Chemical Reactions Links
Endothermic ReactionsEndo just means within and thermic just means heat - so what we have there is a reaction that takes in, or absorbs, heat. That is pretty much it! If a chemical reaction takes in heat it is called endothermic.
This can be nicely illustrated to kids by doing the really fun hands-on-activity of making ice cream in a baggie.
I know - that is nothing new. In fact, we've all done it before, I'm sure. But was it ever properly explained to you?
I see this little experiment all over the web but few websites even mention that the reaction is endothermic, some say the obvious (the salt lowers the temperature) and most say nothing at all about the chemistry involved.
But we're homeschoolers - so we must know these things!
So, here it is - the Ice Cream in a Baggie Experiment with all the gory science details no one else cares about...
Add Milk to small baggies
Add Cream to same baggie
Add Sugar to same baggie
What you get here is a nice little density experiment! But that is for another time - just enjoy the pretty layers....
Add vanilla or other flavoring...
Put smaller baggies inside the larger one - make sure the smaller baggies are sealed tight! Then shake-shake-shake! For about 10 minutes....
The Science of Ice Cream in a Baggie
Remember the First Law of Thermodynamics which states: Heat can only be transferred from a hotter substance to a colder substance. The heat is LEAVING the ice cream mixture at a faster rate with salt and ice, than with just ice alone.
Links to Student Help pages:
Endothermic Reactions (Fun activity)
Exothermic Reactions (Fun Activity)
Astronomy for Kids
How to Use a Sky Map
Astronomy Unit Study/Activities
What is Molecular Biology
DNA Replication Enzymes
DNA Replication Mechanism
What is Cell Biology
The Endomembrane System
Vesicles and Cellular Transport
The Plasma Membrane
Parts of a Plant
Plant Life Cycle 1
Plant Life Cycle 2
Cell Cycle Mitosis
Cell Cycle Control