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Flame TestFlame Test
LabLab
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
By placing atoms of a metal into
a flame, electrons can be induced
to absorb energy and jump to an
excited energy state, a quantum
jump.
P.Koper, "Did someone's Quantum Jump?" Oil on linen 154cm w 136cm h
When an electron temporarilyWhen an electron temporarily
occupies an energy state greateroccupies an energy state greater
than its ground state, it is in anthan its ground state, it is in an
excited state.excited state.
An electron can become excited ifAn electron can become excited if
it is given extra energy, such as ifit is given extra energy, such as if
it absorbs a photon, or packet ofit absorbs a photon, or packet of
light or collides with a nearbylight or collides with a nearby
Electrons do not stay in excitedElectrons do not stay in excited
states for very long - they soonstates for very long - they soon
return to their ground states, emittingreturn to their ground states, emitting
a photon with the same energy as thea photon with the same energy as the
one that was absorbed.one that was absorbed.
When the electrons of a certain
atom return to lower orbitals from
excited states, the photons they
emit have energies that are
characteristic of that kind of
atom. This gives each element a
unique fingerprintunique fingerprint, making it
possible to identify the elements
present in a container of gas, or
even a star.
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
The amount of energy in the photon
determines its color; red for the
lowest energy visible light,
increasing energy through the
rainbow of orange yellow green blue
indigo, and finally violet for the
highest energy visible light. Photons
outside the visible spectrum may
also be emitted, but we cannot see
them.
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
We can view this “emission
spectra” of visible colors with
the naked eye. It will appear to
be one color. OR – we can view
the separate colors of the
emission spectrum by using a
spectroscope.
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
The spectroscope bends light of
different energies differently.
Low energy red light, is bent the
most, and high energy violet the
least. This allows us to see the
various distinct colors of the
emission spectrum of a sample.
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
Inthislabwewillrecordthe
flametestcolorofseveral
metalsbypassingthemetal
saltscapturedonthewooden
splintsintoabunsenburner
flame.
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
Thehumaneyeseesyellowvery
well, sinceitisinthemiddleofthe
spectrumvisibletotheeye. Colors
attheedgesofthevisiblespectrum,
especiallyviolet, aremoredifficult
tosee. Typically, cobaltblueglass
filtersareoftenusedwhenviewing
mixturesofmetalstoscreenout
lightthatisyellowincolor.
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
Cobaltglassabsorbslightinthe
yellowwavelengths, butis
transparenttolightofhigher
energy(thisiswhyitlooksblue!).
Viewingayellowflamethrough
cobaltglasswillallowyoutoseeif
thereisanyhigherenergylight
present. Nocobaltblueglassfilters
inourlabnow.
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
Finally, wewillusethedatawe
collecttoidentifyametalinan
unknownsaltsolution. This
processissimilartothe
procedureusedbychemical
laboratoriestoidentifythe
make-upofchemical
contaminationinchemical
spills, landfills, industrialsites,
What Are We Doing in thisWhat Are We Doing in this
Lab?Lab?
Iwilldemonstratethe
procedure. Youwillneedto
createadatatabletoreport
results.

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Flame test lab

  • 2. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? By placing atoms of a metal into a flame, electrons can be induced to absorb energy and jump to an excited energy state, a quantum jump.
  • 4. When an electron temporarilyWhen an electron temporarily occupies an energy state greateroccupies an energy state greater than its ground state, it is in anthan its ground state, it is in an excited state.excited state.
  • 5. An electron can become excited ifAn electron can become excited if it is given extra energy, such as ifit is given extra energy, such as if it absorbs a photon, or packet ofit absorbs a photon, or packet of light or collides with a nearbylight or collides with a nearby
  • 6. Electrons do not stay in excitedElectrons do not stay in excited states for very long - they soonstates for very long - they soon return to their ground states, emittingreturn to their ground states, emitting a photon with the same energy as thea photon with the same energy as the one that was absorbed.one that was absorbed.
  • 7.
  • 8. When the electrons of a certain atom return to lower orbitals from excited states, the photons they emit have energies that are characteristic of that kind of atom. This gives each element a unique fingerprintunique fingerprint, making it possible to identify the elements present in a container of gas, or even a star.
  • 9. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? The amount of energy in the photon determines its color; red for the lowest energy visible light, increasing energy through the rainbow of orange yellow green blue indigo, and finally violet for the highest energy visible light. Photons outside the visible spectrum may also be emitted, but we cannot see them.
  • 10. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? We can view this “emission spectra” of visible colors with the naked eye. It will appear to be one color. OR – we can view the separate colors of the emission spectrum by using a spectroscope.
  • 11. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? The spectroscope bends light of different energies differently. Low energy red light, is bent the most, and high energy violet the least. This allows us to see the various distinct colors of the emission spectrum of a sample.
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  • 14. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? Inthislabwewillrecordthe flametestcolorofseveral metalsbypassingthemetal saltscapturedonthewooden splintsintoabunsenburner flame.
  • 15. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? Thehumaneyeseesyellowvery well, sinceitisinthemiddleofthe spectrumvisibletotheeye. Colors attheedgesofthevisiblespectrum, especiallyviolet, aremoredifficult tosee. Typically, cobaltblueglass filtersareoftenusedwhenviewing mixturesofmetalstoscreenout lightthatisyellowincolor.
  • 16. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? Cobaltglassabsorbslightinthe yellowwavelengths, butis transparenttolightofhigher energy(thisiswhyitlooksblue!). Viewingayellowflamethrough cobaltglasswillallowyoutoseeif thereisanyhigherenergylight present. Nocobaltblueglassfilters inourlabnow.
  • 17. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? Finally, wewillusethedatawe collecttoidentifyametalinan unknownsaltsolution. This processissimilartothe procedureusedbychemical laboratoriestoidentifythe make-upofchemical contaminationinchemical spills, landfills, industrialsites,
  • 18. What Are We Doing in thisWhat Are We Doing in this Lab?Lab? Iwilldemonstratethe procedure. Youwillneedto createadatatabletoreport results.