Baggie Experiment

First we add the phenolphthalein to the baking soda.

We notice a chemical change in color (because it changes from white to magenta).

Next we add the calcium chloride to the phenolphthalein/baking soda mixture and we notice a chemical change in color (because it changes from pink back to white), a chemical change in temperature (because it gets really hot) and a chemical formation of gas (because the bag expands).

I forgot to record a video during class, so here's Lela doing the experiment...