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how to write an 5 paragraph essay Hurtwood House

Please join StudyMode to read the full document. . Introduction to how to write an 5 paragraph essay Hurtwood House, preparing standardized solutions and how to write an 5 paragraph essay university of massachusetts lowell — umass lowell (navitas), making dilutions Introduction: A solution is a mixture of two or more substances uniformly dispersed through a single phase, so that the mixture has the same composition throughout. A solution may be a solid dissolved in a liquid. A solution is comprised of a solvent and a solute, where: the solvent is the liquid in which the solid dissolves (Water is the most common liquid solvent), the solute is the solid that dissolves in the aspects of critical thinking trafalgar castle school, solvent. In the example of the how to write an 5 paragraph essay Hurtwood House, salt solution given above ( sodium chloride is the solute) A solution of known concentration is called a standard solution . Its concentration is determined by a process known as standardization. When making up a standard solution it is significant that the accurate mass of how to write an 5 paragraph essay Hurtwood House substance is exactly measured. It is also important that all of this is effectively transferred to the volumetric flask used to make up the level. Preparation of standard solution by using standard substances in one of several ways. how to write an 5 paragraph essay Hurtwood House! A primary standard is a substance of how to write an 5 paragraph essay Hurtwood House known high purity which may be dissolved in a known volume of solvent to give a primary standard solution . If stoichiometry is used to establish the strength of how to write an 5 paragraph essay Hurtwood House a titrant, it is called a secondary standard solution . The term secondary standard can also be applied to a. . Freezing Point Depression in Solutions The freezing point of pure water is 0°C, but that melting point can be depressed by the adding of a solvent such as a salt. The use of ordinary salt (sodium chloride, NaCl) on how to write an 5 paragraph essay Hurtwood House, icy roads in the winter helps to melt the ice from how to write an 5 paragraph essay Hurtwood House the roads by lowering the melting point of the ice. A solution typically has a measurably lower melting point than the pure solvent. The following figures were found in a published report, but have not been checked out how to write an 5 paragraph essay Hurtwood House in detail. Critical thinking students Brighton College! A 10% salt solution was said to lower the melting point to -6°C (20°F) and critical thinking students brighton college, a 20% salt solution was said to lower it to -16°C (2°F). A more formal treatment of freezing point depression is given by Ebbing. The freezing point depression ΔTf is harvard business articles appleby college, a colligative property of the solution , and for dilute solutions is found to be proportional to the molal concentration cm of the solution : ΔTf = Kfcm Where Kf is called the freezing-point-depression constant. A pleasant application of the freezing point depression is in the making of homemade ice cream. The ice cream mix is put into a metal container which is surrounded by crushed ice. Then salt is put on the ice to lower its melting point. The melting of the solution tends to lower the equilibrium temperature of the ice/water solution to the melting point of the solution . How to write mba essays Abingdon School! This gives a temperature. . determine the unknown concentration of potassium permanganate (KMnO4) solution by finding its absorbance through the use of spectrophotometer. The preparation of four known concentration of KMnO4 was done namely, 2.00Ă—10-4M, 1.50Ă—10-4M, 1.00Ă—10-4M, 5.00Ă—10-5M, respectively and is to be place on the spectrophotometer with the how to write an 5 paragraph essay Hurtwood House, unknown and distilled water for the determination of each concentration’s absorbance. As the concentration is proportional with the absorbance of the solution , to determine the concentration of the solution is possible by drawing a graph of concentration against the absorbance. At the end of the experiment, the group found the concentration of the unknown sample is 2.50Ă—10-4M. I. Introduction Spectrophotometry is a method to measure how much a chemical substance absorbs light by measuring the intensity of light as a beam of light passes through sample solution . The basic principle is how to write an 5 paragraph essay Hurtwood House, that each compound absorbs or transmits light over how to write mba essays abingdon school, a certain range of wavelength. This measurement can also be used to measure the amount of a known chemical substance. Spectrophotometry is one of the most useful methods of quantitative analysis in various fields such as chemistry, physics, biochemistry, material and chemical engineering and clinical applications. A spectrophotometer is an instrument that measures the amount of photons (the intensity of light) absorbed after it passes through sample. . How to write an 5 paragraph essay University of Massachusetts Lowell — UMass Lowell (Navitas)! Lab Purpose The purpose of this experiment is to find out the molarity of each solution while finding out how to write an 5 paragraph essay Hurtwood House how many grams of sodium chloride we have. Materials 1. Wire gauze 2. how to write an 5 paragraph essay Hurtwood House! tongs 3. Burner 4. balance 5. Matches 6. hot hands 7. ring stand 8. ring clamp 9. graduated cylinder 10. how to write an 5 paragraph essay Hurtwood House! evaporating dish Procedure Steps: 1. Mass the evaporating dish 2. Record how many mL of solution you add into critical thinking students brighton college, the evaporating dish then mass them together. 3. Set the evap. dish on the ring clamp and start the burner then find the perfect flame. 4. Wait a certain amount of how to write an 5 paragraph essay Hurtwood House time depending on how much solution you have for the solvent to evaporate. how to write an 5 paragraph essay Hurtwood House! 5. After all the solvent is gone mass the evap. dish with the sodium inside it. 6. subtract the original mass of the evap. dish and you’ll find your mass of the sodium. Then you can set up your equation and find the molarity. Data Trial 1- evap. dish: 53.87g 20mL of how to write mba essays abingdon school solution : 20.32g evap. how to write an 5 paragraph essay Hurtwood House! dish & sodium: 54.16g sodium: 0.75g Molarity: 0.64M Trial 2- evap. dish: 53.50g 20mL of solution : 19.16g evap dish & sodium: 53.84g sodium: 0.34g molarity: 0.29M Trial 3- evap. dish: 53.50g 10mL of solution : 9.71g evap dish & sodium: 53.66g sodium: 0.16g molarity: 0.27M Trial 4- evap dish: 53.50g 10ml of solution : 9.63g evap dish & sodium: 53.64g. . involved utilizing equipment to dilute a sugar water solution . It also created solutions containing varying levels of harvard business articles appleby college concentrations and densities. Equations were used to figure the molecular weight of the sugar, and the critical thinking students brighton college, number of moles of sugar in the volumetric flask. There was also an equation to figure the Molarity, as well. As a result of the experiment, I now have a better understanding of the how to write mba essays abingdon school, density of a concentration, and what Molarity is . Observations Data Table 8: Initial Concentration Chemical Mass (g) Molecular Weight (g) Moles in Volumetric Flask Total Volume (L) Molarity (mol/L) Sugar (C12H22O11) 8 331.23 0.02415 25 0.9961 *As a side note, upon researching the molecular weight of sugar, I found it to be 342.30 g, not 331.23 g, however, in my calculation I used 15.00 g as the molecular weight of O2, whereas online 16.00 g was used. Eight8 g of sugar were placed on the scale, and then transferred into the volumetric flask (Table 8 shows the calculations of the molecular weight, moles, mass, volume and molarity recorded before doing so). how to write an 5 paragraph essay Hurtwood House! Distilled water was added to the sugar until a total of 25mL were in the flask. Then the flask was capped, and the solution was mixed together until the sugar was dissolved. Once dissolved, the solution was transferred into the glass beaker, and certain aspects were measured and recorded in table 9. Once this step was complete, 2.5 mL were removed from the. . Synergetic Solutions Report This paper will discuss the internal and external forces of change for how to write an 5 paragraph essay Hurtwood House, Synergetic Solutions . Persuasive essay strategies University of Massachusetts Boston — UMass Boston! The report will show the how to write an 5 paragraph essay Hurtwood House, factors that the leader in this organization needs to harvard business articles appleby college, consider to how to write an 5 paragraph essay Hurtwood House, implement a change strategy successfully and how to write mba essays abingdon school, it will describe at how to write an 5 paragraph essay Hurtwood House, least two change models the leader might employ. And we will evaluate the affordable essay writing the university of canberra (navitas), communication necessary to implement change using these models. The paper will show what kinds of resistance might the aspects of critical thinking trafalgar castle school, leader expect to how to write an 5 paragraph essay Hurtwood House, see in aspects of critical thinking trafalgar castle school, Synergetic Solutions and it will identify and explain at least five kinds of resistance. Finally the paper will show what strategies I might employ to manage each of these areas of how to write an 5 paragraph essay Hurtwood House resistance. According to the how to write an 5 paragraph essay Hurtwood House, stimulation, to survive in the how to write an 5 paragraph essay Hurtwood House, market world environments where change is the only constants organizations need to be agile, flexible, and capable of adapting to change quickly. how to write an 5 paragraph essay Hurtwood House! In this stimulation we will observe how change brought about as the result of strategic initiatives within a company work design and organization culture. Critical thinking students Brighton College! Company information: Synergetic solution Inc. is a $6 million company in the business of how to write an 5 paragraph essay Hurtwood House system integration assembling and reselling leading computers brands. It has 300 employees mostly in the sales and service departments working in five locations across the east–coast. most employees in this trading organization possess only basic computer assembling and trouble shooting skills, while a few. . Directions Using the formula for dilutions, write the recipe to how to write mba essays abingdon school, make 100 mL of a new solution of each solute based on having as much of the initial solution as you need. V1 M1 V2M2 SoluteFormula of persuasive essay strategies university of massachusetts boston — umass boston SoluteInitial Concentration (M)Final Concentration (M)Recipe For 100 mL of how to write an 5 paragraph essay Hurtwood House New SolutionSodium hydroxideNaOH1.0 M0.27 M(1.0M)(VNaOH) (0.27 M)(100 mL) VNaOH 27 mL Dilute 27 mL of 1.0 M NaOH to 100 mL.Potassium permanganateKMnO41.0 M0.34 MDilute 34 mL of 1.0 M KMnO4 to 100 mL.Copper (II) sulfateCuSO41.0 M0.25 MDilute 25 mL of 1.0 M CuSO4 to 100 mL.Ammonium hydroxideNH4OH1.0 M0. 43 MDilute 43 mL of 1.0 M NH4OH to 100 mL.Sodium carbonateNa2CO31.0 M0.56 MDilute 43 mL of 1.0 M Na2CO3 to 100 mL. Remember, you cannot make a solution that is more concentrated than the original solution . How to write an 5 paragraph essay University of Massachusetts Lowell — UMass Lowell (Navitas)! Solution Dilutions KEY Directions Using the 100 mL solutions that you just prepared and the formula for how to write an 5 paragraph essay Hurtwood House, dilutions, make a new solution of each solute - your choice of molarity and volume. SoluteFormula of SoluteInitial Concentration (M)Final Concentration (M) New Volume mLRecipe For New Solution Sodium hydroxideNaOH0.27 M Answer varies by how to write an 5 paragraph essay Hurtwood House chosen molarity.Potassium permanganateKMnO40.34 M Answer varies by chosen molarity.Copper (II) sulfate CuSO40.25 M Answer varies by chosen molarity.Ammonium hydroxide. . Mixtures and how to write an 5 paragraph essay Hurtwood House, Solutions can often become confusing because solutions are mixtures, but not all mixtures are solutions . A mixture can either be homogeneous or heterogeneous. A homogeneous mixture is where the how to write an 5 paragraph essay Hurtwood House, mixture’s components are distributed uniformly within the mixture. A heterogeneous mixture is where the components are not uniform. Mixtures can either be miscible or immiscible, the difference being whether or not the how to write an 5 paragraph essay university of massachusetts lowell — umass lowell (navitas), mixture forms a homogeneous mixture or not. In a solution a solute is soluble in a solvent. Aspects of critical thinking Trafalgar Castle School! In a mixture the solute may be completely insoluble to the solvent. A heterogeneous mixture that would be Solid/Liquid would be Skim milk. Although skim milk contains mostly water it also contains casein, which is a small protein. The casein protein is so small it may not be thought to be a heterogeneous mixture, but if the skim milk curdles the mixture can be separated. A Solid/Liquid solution could be Seawater. The seawater is homogeneous which makes it a solution . The mixture of oil and vinegar to make a vinaigrette salad dressing is a Liquid/Liquid heterogeneous mixture. Due to vinegar containing mostly water, it is how to write an 5 paragraph essay Hurtwood House, not soluble in the oil. Vinegar by itself would be a Liquid/Liquid solution . Foam is an example of a Liquid/Gas heterogeneous mixture because it is a mixture of gas bubbles in a liquid. Seltzer water is critical thinking students brighton college, a Liquid/Gas solution because it.