Khoa Kirk Hoang OCHEM 262 Lab: Exp 35- Oxidation + Reduction Tablular Data Pre-Weighted Flask | Product + Flask | Product | % Yield | 5.36g | 5.401g | 0.041g | 41% | (60-70% = Acceptable) Actual Melting Point | Experimental Melting Point | 212C | 199.8 | ------------------------------------------------- (10C-15C variations acceptable) Reasons %yield: A reason that our percent yield is lower then what is acceptable can be due to various reasons. First‚ the amount of product we
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experiments 3.2 and 3.4 was to determine whether the melting/freezing or boiling point is a characteristic of the property of the substance. A characteristic property is a certain property (physical or chemical) that can determine or identify the substance. For example‚ density and magnetism are two characteristic properties that can distinguish objects from one another. In this case‚ we are figuring out whether the melting/freezing or boiling point of a substance will help us find out what the substance
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Casting Pattern » Mold » Pour » Cool » Remove » Inspect Types of Casting : Expendable Mold‚ Multiple Use Mold Sand Casting : Expendable Mold casting process uses sand as molding material Requirements • • • • • • Mold : single or multiple use Melting Process Pouring Technique Solidification Process Mold removal Clean‚ Finish‚ Inspection METAL CASTING PROCESSES Categories • Expendable mold processes - mold is sacrificed to remove part • Mold (Sand‚ Shell‚ Vacuum‚ Expanded Polystyrene‚ Investment
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first structure is a trans isomer and the second structure is a cis isomer. Trans isomers have a higher melting point than cis isomers. b) No we won’t be able to tell the difference between the two isomers. This is because they are enantiomers. Enantiomers have the same melting point. 8. Increased intermolecular hydrogen bonding does increase the melting point. It causes the boiling point to be elevated since the molecules are more attracted to each other and thus require more energy to break
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expected to compete with traditional petroleum-produced polymers. The production of Polyhydroxybutyrate is well known in the medical field as it is mainly used for surgical pins and internal suture due to its biocompatibility. It has a high melting point with about 175C‚ which makes the material compatible as containers with high temperature usage. These properties of being biodegradable meaning its products decompose naturally without surgery needed to remove‚ and biocompatible meaning the body
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Unit C2‚ C2.2.3 Covalent structures 1. This drill contains an electric motor. The diagram below shows the main parts of an electric motor. The carbon contacts are made of graphite. Springs push the contacts against the copper ring. The contacts conduct electricity to the copper ring. The copper ring rotates rapidly but does not stick or become worn because the graphite is soft and slippery. Graphite has properties which are ideal for making the contacts in an electric motor. Explain
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temperature Step 8: Cooled the solution in an ice bath for 5 minutes Step 9: Collected the crystalized solid by vacuum filtration Step 10: Measured the melting point for the crystalize solid Reagent Table: Table 1: The chemicals and properties used in the reaction Compound Quantity Molar Mass (g/mol) Melting Point (C) Boiling Point (C) Anthracene 0.5g 178.23 216-218 340 Maleic Anhydride 0.25g 98.06 54-56 200 Potassium Bromide 100 119 63.38 759 Xylene 6mL 106.17
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% by volume of the fat‚ a nitrogencylinder With flowmeter is connected to suction of feed pump 40 3-5 Crystallization System ( Refrigeration Load : 1T/ HR-50 TR) Average Composition of a General purpose Bakery Fat : High Melting Point Middle Melting Point Lower Melting Point Til Oil (Sesame) 43-44ºC 35-36ºC 28-30ºC 50% 35% 12% 3% 100% Equipment Fat Temp ºC RPM Residence In Out Time Seconds Performer I 47+2 34+2 400-500 20 Performer II 34+2 24+1 400-500 20 Maturator I 24+1 28+1 175-200 90-180
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The literature value for the melting point range for Trans-9-(2-phenylethenyl)anthracene is 130-133 oC. The obtained range was lower than that at 120.3 to 123.8 oC. Because it is lower than the known value‚ this means the obtain product is not completely pure. Impurities in the compound can result in a decrease in the compounds melting point‚ which is observed here. The impurities could be 1-propanol due to an insufficient drying. If the experiment was performed again‚ the product would need to be
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by Actual yield of synthesised aspirin: 0.347g 0.347/1.196 * 100= 29 Percentage yield: 29% Melting Points Compound Began Melting (°C) Totally Melted (°C) Range (°C) Pure Aspirin 136 1-2 Crude Aspirin 125 130 5 Product from Willow Bark 120 125 5 The documented melting point for pure aspirin is 136°C. An impure compound will exhibit a lower melting point than this‚ which is what was observed in both the willow bark product and the crude aspirin. Pure aspirin has a narrow
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