Essay Richard Nguyen My group and I analyzed four different unknown substances. We separately added iodine and vinegar into each of the substances. Then we identified it using what we saw. We made a chart that helped classify what the substance was. We had to identify if the substance turned blue or black if we added iodine or vinegar into it. And we had to see if how the substance reacted with iodine and vinegar. We examined if the substance produced gas bubbles or if it dissolve. And we also had to see if the substance turned blue/black or brown. If we saw any of these things, we would mark it with “x”s on our chart. Then we were had to identify by looking at our lab sheet and matching the characteristics with what clues we were given. Our first substance ended up being cornstarch. We identified this when we added iodine to it and it was blue/black. Then we added vinegar to it and we dissolved it. Then we had to classify what it was by looking at our chart and comparing it to the lab worksheet clues. When we finally matched it up we ended up having to deal with cornstarch. We learned that cornstarch turns blue/black when you add iodine to it, and it dissolves when you add vinegar to it. Then we were left with three more substances to identify. The second substance was baking powder. Baking powder reacts to iodine by turning blue/black just like cornstarch. But it reacted differently by producing gas bubbles. So this mystery substance turned black/blue and produced gas bubbles. When we looked at our clues, we figured out that this substance, turned out to be baking powder. So we learned that baking powder turns blue/black when it reacts with iodine, and produces gas bubbles when it reacts with vinegar. Now we were left with baking soda and powdered sugar. The third mystery substance we got was powdered sugar. When we added iodine, we saw that it reacted by having a small streak of solid brown. When we added vinegar, we noticed that the vinegar dissolved the substance. Again, we glanced at our lab clues and figured out that the substance we were experimenting on was powdered sugar. So, we learned that powdered sugar reacts with iodine by turning brown, and dissolves. Now we just have baking soda to experiment with. Baking soda
