Demo
Name |
Brief Description |
Demo Notes |
Demo # |
Type of Item |
Tyndal effect-chemical sunset on overhead projector |
Na
thiosulfate and HCl; disproportionation.
Can be tricky. A cardboard
sheet containing a small hole is placed on the overhead projector. A solution is added to beaker containing a
different solution which changes the color of the light projected to resemble
a sun set. |
|
65 |
Demonstration |
Polarizers |
Plastic between polarizers, sugar rotates light,
kaleidoscoptical sugar rotation. One
sheet is taped to a flashlight. The
other sheet is rotated until light from the flashlight is obstructed. |
Also on Shakashiri tape 1 # 19; tape III #43 |
108 |
Demonstration |
Polarizers |
One
sheet is taped to a flashlight. The
other sheet is rotated until light from the flashlight is obstructed. |
Shakashiri
tape 1 # 19; tape III #43 |
M37 |
Movie |
Neon
lights experiment |
Tesla coil and gas tubes - the gases are excited, then give off
light characteristic of the gas |
|
3 |
Demonstration |
Flame
tests of metals |
metal
solutions, wire loop or soaked splints - the colors are characteristic of the
metal salt |
|
4 |
Demonstration |
Combustion
of magnesium in carbon dioxide (dry ice block) |
The burning is bright enough to light up the entire lecture hall |
|
16 |
Demonstration |
Chemiluminescence |
DMSO,
KOH, luminol shaken for reaction, or longer lasting solution in COOL
sign. Chemicals are mixed and glow in
the dark. |
The
potassium hydroxide version can be carefully passed around and shaken. The cool version is good for chem
circuses. Also on Shakhashiri tape 1
#5 oxidation of luminol; Close up on Chemistry Ealy 26:36 (1:45 min) |
27 |
Demonstration |
Burning magnesium in air, pH effect |
Mg in air: Hold a 6" strip of Mg ribbon with big metal
tongs. Turn off room lights and light
Mg with the propane torch (and turn off torch). The Mg burns so brightly that you shouldn't
look directly at it, or you will have trouble seeing for a minute or so. pH effect: burn it over a watch glass and
dissolve the ashes in deionized water containing phenolphthalein to show it
turn pink. |
|
68 |
Demonstration |
Dispersion of visible light by prism on overhead
projector |
Can
use a flashlight to project the rainbow on the wall or ceiling, too. Takes some practice to get a good spectrum. |
301,
304K |
95 |
Demonstration |
Fluorescence due to chlorophyll from leaves |
Boil the leaves and observe the extract in a test tube. Shine a flashlight on it to observe a
reddish fluorescent tinge. thionin 2
faced reaction. |
Best in a small room. |
113 |
Demonstration |
glowing electric pickle-UT, the eyes of Texas are
upon you |
UT
is spelled out on a plastic grid using specially wired pickles. The wires are plugged in causing the
pickles to glow yellow orange. A
smaller version uses a single pickle stuck on nails of a board. |
The
small version can be available routinely, but the larger version takes a
longer prep time-at least 1 hour. Can
have class sing the eyes of Texas while UT pickle glowing. |
135 |
Demonstration |
Florescence |
White florescence, fluorescence of tonic water, fluorescent
dyes. Paper and soaps are looked at
with UV light, tonic water (even flat) looks blue due to quinine, flourescent
dyes change colors with UV light vs visible |
|
144 |
Demonstration |
Chemiluminescence |
Chemicals
are mixed and glow in the dark. |
Shakhashiri
tape 1 #5 oxidation of luminol |
M6 |
Movie |
Chemiluminescence |
Chemicals are mixed and glow in the dark. |
Close up on Chemistry
Ealy 26:36 (1:45 min) (Set timer to zero when first text rolls on screen.) |
M7 |
Movie |
Reaction
of sodium and chlorine |
Not
available - may be able to do in a hood, outside, or tape demo for use in
class. |
risk
of chlorine gas release |
07.x |
Demonstration |
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