Room 3 Scientists make a bag go POP!

Room 1 and 3 got together to do an amazing experiment.  We made a bag go POP!!  It was very very exciting!
We added baking and soda and water to a bag.  We passed it around so that everyone could feel it.  It felt COLD.
We added damprid and water to another bag.  We passed it around so that everyone could feel it.  It felt WARM.
We added damprid, baking soda and water to another bag.  We watched the bag patiently.  We observed that the bag got bigger and bigger and bigger then it went......... POP!!