Warning do not look directly at the burning magnesium

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Unformatted text preview: t color the mixture of the two should be if no reaction were to occur. (Your professor might be kind enough to show a mixture of a hydrocarbon that will not react with bromine as an example) Your brave and illustrious professor will add some of the bromine to the cyclohexene in the fume hood. Take observations. Did a chemical reaction occur? Dakota State University Page 63 of 232 Experiment 3: Chemical Reactions General Chemistry I and II Lab Manual 2. Magnesium (Mg) and Oxygen (O 2 ) Get crucible tongs (NOT coated with rubber) and a watch glass ready. Light a Bunsen burner. Take observations on a SMALL piece of magnesium. Holding the magnesium with the tongs, ignite the magnesium in the flame. WARNING! Do NOT look directly at the burning magnesium! Once the reaction is complete, put the burnt magnesium into the watch glass and allow it to cool a few minutes. Take careful observations on the product. 3. Anhydrous Copper (II) Sulfate (CuSO4 ) and Water Put a SMALL AMOUNT (about the size of a pea) of anhydrous copper (II) sulfate into a small test tube. Take careful observations on it. Add one drop of water to the copper (II) sulfate (just enough to wet it; not enough to cover it completely). Take observations on the final product. Decomposition Reactions: 1. Sucrose DEMONSTRATION ONLY In the fume hood, you will see table sugar (C 6 H12O6 , also known as “sucrose”) and concentrated sulfuric acid (H2 SO4 ). Carefully take observations regarding these two reagents. Your poor underpaid and greatly misunderstood professor will pour sulfuric acid onto standard table sugar. Take careful observations as the reaction occurs. What is the “smoke” that is given off? (HINTS! First of all, sugars are often referred to as “carbohydrates”, because they all have the formula Cn (H2 O)n and sulfuric acid is a dehydrating agent.) What is the product left behind? Balance the equation. 2. Hydrogen Peroxide Take a SMALL AMOUNT of hydrogen peroxide (about half a milliliter) and put it into a SMALL test tube. Take careful observations. Be sure yo u have a glowing splint handy and a lit Bunsen burner nearby (to light the glowing splint). Add a SMALL AMOUNT of Manganese Dioxide (a catalyst). Quickly ignite and extinguish your glowing splint and test the gas given off. What is the gas? Balance the equation. Dakota State University Page 64 of 232 Experiment 3: Chemical Reactions General Chemistry I and II Lab Manual 3. Sodium Bicarbonate (baking soda) Take a small amount of sodium bicarbonate and put it into two test tubes distributed approximately equally. Vigorously heat one of the two test tubes for several minutes and note any observations. During the heating, test for gases released using the glowing splint test. Allow the test tube to cool. When the heated test tube is cool, add about half a milliliter of water to both the heated and the unheated test tubes. Test the pH of both test tubes using pHydrion paper. There were two gases released in this reaction; what do you...
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This note was uploaded on 09/18/2012 for the course CHEMISTRY 1010 taught by Professor Kumar during the Fall '11 term at WPI.

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