Problem:
Materials:
Cornstarch water 2 small beakers Stirring Rod Dropper
Procedure :
1.
Put
15 g of cornstarch in one of the beakers. In the other beaker pour 10 mL of
water.
2.
Using
the medicine dropper, gradually add one dropper full of water to the
cornstarch. Stir the mixture.
3.
Continue
adding water, one dropper full at a time until. Stir the mixture after each
addition. When the mixture becomes difficult to stir, stop adding water.
4.
Try
to pour the mixture into your hand. Try to roll the mixture into a ball and
press it.
5.
Place
your mixture in the large beaker. Clean up your lab area.
Observations:
1.
Before
the addition of the water was the cornstarch solid, liquid, or gas?
2.
What
was the phase of the water?
3.
When
you try to pour the mixture into your hand, does the mixture have the
properties of a solid, liquid, or gas?
4.
When
you try to roll the mixture into a ball and apply pressure, does the mixture
act like a solid, liquid, or gas?
Conclusions:
1.
How
is the mixture of cornstarch and water like the earth’s mantle?
2.
How
is the mixture different from earth’s mantle?
3.
How
might the plasticity of the mantle influence the movement of the earth’s
lithospheric plates?