flame test - university of pennsylvania school of arts and ...redding/flametest.pdfflame test and...
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Flame TestFlame TestFlame TestFlame Test
and the EMSand the EMSand the EMSand the EMS
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Absorption and Emission
of Light in a Flame
When a substance is
heated in a flame, the
substances electrons
absorb energy from the
flame.
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Absorption and Emission
of Light in a Flame
This absorbed energy allows
the electrons to be
promoted to EXCITEDXCITEDXCITEDXCITED
energy levels and the
electrons are “kicked up
notch” to a higher energy
level.
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Absorption and Emission
of Light in a Flame
The electrons naturally
want to make a transition,
or RELAX, back down to
the ground state (lowest
energy level).
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Absorption and Emission
of Light in a Flame
When an electron makes a
transition from a higher
energy level to a lower
energy level, a particle of
light called a photon is
emitted.We are PHOTONS!
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Absorption and Emission
of Light in a Flame
The energy of a photon is
equal to the difference in
energy between the
excited state and the
state to which the
electron relaxes.
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Absorption and Emission
of Light in a Flame
The energy of the emitted
photon determines the color
of light observed in the flame
(expressed in
WAVELENGTHSAVELENGTHSAVELENGTHSAVELENGTHS).
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Absorption and Emission
of Light in a Flame
The color of light varies
from substance to
substance, depending on
the electron configuration.
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How is each
substance unique?
•Difference between
energy levels
•Exact energy of the
emitted photon
•Corresponding
wavelength and color
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EMS
The visible portion of the
EMS is only a small part
of the entire spectrum.
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Types of Emissions
Radio wavesRadio wavesRadio wavesRadio waves
Used for radio and
television communication
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Types of Emissions
MicrowavesMicrowavesMicrowavesMicrowaves
Used in radar signals and
microwave ovens
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Types of Emissions
Infrared radiationInfrared radiationInfrared radiationInfrared radiation
Given off in the form of heat
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Types of Emissions
Visible LightoSmall portion of the EMS
oWavelength region between 400 and 700nm
oAs the color of light changes, so does the amount of energy it possess
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Types of Emissions
Ultra Violet (UV)
Given off by the SUN
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Types of Emissions
XXXX----RaysRaysRaysRays
Used to
detect
bones
and teeth
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Types of Emissions
Gamma Rays
May be given off by
radioactive materials
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Types of Emissions