I thought distillation would remove the salt. The benzoic acid I wasn’t really sure about. B. If each step isn’t done correctly before moving on to the next step the percent for error rises. C. The sand recovery percentage being higher than the original sand percentage could take place if all the iron was not removed from the mixture.
Lab Report for Experiment # 5 Separation of a Mixture Student's Name: Brian Scully Date of Experiment: April 28, 2009 Date Report Submitted: May 2, 2009 Title: Separation of a Mixture of Solids Purpose: To become familiar with the techniques for separation of a mixture of solids. Before you read the experimental procedures, think about the experiment. You have a mixture of pure substances. How can you separate these components? If you have a mixture of tennis balls and marbles (not pure substances by the way), it would be easy to separate the mixture.
One student did not stir the mixture before decanting the water a. This error could cause the percent of sand calculated to be too high. When the mixture is stirred it allows for the sand and salt to separate away from each other enough for the salt to be dissolved and the sand to sink to the bottom. If it is not stirred correctly the salt may not fully dissolve leaving it mixed with the weight of the sand you are using to calculate the percent. b.
In other words, it would lead to false rejects for Telecom services while signaling false accepts for the Product and Systems group. Therefore it is suggested that different hurdle should be used based on the specific amount of risk. But it is improbable to accurately estimate beta for each projects, we need to find hurdle rates for projects with similar risks. In the case of Teletech, the telecomuncitions industry is less risky with lower return and computer and telecommunications products and services segment by contrast is more risky with higher
Unlike the mean, sample medians do not fall into a normal distribution, because medians do not use all of the available information in the sample. The main weakness of a nonparametric test is that it may have less power than the equivalent parametric test. 3). Why do you use the chi-square statistic? What type of data is used with chi-square analysis?
Of course the saturated solutions take time this experiment is done in a two day lab setting part one should be completed during the first day and ready for use on day two. Remember because Le Châtelier’s principle if you don’t filter the solution will rise. The removal of OH- from the UN filtered solution will cause more Ca(OH)2 to be dissolved for the equilibrium to restore. The second part of this lab takes knowledge from past experiments done in this laboratory. Using the Primary method used to standardize the concentration of HCl, this will bring much lower percent error in the Ksp For this standardization sodium carbonate should be used for determining the amount of hydroxide in the solution.
Explain the circumstances of the LTCM’s collapse, and why the strategies presented in part a) failed. The strategies mentioned before could only generate tiny profits. Because after all the biases between similar bonds or derivative instruments are small, the profit made from their convergence is also small. Therefore leverage has to be used to create attractive returns. The risk control of LTCM’s was set to the volatility of an unleveraged position in U.S. equities.
Sea Salt vs. Catecholase Introduction This experiment was done to explore the hypothesis: “Salt will decrease the efficiency of the catecholase enzyme, in the catechol and catecholase solution, resulting in a smaller amount of light being absorbed.” Through a biology lecture on enzymes and the process of denaturing with pH, heat and salt, one of our team members, posed the question; “Would different types of salt (such as sea salt ) change the rate of enzymatic activity, in terms of denaturing?" Professor Crowell-Murray explained that “sea salt doesn't contain iodine and is processed differently than iodized table salt”, therefore she wasn't sure if sea salt would change the rate at which enzymes work. She was intrigued by the question and said that if possible, “it was something that should be experimented." She stressed her interest in obtaining the results of such an experiment. It was also stated by Professor Bob Prior that “it is possible for salt to hurt an enzyme due to the fact that salt can change the polarity of certain parts of an enzyme.” Over time, salt tends to denature certain enzymes, making them less efficient catalysts.
Experimental Data: The original weight of the mixture before separation was 4.6g. After separation the weights were as follows Grams Percent of mixture Iron Filings 1.4g 33% Sand 1.2g 28% Table Salt 0.8g 18% Benzoic acid 0.9g 21% TOTAL 4.3g 100% IV. Observations: The easiest part of this experiment was separating out the iron filings. With the magnet they separated out pretty easily. When almost boiling the sand, salt, and benzoic acid it didn’t seem like it was working.
Introduction: In lab 3, I will learn how to separate the mixtures of solids and get comfortable with the different techniques of separating the solids. Because the solids have a different chemical makeup, different techniques will be used to separate them. I will be using the four different solids: sodium chloride, benzoic acid, silicon dioxide, and iron and follow the directions in order to separate each solid according to their differences in chemical makeup. Material and Methods: The essentials to this lab will be distilled water, crushed ice for the ice bath, one 100 mL LabPaq glass beaker, burner fuel and stand, cylinder, funnel safety goggles, digital scale, magnet bar, and the mixtures of solids. In order to remove the iron filings I will use the iron bar since it the composition of iron will be picked up by the magnet.