a. Oil hypothesis = Oil has little ability to contaminate ground water. b. Vinegar hypothesis = Vinegar has little ability to contaminate ground water. c. Laundry detergent hypothesis = Laundry detergent has a great ability to contaminate ground water. 2.
Lab 2 – Water Quality and Contamination Experiment 1: Effects of Groundwater Contamination Table 1: Water Observations (Smell, Color, Etc.) Beaker Observations 1 The water was colorless with a slight smell of chlorine. 2 The water has a slight yellow tint to it. It also appeared to be oily and then it surfaced to the top showing that there is two levels with water more dense than vegetable oil . 3 The vinegar has a stronger scent than the water and appeared to have a slight change in color but not too noticeable.
Zinc ion and Iodine-iodide-triodide ion in water: It was a liquid solution in a bottle, it was very dark orange-brown color. Solid Zinc Iodide: A very white powdery substance that had several clumps within it. It was also very dry in nature. Mass Table Substance Amount of Mass Measured for Actual Mass Granular Zinc 2.0 grams 1.9 grams Iodine Crystals 2.0 grams 2.1 grams Observation of Reaction Shown below and Included within the lab notes on pages 12 and on page 14. Placing Acetic Acid in Zinc and Iodine test tube After placing the Acetic Acid in a normally unreactive test tube containing Zinc and Iodine, the solution changed to a more orange and then to a more red-brown color.
SCI 207 NEW WEEK 2 LAB 2 WATER QUALITY AND CONTAMINATION http://www.homeworkproviders.com/shop/sci-207-new-week-2-lab-2-water-quality-and-contamination/ Lab 2 – Experiment 1: Effects of Groundwater Contamination Table 1: Water Observations (Smell, Color, Etc.) Beaker Observations 1 To me this is just water, there is no smell. 2 As you pour the oil in the water the oil started to bubble at the top. When stirring the oil turned into smaller bubbles. It looks as if the oil has placed a thick line of film on the water 3 After pouring the vinegar in the water the only change I noticed was that the water seemed to be a shade darker when added it.
6. Zinc Sheet: a rectangular, thin, sheet like metal, gray/silver. 6 5 4 3 2 1 * Solubility of solid iodine; 1. Solid iodine in 1 mL of water is slightly soluble, because the solution turns into a light brown/yellow color. However majority of the solid Iodine was left at the bottom of the test tube; which leads to the conclusion that it’s not reactive on water.
Reactant B- Sodium Chromate(aq)~Na2CrO4 Sodium Chromate is an odorless yellow crystalline powder. It melts at 1457.6oF, has a molar mass of 162g/mol, and a density of 2.7g/cm3. It is soluble in water and slightly soluble in ethanol. Sodium Chromate shouldn’t be inhaled, ingested, or touched (absorbed through skin) as it is toxic and can be fatal. It is not combustible, but it speeds up the combustion of other substances because it is an oxidizing agent.
Lab 2: Water Quality and Contamination Name SCI 207 Instructor Date Lab 2 - Experiment 1: Effects of Groundwater Contamination |Table 1: Water Observations (Smell, Color, Etc.) | |Beaker |Observations | |1 |To me this is just water, there is no smell. | |2 |As you pour the oil in the water the oil started to bubble at the top.| |
| The sugar will start to become hard again at room temperature. | Sodium Carbonate and Hydrochloric acid | The sodium carbonate is a white powder and is not in crystal form. The hydrochloric acid is a clear non-viscous liquid. | The mixture will start to bubble vigorously and release a gas. | Most of the mixture will evaporate leaving only a small amount in the test tube.
As it rises, it cools, making it denser and therefore heavier, so it sinks. This all happens in slow motion because heat absorption and dissipation are fairly slow processes, and the density changes we are discussing here are very slight. To create the floating blobs, the two compounds in a motion lamp must be immiscible, or mutually insoluble. All this means is that liquid A doesn't dissolve in liquid B -- the two don't mix, so you see two separate liquids, one floating on top of or within the other. The classic example of immiscible compounds is oil and water.
6. Clean up! Do NOT put any solution into sink or garbage. Data Collection: Mass of empty beaker: | 163.49 g | Mass of beaker & hydrated copper (II) sulphate | 166.5 g | Mass of beaker & anhydrous copper(II) sulphate | 165.65 g | Analysis: Conclusion: This lab brought forth many potential sources of error, preventing a completely accurate or precise final result. When using the glass rod to stir the powder, much of the powder was transferred onto the rod and therefore mass was lost.