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  Chemistry for ages 4 to 7


Poppers


Purpose  To compare the size of popped and unpopped corn.


Materials
2 bags of microwave popcorn
1-cup (250-ml)  measuring cup
microwave
timer
2-quart (2-liter) bowl


Procedure
1.
Open one of the bags of popcorn and pour it into the measuring cup. Record the amount of corn in the bag.


2. Adult step  Place the sealed bag of popcorn in the microwave and heat it for the length of time indicated on the bag.


3. Allow the bag to cool for 5 minutes, then remove it from the microwave and open. CAUTION: Popcorn from the microwave can be very hot. Do wait a full 5 minutes to allow it to cool before opening.


4. Measure the heated popcorn. Do this by filling the measuring cup with popcorn, then pouring the popcorn into the bowl. Continue measuring until all the popcorn has been poured. Add up the number of cups (ml) of popcorn.


So Now We Know
When popcorn kernels are heated, they get bigger because the water inside turns into a gas. This change of a liquid to a gas is called evaporation. The popped kernels generally take up about twelve times as much space as do the unpopped kernels. 

 
   

   
 
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