Types of Chemical Reaction - Types of Chemical Reaction...

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Unformatted text preview: Types of Chemical Reaction Materials ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● Goggles Lab Apron Bunsen Burner Crucible Tongs Watch glass 7 test tubes Test­tube rack Test­tube holder Dropper or Beral pipet Wood Splints Metal scoopula Glass Plate/Slide Graduated Cylinder (10 mL) Magnesium ribbon, Mg (2­cm strips) 3.0 M HCl (hydrochloric acid) 3% hydrogen peroxide, H​ O​ 2​ 2 Ammonium carbonate, (NH​ )​ CO​ (s) 4​ 2​ 3​ Cobalt chloride test paper 0.1 M KL (potassium iodide) 0.1 M Pb(NO3)2 (lead (II) nitrate) Aluminum foil, Al 1.0 M CuSO​ , (copper (II) sulfate) 4​ 1.0 M NaOH (sodium hydroxide) Phenolphthalein CuCO​ (s), copper(II) carbonate 3​ MnO​ (s), manganese dioxide 2​ Procedures 1. We first put on our goggles and lab apron before we began the lab. 2. We then used a crucible tong to hold a 2 cm strip of Mg ribbon in the hottest part of the burner flame. 3. After that, we placed a test tube in the test­tube rack. And we had a second test tube ready in the test tube rack. We added 5­10 mL of 3.0M HCl to the first test tube. Then dropped a 2­cm piece of Mg ribbon into the acid. Held the second test tube over the mouth of the first test tube. When the reaction appeared to have ended, we lighted a wood splint and quickly tested the collected gas by holding the burning splint near the mouth of the second test tube. 4. We placed approximately 5 mL of hydrogen peroxide, H2O2, into a test tube. We had wooden splint and matches ready. Added a very small amount (about the tip of the scoopula) of manganese (IV) dioxide, MnO2, to the hydrogen peroxide. As the reaction occurred, lighted the splint and allowed it to burn freely for 5 seconds. Blew the flame out and placed the glowing splint halfway into the test tube. 5. We carefully placed about one scoopula of ammonium carbonate, (NH4)2CO3, into a test tube. We Held the test tube with a test­tube holder, and heated the solid gently by holding the test tube in the flame for a few seconds, then removed it for a few seconds. Continued heating in this manner for 1 minute. As we heated the solid, we gently wafted toward our nose to detect any odor. Continued to heat the solid and placed a burning splint at the mouth of the test tube. Continued to heat the solid and placed a piece of blue cobalt chloride test paper just inside the mouth of the test tube. 6. We placed a drop of potassium iodide solution, KI, on a glass plate. We added a drop of lead (II) nitrate solution, Pb(NO3) 2. 7. Finally, we placed a piece of aluminum foil in a test tube and add approximately 3 mL of 1.0 M CuSO4. Observed the changes with the aluminum and the solution. We noted any temperature change. As we conducted each of the investigation in the data table we recorded our observation or the reaction taking place in the data table. Variables, Controls, and Constant Independent Variable​ : Dependent Variable​ : Type and products of chemical reaction Control: Constant: OBSERVATIONS Proce dure Dem o 2 Data Table Reaction Observations Reaction Type Balanced Equation NaOH and HCl Burning Mg sodium hydroxide + Double phenolphthalein = displacement pink after putting HCl it turns clear, boils and evaporates white light, ashes combustion NaOH + HCl ​ →​ NaCl + H​ O 2​ 2Mg + O​ ​ →​ 2MgO 2​ 3 4 5 6 7 Mg and HCl when we put the Mg into HCl, it started bubbling then when we put in the lightened splint, it made a pop + squeak MnO2 in the H​ O​ , with peroxide turned 2​ 2 ​ MnO​ black, started 2 smoking and bubbling; As we kept putting in the splint, it kept catching on fire Has a strong pungent Heating smell, test paper (NH​ )​ CO​ turned pink at the 4​2​ 3 end and the splint got burned When we mixed KI KI and and Pb(NO3)2 the Pb(NO​ )​ product was a yellow 3​ 2 liquid Aluminum turned Al and brown and went into CuSO​ pieces, liquid turned 4 from dark blue to light blue and the copper fell out single displacement Mg + 2HCl ​ →​ MgCl​ + H​ 2​ 2 Decomposition 2H​ O​ →​ 2H​ O + O​ (g) 2​ 2 ​ 2​ 2​ decomposition (NH​ )​ CO​ →​ CO​ + H​ O + 2NH​ 4​ 2​ 3 ​ 2​ 2​ 4 double displacement 2KI + Pb(NO​ )​ → PbI​ + 2KNO​ 3​ 2 ​ 2​ 3 single displacement 2Al + 3CuSO​ →​ 3Cu + Al​ (SO​ )​ 4 ​ 2​ 4​ 3 ...
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