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Gaines, Patricia A. O. W. Holmes School
I. Students will understand that eggshells are porous by:
A. Examining various dyed eggshells
B. Telling their similarities and differences
C. Examining shells from boiled and raw dyed eggs
D. Explaining why color may be on the inside or outside
II. Students will understand the value of porosity of eggshells by:
A. Discussing prior knowledge of "coverings" on various
objects, animals, and people
B. Explaining the need for "covers" on objects, animals,
C. Discussing the necessity of holes in eggshells
Several empty dyed eggshells (on outside only)
Several empty dyed eggshells (on inside only)
Boiled dyed and undyed eggs - 1 per child
Raw dyed eggs - 1 per child
Food coloring (red, yellow, green, blue)
Large beaker, water
5 small beakers
Copper wire - cut into 6 inch strips
(For Science Table Display On "Coverings")
Vegetables - carrot, radish, potato
Fruits - peach, grapes, banana
Canned goods, packaged goods
Glass and plastic bottled liquids
Animals - furry, plastic, vinyl
1. Have students view objects on science table. Discuss the types of
"covers" on the objects and their usefulness. Relate and compare
to the covering on an egg.
2. View and discuss a variety of colored empty eggshells (some dyed
on the inside only, others only on the outside).
3. Carefully peel dyed eggshells from a boiled and then a raw
egg!!! Examine, compare, and contrast the two shells.
4. Explain why some shells seem to have allowed more dye to seep
through (size of dye molecule, size of "holes" in eggshells).
5. Explain need for holes in eggshells (to allow embryo to breathe).
6. Have students explain and demonstrate techniques in dying eggs and