With only nine substances the 8th grade had to find a combination of two or three to create one. It was harder than they thought and took long than they thought. There was a lot of disagreeing, but the 20 scientist would have to agree on one. They mixed and experimented with the nine substances. Then the scientist kicked some out and kept some in. They experimented with one by itself and a few together. Finally, they decided on one, Baking Soda and Citric Acid. The scientists found lots of evidence for physical properties. The Citric Acid is less than .25 of a mm, some pieces are less and some are more. The texture was soft powder. It also had some rough chunks in it. It also has a steam like substance around the well. For chemical properties
