Analysis The melting temperature of sodium thiosulfate can be determined by checking our data. Since a substances temperature remains constant while it undergoes a phase change‚ we can see that our sample changed from a sold to a liquid at 46.0°C. This is the temperature of the sample between time periods t1= 130s and t2= 480s. In order to find the Heat of Fusion (∆H Fusion) of sodium thiosulfate we used to calculate how much energy the water bath lost during the sample’s melting period. That
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Recovery Data. Recrystallized Aspirin Wt. of watchglass + filter paper 53.081g Wt. of watchglass + filter paper + product 55.995 Weight of product 2.914 Theoretical Yield 2.61g % Yield 111.65% Table 5. Melting point determination. Crude Aspirin Recrystallized Aspirin Melting point 118-130°C 134-136°C Literature value 135°C 135°C Table 6. Differentiation of starting materials. Substance Sol’y in water +/- Fecl3 test +/- KMnO4 +/- Acetic Chloride Dissolved acetyl chloride. Clear
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Making own sweets is so much fun‚ and looks impressive for very little effort. There’s no baking involved in this recipe just a little chopping‚ rolling and melting and the process is pretty therapeutic. Once got the hang of it so can experiment a little too try coating or drizzling them with dark chocolate. The quantities provided below should make about thirty chocolates‚ taking into consideration the fact that a fair amount of mixture may disappear as make them up. Ingredients: 120g Hazelnuts
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Interview Form in Economics 3.1 Read the questions carefully and tick the blank which correspond to your most preferred option. 1. What products would you like the most for the student marketer-entrepreneurs to sell during the Market Week”? ____a. School supplies (ball pens‚ paper‚ etc.) ____b. Food for snacks or recess (biscuits‚ cookies and sandwiches) ____c. accessories (hair accessories for girls‚ key chains and cell phone accessories for boys and girls) 2. What will be your
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University of the Philippines‚ Diliman vo_tabell@yahoo.com Abstract This paper discusses the use of the cooling curves in the determination of the phase diagram of a Lead-Tin system. The inflection points of these cooling curves were obtained by melting a series of mixtures of lead and tin at varying compositions. These critical points were used on a temperature versus percent tin plot‚ thus obtaining the experimental phase diagram. Comparing the theoretical critical temperatures to the experimental
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Task 1 Foundry Work Sand casting involves many sequences and there are as follows: - Design and manufacturing the casting. When doing this all vertical edges must be tapered as to make it easier to lift the pattern out of the mould. - Contraction allowances have to be added to the pattern because it shrinks in size in all dimensions. In this case it’s Aluminium‚ which has a contraction allowance of 1.3%. - Machining allowance: Castings are usually machined so that they fit perfectly with
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the following items. You will need bread‚ you can use any type of bread you want as long as it is sliced‚ because it will need to lay flat in a skillet. Next you will need cheese‚ there are so many different kinds‚ all having different flavors and melting qualities‚ and you can even combine different types for unique flavors. Other items you will need are a stove‚ skillet with lid‚ spatula‚ and cooking oil or butter. Once you have everything‚ the next thing you will do is place your skillet
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difference between the final volume (v2) and the initial volume (v1). Using the density of water (1.0g/mL)‚ this volume can be converted into mass. This concept is shown by the equation [M= (v2-v1) x (1.0g/ml)]. To determine the energy consumed by the melting ice (E)‚ we must determine the energy released by the water to make the ice to melt. This energy can be determined by using the equation to calculate the energy of the temperature changes. The mass of the water releasing heat is determined by multiplying
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Introduction The purpose of the experiment was to determine the melting points of compounds using a Mel-Temp device. The melting point of naphthalene‚ urea‚ and sulfanilamide are found. This is then followed by the measuring of an unknown compound‚ and an impure sample (a small amount of naphthalene mixed with the unknown). Experiment In the lab‚ the height of the chemical in the capillary was set to 2-3 mm thickness. The voltage at the Mel-Temp started at a low setting of 1.5-2. The heat was
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Our Iceberg Is Melting is written by John Kotter‚ the leadership and change guru at Harvard Business School and Holger Rathgeber‚ the modern global manager from Frankfurt‚ Germany. The main topic and the author’s purpose in writing the book are to make successful change through the eight step process. The type of the book is management book that can use by people in every level such as manager in one organization‚ high school student‚ executives‚ retirees and others in order to better achieve what
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