Tuesday, September 27, 2011

Chemistry in a bag!

I worked Brandon, we took one spoon full of the Calcium chloride, and one of the Sodium bicarbonate or known as baking soda. With one pipette of phenol red solution and one pipette of water and mixed it in a zip lock baggy together. We actually had to do the experiment twice because when you put the substances in the baggy your supposed to separate it until your ready to mix it together. then shake the baggy to mix. but we didn't mix it well enough the first time so it didn't produce the gas it was supposed to. So we did it all again and shook the baggy for about 5 minutes. and as we were shaking the chemicals started to react and the temperature of the baggy went from hot to cold. Then it filled with chemical gas. and the baggy popped. Now what we have to do is test what made the chemical reaction. First we tested the phenol red with the baking soda nothing happened we got a thick pink liquid. The second thing we tested was the phenol red with calcium chloride, the baggy hot really hot but there was no pressure being produced. We wafted it and it had a rubbing alcohol smell. The third thing we tested was phenol red with Calcium chloride and the baking soda the Contents turned yellow and the pressure/gas was produced. W wafted it again and has the same smell as the phenol red and calcium chloride. Then we tested the calcium chloride with water and do the same with the baking soda and water. Nothing happened to either of them there was no pressure/gas produce just with the calcium chloride the temperature changed just like it did with the phenol red. The last thing we have to test is the calcium chloride, baking soda, and water all in one baggy to see if we get the same reaction as you would when we substituted the Water for phenol red. We are going to see if awe get the same amount of pressure. After testing, we found out that the the phenol red with the calcium chloride is what makes the smell, but when you put the baking soda and calcium chloride with any liquid that's what produces the pressure/gas because what happened when we did the last test was we got the gas just no smell it bubbled a little but more than any other time but that and the smell are the only thing that changed.
1. The calcium chloride with either liquids produced temp change.
2. Yes, the temperature turned very cold. It wasn't anywhere near room temperature.
3. The phenol red with just one if the substances turned pink. But when you but both substances with the phenol red then it changed yellow.
4. No, when we put just phenol red and baking soda there was no bubbling just turned color. But when you put it with the calcium chloride the bubbling and color changed happened at the same time but because we were shaking the bag at the same time.
5. We found out that when you put the baking soda with the calcium chloride with either liquids a reaction does occur, the gas was still produced.
6. The bubbling and the smell change, I think that the phenol red and calcium chloride are the ones that make up the new substance.
7. change the liquid that the calcium chloride is mixed with.
8. i believe that a temperature change is always and indication of a chemical reaction has and is occurring.

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