A small glass or clear plastic
jar appears to contain only water and a small string noose hanging down
into the water. When the string is lifted out, a large shiny crystal
appears tied in the noose. When the string is lowered back into the
water, the crystal again disappears. That’s a Disappearing Crystal!
This activity comes complete with several small crystals, instructions
and an explanation of the science connected with the experiment. The
crystals are safe and non-toxic. Disappearing Crystals can be used over
and over again for hours of wonderment and fun! Disappearing Crystals
have been used in science fair projects and magic shows. Also these
crystals make ideal premiums for distribution by private school
admission officials when they conduct open-house tours. [Read how]
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UV-sensitive beads contain
photo-chromatic dyes that react to ultraviolet light and cause the
normally white beads to change into vibrant colors when exposed to the
sunlight. The UV Detector contains these sensitive beads inside of a
clear plastic or glass tube. When the detector is shielded from UV
radiation, the beads are white. When exposed to UV radiation the beads
turn purple. The detector contains a color scale which enables the user
to determine the level of UV radiation.
The UV Detector can be used by teachers and home schooling parents when
teaching a unit on electromagnetic waves, also to help boys and girls
develop an understanding of ultraviolet radiation, to measure UV light
intensity, develop an understanding of the effects of UV radiation on
the skin. UV tubes can be used in science fair projects to test the
effectiveness of sunglasses and commercial sunscreens. [Read
how]
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Allelopathy is the name given by
which some plants chemically inhibit the germination, or growth of
competitors. The chemicals may be released from plant cell tissues
directly into the air (volatile chemicals), or released into the soil
from the roots or from decomposing leaves. The all time champion for
studying allelopathy is The Black Walnut Tree, which produces a potent
pesticide and herbicide called “juglone” (5 hydroxy-1,
4-napthoquinone), which occurs naturally in all parts of the tree and
thereby creates a protective zone around the Black Walnut Tree.
Designed as a hands-on activity this kit includes everything needed for
student investigators to compare the allelopathic affects of juglone,
the chemical agent produced by the Black Walnut tree, on fast growing
plants over the course of 7 days and its biodegradability in soil.[Read how]the allelopathy investigation activity makes an excellent science fair project.
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Science In A Bag
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