this experiment‚ the samples prepared at this experiment the sample as delivered was analyzed without any kind of treatment (sample I)‚ the sample with slow cool was prepared melting the bulk material at a heater an letting it cools at the heater at a slow rate (sample II)‚ finally‚ the sample with quick cool was made melting the bulk material and then slow cooled as the sample II‚ after this the sample was melted again and quickly cooled using liquid nitrogen (sample III). Those samples were analyzed
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words. For each answer‚ include the address of the website (or title and author of a book or article) that you used to help you answer the question. 1. Which type of compound usually has higher melting points‚ ionic compounds or covalent compounds? What is the reason for this difference in melting points? (3 points) 2. Do ionic compounds conduct electricity as: (3 points) a. Solids? b. Liquids? c. Aqueous solutions (when the ionic compounds are dissolved in water)? 3. Do covalent
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begins to warm‚ earths polar ice caps melt and slowly start the elimination of life. This ad demonstrates the cause and effect of global warming. The world inside the lower quadrant of the hourglass is slowly getting swallowed by the sea due to the melting ice caps above. Within the hourglass there’s text stating “we are slowly running out of time‚ act now before it’s too late”. In the top of the hour glass a polar bear and penguin sit upon two nearly melted ice caps. The world below has cars driving
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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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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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GLOBAL WARMING AND IT’S EFFECTS ON GLACIERS Global Warming The average global temperature has raised more than expected in the past few decades. Many prefer to use the milder term ’climate change’ instead of the harsher ’global warming’ to describe this change in average global temperature. The main cause of global warming is thought to be the ’greenhouse effect’ that is mainly caused by us humans. With an increase in temperature glaciers worldwide are melting faster than the time taken for new
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Arctic sea ice loss Main articles: Polar ice packs and Climate change in the Arctic The decline in Arctic sea ice‚ both in extent and thickness‚ over the last several decades is further evidence for rapid climate change.[60] Sea ice is frozen seawater that floats on the ocean surface. It covers millions of square miles in the polar regions‚ varying with the seasons. In the Arctic‚ some sea ice remains year after year‚ whereas almost all Southern Ocean or Antarctic sea ice melts away and reforms
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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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