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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
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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