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Unit 12: Alternative Energy Page 25 of 31
help you explain this reversal of Ask an adult to remove the pan of
the image. Epsom salt from the hot oven using
Repeat this experiment using two an insulated mitt. Place the pan on
magnifying lenses. Observe the the stovetop and allow it to cool for
effect of moving the positions of ten minutes. Make sure the oven is
the two lenses relative to each turned off.
other and the wall. Add one-quarter cup of the Epsom
Experiment: Can a Salt Be Used salt that was not heated in the
for Heating and Cooling? oven to a small plastic zipper-close
bag. Next add one-quarter cup of
room temperature water to the
Materials bag, seal, and shake the bag. Feel
the temperature of the outside of
Epsom salt
the bag.
Aluminum pie pan
Next add one-quarter cup of the
Water cooled Epsom salt that was heated
Oven in the oven to the second zipper-
close bag. Add one-quarter cup of
Two small, zipper-close,
room temperature water to the bag
Insulated mitt and seal the bag. Give the bag a
plastic bags couple of shakes and then feel the
outside of the bag.
Sink
When you are finished with this
Measuring cups
experiment, pour the contents of
both bags down a sink drain. Then
Procedure flush the bags and the sink with
water. Also rinse out the aluminum
Ask an adult to turn on the oven pie pan with water. DO NOT DRINK
and to set the temperature of the ANY OF THE LIQUID AND DO NOT
oven to 450° F (232°C). Pour one- EAT ANY OF THE EPSOM SALT.
half cup of Epsom salt into an EPSOM SALT CAN MAKE YOU SICK
aluminum pie pan and gently IF YOU EAT IT.
shake it to evenly spread the
Epsom salt over the bottom of the Observations
pan. Place the pie pan in the oven. Do you notice any difference in the
Heat the Epsom salt in the hot appearance of the Epsom salt after
oven for thirty minutes. it is heated in the oven? Does the
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