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S U N S H I N E C H R I S T I A N B I L I N G UA L S C H O O L
A N T O N I O R O D R Í G U E Z
M R . J O S É P O P O F F
C H E M I S T RY L A B R E P O RT: E N E R GY O F E L E C T R O N S
0 3 / 0 7 / 2 0 1 3
INTRODUCTION
Electromagnetic Radiation
The characteristics of electromagnetic radiation are that energy
can travel by a combination of an electrical and magnetic field,
radiation means that it can travel through a vacuum. Emission
spectrum shows bright lines or bands of color, this means that it
emits or reflects the colors. Absorption spectrum has intermittent
dark lines, so it means that it absorbs the colors.
OBJECTIVES
Observe how a simply diffraction grating
spectroscope works.
Observe and draw the spectra of several salts.
MATERIALS
Bunsen Burner
Lithium Chloride
Potassium Chloride
Copper (III) Chloride
Sodium Chloride
Calcium Chloride
Weight Paper
Copper (II) Sulfate
Color Pencils
Diffraction Grating
Spectroscope
Matches
Presoaked Wood Splints
Incandescent Light
PROCEDURE
1.First I observed the incandescent light, which was hydrogen. I
observed the incandescent light’s spectrum with the diffraction
grating spectroscope.
2.We labeled 6 weight papers with the names of the salts, one salt per
paper.
3.After that, we lighted the Bunsen burner and we adjusted it until we
saw that the color of the flame was light blue or slightly colorless.
4.Then, we dipped one soaked wood strip into a salt and burned it in
the Bunsen burner.
5. We stared at the light emitted by the salts when
being burned with de diffraction grating
spectroscope.
6. After that, we filled in the data table with what we
saw while doing the test.
7. We repeated step #4 with all the salts.
PROCEDURE
Lithium Chloride
POTASSIUM CHLORIDE
IRON (III) CHLORIDE
SODIUM CHLORIDE
CALCIUM CHLORIDE
COPPER (II) SULFATE
DATA ANALYSIS
1.Since each element produces a characteristic
spectrum, what can you conclude about the location
of the electron?
A/= that the location of an electron affects the
spectrum or “color” of the light.
DATA ANALYSIS
2. If you had observed only the color if the flame as
the salt burned, you would have conducted a flame
test. Would you say that a flame test or a
spectroscopic test is more accurate? Why?
A/= I would say that the spectroscopic test is more
accurate because there is less chance of human error.
DATA ANALYSIS
3. Suppose that you had used the same wooden splint to
burn all the salts in the flame. What difficulty could this
have introduced?
A/= If we would had used the same wooden splint to burn
all the salts in the flame, we would have some remains of
other salts in the splint, making it a compound, and if that
would happen the spectrum would be different.
DATA ANALYSIS
Helium was discovered in the sun before it was
discovered on the earth. How could this be?
A/= Because it has a very low density, therefore it
was not found in the sea nor on the surface of the
earth’s crust, not even in the Atmosphere there was
found a considerable amount of it.
CONCLUSIONS
We concluded that there are two types of visible light spectra
that can be distinguished, emission and absorption.
We can observe the wavelength of a light by using a diffraction
grating spectroscope.
The bright lines that we see in the diffraction grating
spectroscope are produced when the atoms receive energy and the
valence electrons get “excited”.