Observations of Chemical Changes

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Experiment 1: Observations of Chemical Changes Name: Matthew Neely Date of Experiment: 06-25-14 Location: My apartment Course Number: CHE112 Abstract: In this experiment the objective was to observe the macroscopic properties of chemical reactions and to associate these reactions with household products. With the mixing of the provided chemicals we will learn to interpret microscopic changes in terms of the behavior of atoms and molecules (Lab Manuel, pg.14). Experiment and Observations: To begin the experiment I obtained the 96-well plate to place each instructed combination of chemical in. Also needed for the experiment was a dark and light piece of paper to place behind the 96-well plate during the observation period of each reaction. Once the chemicals had been organized I then place 2 drops of the first chemical and 2 drops of the second chemical into the allotted well. Once 2 drops of each chemical were placed in the well I stirred the mixture with a toothpick and observed the mixture. The observations of the various combinations were then noted. The following combinations took place in the experiment. NaHCO3 (sodium bicarbonate - baking soda) and HCl (hydrochloric acid). The bubbles formed are carbon dioxide. HCl (hydrochloric acid) and BTB (bromothymol blue). Bromothymol blue is one of many acid-base indicators. What color do you observe? NH3 (ammonia, a base) and 1 drop of BTB (bromothymol blue). What color do you observe? Record the colors you expect when BTB reacts with an acid and with a base. HCI and blue dye. Blue dye and NaOCl (sodium hypochlorite). Observe, then add 1 drop of HCl. KI (potassium iodide) and Pb(NO3)2 (lead nitrate). Describe the precipitate formed. NaOH (sodium hydroxide - a base) and phenolphthalein. Phenolphthalein is

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