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.
The final crude product yield was 0.91g and the pure product yield was 0.36g. Error may have occurred during the extraction phase. Although I extracted twice with Sodium Chloride, if waste was not completely removed, it would affect the purity of the product. The distillation process may have also affected the pure product. The lab manual recommended that 0.5mL of waste be removed during distillation; otherwise it would affect the purity of the product.
The water can be removed via heat and we are left with a white solid, Zinc Iodide sold. 2. The physical and chemical properties for some were the same and for some it was different. The color of the Zinc Iodide is different (white, while Iodine is gray and Zinc is silvery), while ZnI2 is as odorless as Zn is (I2 has a pungent odor). ZnI2 does not react chemically with mineral oil the same way I2 does (no purple color
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.
At Honeywell, we do a great deal of testing and research. All of it is focused on life safety. We must ensure the research is honest and above board. We have many steps and approvals for all products, which should ensure that all safety equipment that is released to the public is a great asset and not a deterrent to living safe lives. We use our own safety equipment in protecting our facility and our employees, so people who work there are testing products that may save their own life one day.
Redox Arena Lab Report Part 1 Observations of Standards Shown below and Included within the lab notes on page 11. Iodine Crystals: It was very small, round, and grey substance. Granular Zinc: It was a silver, small, grain shaped substance. It was also very hard and was slightly lustrous. Zinc ion and Iodine-iodide-triodide ion in water: It was a liquid solution in a bottle, it was very dark orange-brown color.
Procedure: • Lab area was set up within a safe designated area for work. • Testing wells were prepped as well as all other materials that would be used in this experiment. • Tested the reaction of each specific chemical/compound with Clorox Bleach. • Closely monitored and recorded data for each reaction. • Created Data Table using the recorded information from each test.
| 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.
Because we didn’t count the proper number of significant figures in the volume we had too many when we went to calculate the density. Conclusion: In this experiment we were supposed to be able to identify unknown substances using physical properties. We were successful in understanding how the use of physical properties better helps when identifying various unknown substances. Because of this experiment I learned how to take weight calculate volume density solubility and specific gravity. We were able to determine that the unknown substance was methyl by using its boiling point and other physical characteristics.
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.