Exploding Lunch Bag: We combined warm water, vinegar and baking soda in a Ziploc bag. As soon as the bag was sealed shut it started to fill with air (carbon dioxide). Eventually, the Ziploc bag could no longer hold any more air so it popped. We learned that this is called an acid based reaction when you combine these two chemicals together.

 

Chemical warmer:

We combined a mineral filler, zinc and water together in a plastic bag.

Then we placed a thermosticker that changes color at around 120 °F on the plastic bag.

After that we added copper which is a less active metal than zinc. The zinc reacted with the copper, as it dissolved in the water it caused heat that was easily felt.

Thermal Chameleon:

First, we crushed up some ice and placed it in a cup.

Then we put 2 ml of water on a cork stand and placed the cup on top of it to see if the cup of ice would freeze to the cork stand.

The ice by itself didn’t freeze the water on the cork stand. So, we added some calcium chloride.

The mixture of the ice and calcium chloride ended up freezing the water on the cork stand.