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What are some signs of chemical reactions that are taking place? Hypothesis: New substances might be formed, colors will change, and temperature will increase or decrease. Independent variable: We are testing different combinations of chemicals in the test tube. Dependent variables: Finding signs of chemical reactions.

Chemicals: Calcium chloride- CaCl2 Sodium bicarbonate- NaHCO3 Bromothymal Blue- C27H27O5SBr2Na Water- H2O =**Summary**= All of the mixtures did not undergo chemical reactions.The reactions that occured were not large reactions either. In some there were color change, some bubbling, and gas formed. There were no odar changes. Bromothymal blue had a chemical change with Calcium chloride and sodium bicarbonate. This created a yellowish color in the mixture, therefore there was a chemical change in this mixture. Calcium Chloride with water formed a gas/bubbles. Also in all of the mixtures and compounds there were temperature changes. Usually they all rose, but in sodium bicarbonate with bromothymal blue there was a decrease in temperature by .4 degrees celcius.













Predictions: Water + Baking Soda = We thought it was not going to do anything but dissolve Water + Calcium Chlorine= We thought bubbles would occur BB + Baking Soda= We thought it was going to change color BB + Calcium Chlorine= We thought it was going to change color and also form bubbles Calcium Chlorine + Baking Soda= We thought it was going to do nothing

__Background Information:__ __Water-__ It's chemical symbol is H2O. When a solid, colored white, almost colorless, neutral but more a base. __Sodium Bicarbonate-__ It's chemical symbol NaHCO3. Has 3 oxygen atoms and is usually used in cooking (also called baking soda). __Calcium Chloride:__ It's chemical symbol is CaCl2. This compound is an irritant. Bad to get on skin because it can cause a burning sensation. __Bromothymal Blue:__ It's chemical symbol is C27H27O5SBr2Na. In an acidic solution. Will turn the color yellow in a chemical reaction.


 * Lab Group || Mass of the Glassware || Mass of the Reactants Plus Glassware || Mass of the Reactants Alone || Mass of the Products plus Glassware || Mass of the Products Alone || Change in Mass ||
 * 1 || 90.5 || 95.1 || 4.6 || 95.1 || 4.6 || 0 ||
 * 2 || 96.1 || 98.2 || 2.1 || 98.2 || 2.1 || 0 ||
 * 3 || 80.2 || 87.2 || 7 || 87.2 || 7 || 0 ||
 * 4 || 81.7 || 86.8 || 5.1 || 87.2 || 5.1 || 0 ||
 * 5 || 74.2 || 76.4 || 2.2 || 74.2 || 2.2 || 0 ||
 * 6 || 92.9 || 96.8 || 3.9 || 96.8 || 2.2 || 0 ||
 * 7 || 88.5 || 93.1 || 4.6 || 93.1 || 4.6 || 0 ||

Conclusion: By Matt, Tim, Mark, and Bobby: We concluded that different things together react in different ways like water and baking soda changing color and also increasing in temperature but the Bromothymal blue only changed temperature by a little. Also we have concluded that in all of our mixtures there were no odor changes. Therefore these mixtures do not perform everything they could have such as, precipitates, and odor changes. In addition, we concluded that some reactions bubbled and changed in temperature and so we could see that the reaction under went a chemical reaction. all of these changes prove our hypothesis to be correct because through reactions they had, color change, temperature change, and gases were formed.

Observations: When we mixed the two clear liquids together it turned to a solid yellow color and the mass did not change. When we put the yellow liquid in the filter the yellow stayed on the paper and the liquid went through and made it clear again, this means that it did not disolve ithe liquid.