We did a fun experiment today using Bromothymol Blue (BTB), which is a chemical that changes color when exposed to acids or bases.  I purchased it on Amazon.com from a chemical supplier pretty inexpensively, and you only need to use a little – just put a small amount in a cup and add water. To set up the experiment, I set out several clear plastic cups and got out our various supplies.  I filled the cups half full with the BTB / water mixture and then let the kids take turns adding things to see what would happen.  The older kids created a table toRead More →

This is a fun experiment from Steve Spangler Science… my crew had a great time guessing which substances would sink or float, and spent several hours playing with it after I went through it with them! Here’s a link to the experiment details:  http://www.stevespanglerscience.com/experiment/seven-layer-density-column Thanks Steve Spangler!Read More →