Majed Al Dhwaihi Chem 151 Lab Prelab Assignment for week 3 Chemical Separation Procedure: Separating the sample: First place a small amount of the spinach provided in the mortar‚ just enough to cover its bottom; combined with the sand provided to break down the call walls. A 1:1 mixture of hexane and acetone was determined to best solvent for this extraction. Knowing this add one mL of the pure hexane and one mL of the pure acetone to the mortar. Grind the contents until the cell walls
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recrystallization‚ gravity and suction filtration. Also the purpose of the experiment is to determine the actual‚ theoretical‚ and percent yields of product‚ and characterize the final compound by determining the number of waters of hydration by gravimetric analysis List of Observations: After adding (15 mL distilled water/5 drops of 3 M H2SO4) to ferrous ammonium sulfate hexahydrate in the 200 mL beaker‚ the solution was light green/blue After adding 25 mL of C2H2O4 to solution in beaker‚ the color
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PREPARATION OF POTASH ALUM [(K2SO4.Al2(SO4)3.24(H2O) Aim: To prepare a pure sample of potash alum. [K2SO4.Al2(SO4)3.24H2O] Principle: Potash alum is prepared by dissolving an equi molar mixture of aluminum sulphate and potassium sulphate in minimum amount of water containing a little amount of sulphuric acid and then subjecting the solution to crystallisation; octahedral crystals of potash alum separate out. Apparatus required: Beaker (100 ml) Trough Funnel Wire gauze Conical
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experiment‚ the solid has a C18 hydrocarbon bonded to it. Would a C18 hydrocarbon be a polar or nonpolar substance? Explain. C-H bonds are considered very nonpolar. For the chromatography to work‚ the cartridge would need to be nonpolar. 4. The Kool-Aid that is to be separated in this experiment consists of citric acid‚ calcium phosphate‚ salt‚ maltodextrin‚ artificial flavor‚ red #40 and blue #1 dyes. Group these as very polar‚ moderately polar‚ or
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solution? Sodium hydroxide solutions‚ especially in high concentrations‚ are toxic and corrosive. 2. (a) What buret reading should you record when the liquid level is as shown in Figure 2? In Figure 2‚ the lower meniscus lies below the 3 mL line and 4 minor gradations that signify 0.1 values. Estimating the uncertain digit to be 0.04 mL‚ the reading we record for this particular buret is 3.44 mL. (b) How will you recognize the end point of your titration? We know that that the end point of the
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density increases‚ concentration does as well. The density of a substance is something that stays constant‚ for solutions of material the density is expected to increase in direct translation to the concentration increasing. The theory surrounding this lab was to see in practice how density could be determined with displacement and then to determine whether the density does in fact increase directly with the concentration. Summary of Key Data Figure 1: From Part 1 Mass of Brass 13.2200g Initial Volume
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The data gathered and calculated in the experiment accurately portrayed the way the reactions would have taken place. The chloride analysis was a little bit off from other groups due to the fact that our AgCl was in clumps‚ creating less surface area‚ thus our product took longer to burn and may not have burned correctly compared to other groups; yet there are several experimental factors that could have caused us to have different results than other groups‚ i.e. different measurements for samples
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Isotopes and Atomic Mass It’s Vegium I. Purpose The purpose of this lab is to determine the average weights of each isotope of the “element” vegium‚ determine the relative abundance of isotopes of vegium‚ and calculate from experimental data the atomic mass of vegium. II. Apparatus Sample of vegium‚ balance‚ weighing cups III. Data Tables | |Beanium |Peaium |Cornium |Total
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Name and Course Section: Avital Gershtein‚ Section 701 Title: Aseptic Technique & culturing Microbes - Lab # 4 Purpose: The purpose of this experiment is to Learn and employ aseptic technique‚ to become familiar with basic requirements of microbial growth‚ to learn the basic forms of culture media‚ and to become familiar with methods used to control microbial growth. Bacteria Growth pattern after 24 hours Growth pattern after 48 hours L. acidophilus in liquid MRS broth No growth Amount of sediment
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Lab 4 Part 1: 10 points Assignment: Create an Internet and E-mail Acceptable Use Policy Learning Objectives and Outcomes Research and compare Internet and e-mail use policies enforced by other organizations. Create an Internet OR e-mail use policy for an organization. Assignment Requirements You are a networking intern at Richman Investments. An employee of the company used employer-owned equipment to access the Internet and check his personal Web-based e-mail account. He followed a
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