Yield

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  • 4-Dihydropyridine Synthesis Lab Report

    wt. aqueous formaldehyde were added to a 10 mL round bottom flask and allowed to heat to 80°C with constant stirring. After 10 minutes, a solid and wet product was formed. Vacuum filtration was then used to filter the product. Recrystallization methods were then completed using 95% ethanol in order to isolate the pure product. This product had a yellow color to it. 1) A. The detailed mechanism for 1,4-dihydropyridine formation is included in the hand written portion of the lab report. B. In this lab, .23 grams of product were obtained with a percent yield of 23.9%. In the previous reported synthesis: Norcross, B. E.; Clement, G.; Weinstein M. J. Chem. Educ. 1969, 46, 694-695, it was stated that typical yields are in the range of 4-6 grams. The difference in chemical yield is due to various quantities of aqueous ammonia. Furthermore, the heating period can also affect the yield with increased time relating to increased yield. C. The melting point that was taken in lab was 172°C – 177°C. In the Norcross, B. E.; Clement, G.; Weinstein M. J. Chem. Educ. 1969, 46, 694-695 article it was stated that the melting point range was 183°C-184 °C. This value is very close to the value obtained in lab and could be different due to the product not being completely dry. In the literature (Roomi, M.W. J. Med. Chem. 1975, 18, 457-460 (dimethyl derivative) the melting point of the ethyl compound was found to have a range of 178°C -161°C. This value is also very close to the experimental…

    Words: 734 - Pages: 3
  • Immortalization Of Pompeii Essay

    Over the centuries, the city was abandoned and forgotten as the memory of Pompeii became nothing but a legend passed throughout generations by word of mouth. Despite the fact that the ancient objects from Pompeii were discovered sporadically, the city itself was not found until the 18th century. Ever since, excavations have gone deeper into the city’s mysterious secrets. Archaeological finds reveal how people lived during that time, as well as how they died during the…

    Words: 1135 - Pages: 5
  • Gravimetric Analysis Colourimetry

    method to practice when calculating the percentage yield of a reaction. When examining the data obtained from the investigation, there was evident that there were some trends in the results. For the three graphs showcasing the results for gravimetric analysis in task one and task two, there was no general pattern. This was due to the fact that in Graph 1, the actual yield was a portion larger than the theoretical yield, while in Graph 3, the opposite results were obtained and in Graph 4, the…

    Words: 1772 - Pages: 8
  • Copper II Phosphate Trihydrate Lab Report

    experiment was to precipitate Copper (II) Phosphate Trihydrate and determine percent yield, also to react an aqueous solution of Copper (II) Chloride with aqueous Sodium Phosphate and describe the reaction. Procedure: To conduct our experiment 10 milliliters of CuCL2 and 8 milliliters NaPO4 was added to its own 50 milliliter beaker. These solutions were then combined in a 150 milliliter beaker and mixed for 1 minute. The PH of the mixed solution was checked to see if it was accurate enough to…

    Words: 779 - Pages: 4
  • Negative Impacts Of Climate Change On The Rice Supply Chain

    study is to gain in-depth understanding of the real world behavior through documentations such as historical data, observations and artifacts (Merriam, 1998). Again, according to Sterman (2001) and Saeed (1992), empirical evidence such as historical data and observations can provide guidelines to reproduce the feedback structure as a reliable representation of the real world. 3.2 Data gathering Table 3.1 shows climatic and non-climatic data collected from relevant institutions. Climatic and…

    Words: 1220 - Pages: 5
  • Zinc Iodine Experiment

    Result 1 1. In trial 1, the mass of zinc iodide was 2.51 grams. 2. Although, the consumed moles and mass of zinc consumed could not be calculated due to an accident during lab, the mass of iodine consumed was 2.0 grams and moles consumed was 0.0079 moles. The theoretical yield for the zinc iodide was 2.51 grams and 2.51 grams was produced which makes the actual or experimental yield 100%. 3. The possible errors could have occurred due to human error in calculations or mis-calculations in the…

    Words: 830 - Pages: 4
  • Fallacy In Frankenstein

         One who has only seen the Hollywood version of Mary Shelley's Frankenstein would assume that in the course of the book the true monster is Dr. Frankenstein himself. But upon analysis of the text it becomes clear that it is in fact the Monster who is the greater of the two evils. Although created by the doctor, his own hatred and consciousness yield an evil larger than even the doctor could have predicted.      The monster himself, like Dr.…

    Words: 800 - Pages: 4
  • Aldol Condensation Synthesis

    much further away from the double bonded O where the surrounding phenyls can have a much stronger effect than the distant C=O can. The theoretical yield of the product was found to be 0.550g while the actual yield was 0.277g. This produces a percent yield of 50.4%. The reaction was hindered by multiple experimental errors that also may have contributed to the incorrect wavelength discussed above. When the KOH was added to the ethanol and crushed, the solution turned brown which is not part…

    Words: 1096 - Pages: 5
  • Community Garden Essay

    raised soil beds will need to be constructed. Moreover, litter and pollution from surrounding urban surfaces must be closely monitored and mitigated to ensure healthy plant growth. Location 5: Phelps Hall roof (on-campus) 3 rectangles: (69ft x 250ft) + (70ft x 190ft) + (100ft x 260ft) = 56,550 sq ft (56,550 sq ft) x (1 acre)/(43,560 sq ft) x (1 hectare)/(2.47105 acre) = 0.5254 ha Shading from tall trees and raised portions of the roof structure of Phelps Hall will constrain plant growth on the…

    Words: 1601 - Pages: 7
  • Yield Management In Golf Industry

    Yield Management in the Golf Industry Revenue management has been addressed in many areas such as airlines and hotels to address problems in their timing and planning of pricing and overall yield management. So why hasn’t this similar practice come to the golf industry? The golf industry has a lot of similarities to the hotel and airline operations and should start to apply some of their yield management techniques to their everyday operations. First we will want to look at what exactly…

    Words: 1365 - Pages: 6
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