p1g1+mp4

The Awesome Group __Chemical Reaction Lab:__  __Question: What are some signs that a chemical reaction is taking place?__  __ Background Information __  Sodium Bicarbonate: NaHCO3   -white solid   -also called baking soda   -non toxic   Water: H2O   -non toxic   -clear liquid   Calcium Chloride: CaCl2   -ice control   -dust control   -using in drying tubes   -toxic  -burns when touches skin Bromothymol Blue: C27H28Br2O5S -chemical indicator -used to show the process of photosynthesis -turns acidic solutions yellow IV: Combination of chemicals in the test tube. DV: Signs of a chemical reaction Constants: .5 grams of each substance, 15mL of liquid
 * Chemical || Prediction || Color before || Color after || Temperature before || Temperature after || Precipitate || Gas bubbles ||
 * CaCl2 + H2O || dissolves in the water || Clear || Foggy || 19.3 || 22.7 || No || Yes ||
 * NaHCO3 + H2O || produces a gas and produces bubbles || Clear || Clear || 20.4 || 18.3 || No || No ||
 * BB + CaCl2 || turns yellow || Blue || Green +blue || 19.8 || 24.3 || No || Yes ||
 * NaHCO3 +CaCl2 || gas is released || White || White || 19.5 || 20.4 || No || No ||
 * NaHCO3 + BB || stays blue || Blue || Blue || 20.5 || 18.4 || No || No ||
 * CaCl2 +H2O +NaHCO3 || gas is released || Clear || White || 19.4 || 19.7 || Yes || Yes ||
 * CaCl2 + BB + NaHCO3 || turns green || Blue || White + yellow + green + blue || 19.5 || 19.7 || No || Yes ||

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**Conclusion**- When we mixed 7 combinations of the chemicals sodium bicarbonate, calcium chloride, bromothymol blue, and water. In some of these combinations, multiple signs of chemical reactions were present, while in others, no signs of chemical reactions formed. These signs of chemical reactions are present because of the rearangement of atoms in the chemicals. Their atom's chemical bonds were broken and then transformed to create a new compound.

Summary- We tested seven different chemical combination. They were the ones listed in the table above. All most all of the chemicals we tested either changed with a gas, an odor, or a precipitate formed. For solids we used .5g and for liquids we used 15ml. When we mixed the chemicals some produced a gas and some had an odor. Only of the chemicals that we mixed, calcium chloride+Sodium Bycarbonate+water, produced a precipitate.

Conservation of Mass Lab Background Info __Lead Nitrate:__ Chemical Formula: Pb(NO3)2 Colorless crystal or white powder Soluble in water Toxic Lead to lead poisoning if ingested

__Sodium Iodide:__ Chemical Formula: NaI White, crystalline salt Reaction Detectant Odorless Soluble in water irritant Prediction: We predicted that the mass of the reactants and the mass of the products would be the same due to the Law of Conservation of Mass.

Experimental Design: Question: How does the mass of the reactants compare to the mass of the products in a chemical reaction when a precipitate is formed. Hypothesis: It will be the same because of the law of conservation of mass. IV: The mass of the reactants DV: Mass of the Products Procedures:First we measured the mass of the glassware using a triple beam balance with nothing in it. Next we measured the mass of the reactants in the glassware before the chemical reaction. We then found the mass of the reactants alone by subtracting the mass of the glassware from the mass of the reactants with the glassware. Then we measured the mass of the products and glassware after the reaction, and found that the mass of the products and the mass of the reactants were the same, which confirmed our predictions.
 * Lab Group || Mass of the Glassware || Mass of the Reactants + Glassware || Mass of the Reactants Alone || Mass of the Products + Glassware || Mass of the Products Alone || Change in Mass ||
 * 1 || 94.2 || 99.2 || 5.0 || 99.1 || 4.9 || -.1 ||
 * 2 || 95.5 || 99.5 || 4.0 || 99.5 || 4.0 || 0 ||
 * 3 || 80.1 || 84.4 || 4.3 || 84.5 || 4.4 || +.1 ||
 * 4 || 82.2 || 86.4 || 4.2 || 86.4 || 4.2 || 0 ||
 * 5 || 74.4 || 79.0 || 4.6 || 79.0 || 4.6 || 0 ||
 * 6 || 92.9 || 96.9 || 4.0 || 96.7 || 3.8 || -.2 ||
 * 7 || 88.3 || 92.0 || 3.7 || 92.0 || 3.7 || 0 ||

Observations: When the two substances were mixed together, the solution turned yellow right away. The reaction formed sodium nitrate and lead iodide. The mass of the reactants and products stayed the same.

Equation: Pb(No3)2+2NaI=2Na(No3)+PbI2

Conclusion: After creating a chemical reaction, we noticed that the mass of the products and the mass of the reactants was equal. This is because of the law of conservation of mass. It states that you cannot create nor destroy mass. Since the reactants started at a certain mass, the mass of the products should be exactly the same, without any variables such as hand oil or an unzeroed balance.

Summary: In the lab first we we thought the mass would stay the same. We got the mass of the glassware, the chemicals, and the products of the reactants. When we mixed the chemicals they turned an oragish yellow color and the test tube became opaque. The reaction formed sodium nitrate, and lead iodide.

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