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
Absorption and Emission
of Light in a Flame
When a substance is
heated in a flame, the
substances electrons
absorb energy from the
flame.
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.
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).
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!
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.
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).
Absorption and Emission
of Light in a Flame
The color of light varies
from substance to
substance, depending on
the electron configuration.
How is each
substance unique?
•Difference between
energy levels
•Exact energy of the
emitted photon
•Corresponding
wavelength and color
EMS
The visible portion of the
EMS is only a small part
of the entire spectrum.
Types of Emissions
Radio wavesRadio wavesRadio wavesRadio waves
Used for radio and
television communication
Types of Emissions
MicrowavesMicrowavesMicrowavesMicrowaves
Used in radar signals and
microwave ovens
Types of Emissions
Infrared radiationInfrared radiationInfrared radiationInfrared radiation
Given off in the form of heat
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
Types of Emissions
Ultra Violet (UV)
Given off by the SUN
Types of Emissions
XXXX----RaysRaysRaysRays
Used to
detect
bones
and teeth
Types of Emissions
Gamma Rays
May be given off by
radioactive materials
Types of Emissions