What's the Matter?

We had been learning about observable properties of matter, so I had a fun activity planned. I placed 5 different white substances in bags and had each group predict what it was and then use their observations to test their hypothesis. And yes, they even tasted them, which worried a few of them until I assured them I wouldn't let them taste anything that could hurt them. But I'm glad they know to be cautious scientists when experimenting :)  By the end of the activity, they discovered each group had a different substance. There was powdered sugar, baking soda, salt, sugar, and flour. Needless to say, they weren't too thrilled if they didn't have the bags of sugar. It was fun watching them and hearing all of their wonders and observations.