longest wavelength __________________
Examine the spectra
for the elements Na, Ne, Hg or He and answer the following questions. FILL IN THE FOLLOWING
TABLE WITH YOUR ANSWERS
Element with
fewest number of emission lines __________________ Longest wavelength
in the spectrum of this atom in nanometers __________________ Color of light
for this longest wavelength __________________ What suggestions
do you have additions or changes to this experiment? What "new" idea
did you learn from this experiment? Why does a sodium
vapor street light look yellow instead of white? What would you expect
to happen to the size (volume) of a hydrogen atom when the outer electron
moves from the n = 2 shell to the shell with n = 4 ?
return
to procedure
Revised March 27, 2002 All rights reserved. Dr. Walt Volland (Copyright 1999-2002)