mp4p3Group+6



**__ Background Information __** Bromothymal Blue - Changes color when a chemical reaction occurs

NaHCO3 - Baking Soda is used for cooking where it makes bread rise. Also, Baking soda can be used to remove stains from clothing.

CaCI2 - Calcium Chloride is used as a food preservative and is more healthy than many other preservatives.

H20 - Water is used for many things like drinking or washing a car. The elements used in water are Hydrogen and Oxygen. **__ Predictions __** BB+NaHCO3 - Our group thought that the combining of these two chemicals would creates a Color change, and the temperature will increase.

BB+CaCI2- Our group thought that when we would combine these two chemicals that a Color change would occur, and a odor would be formed. CaCI2+NaHCO3- Our group thought that when we would combine these two chemicals a odor would form, and the temperature will decrease. CaCI2+H2O- Our group thought that when we would combine these two chemicals that a Color change would occur.

NaHCO3+H2O- Our group also thought that there would be a Color Change for this combination.

H2O+NaHCO3+CaCI2- Our group thought that when we would mix these chemicals that a Color change would occur, a odor would form, and fizzing along with gas bubbles. CaCI2+NaHCO3+BB- Our group thought that when we would combine these three chemicals that their would be a Color change, fizzing, and a odor.

Our group thought all of the chemicals and experiments would have chemical reactions with each other. **__ Experimental Design __** Question - What are signs that a chemical reaction is taking place?

Hypothesis - If the chemical changes color it is going through a chemical reaction.

Independent Variable - combination of chemicals in the test tube.

Dependent Variabl e - signs of chemical reaction.

Chemicals - water (H2O), Calcium chloride, Bromothymal Blue, Sodium Bicarbonate

Constants - test tubes, water, and the same chemicals are used through out. Combination of Chemicals in the Test Tubes
 * = Chemicals ||= Water ||= CaCI2 ||= NaHCO3 ||= BB ||
 * = Level ||=  ||=   ||=   ||=   ||
 * = Repeated trials ||=  ||=   ||=   ||=   ||

__** Pictures of Our Experiments **__



Mixing bromothymol blue with baking soda and water



Jake puttin bromothymol blue into graduated cylinder __// Conclusion //__ There is no conclusion based on the first experiment because nothing happened. In the second experiment the temperature increased, the new chemical became opaque, it started fizzing, and gas bubbles formed. The fizzing and bubbles occurred because a gas formed. The temperature increased because the molecules bounced and moved faster which increased the temperature. There is no conclusion for experiment three because nothing happened. In experiment four the new chemical became opaque, and the temperature rose. It became opaque because the chemicals did not settle out with each other which made it become thick and none see through. The temperature rose because the molecules moved faster and spread out. In experiment five the same results occurred. In experiment six NaHCO3 dissolved into the water and the temperature went down. This happened because the two chemicals settled out with each other. The temperature went down because the molecules slowed down. In experiment seven the color changed, there was fizz and gas bubbles, and the temperature stayed the same. The color changed because the properties of one of the chemicals changed. The fizz and bubbles occurred because a gas was formed. Furthermore, this is why all of the experiments got the results that had.