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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completes the statement or answers the question. ____ 11. The phase change that is the reverse of sublimation is a. deposition c. condensation. b. vaporization. d. melting. ____ 12. The phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid first is a. melting. c. deposition. b. sublimation. d. vaporization. ____ 13. If a solid piece of naphthalene is heated and remains at 80°C until it is completely melted‚ you know that
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amount of heat required to convert a mass of a solid at its melting point into a liquid without an increase in temperature. As difficult as this may sound‚ this experiment can be carried out with minimal equipment. The following equipment was needed‚ a 100mL graduated cylinder‚ a calorimeter‚ a digital thermometer‚ a calculator‚ water‚ and ice cubes. Procedure: The procedure to find the heat of fusion for ice was measured by melting ice cubes in a known volume and temperature of water and carefully
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Lab 6: Organic Compound Analysis Isabella O’Toole CHY 116 Friday 1:15-4:00 Lab Conducted on 4-12-13 and 4-19-13 4-26-13 This lab was conducted in order to determine the chemical composition of an unknown organic acid. A known mass of acid was dissolved into 30mL of either water or methanol (depending on solubility) and titrated with standardized sodium hydroxide. Data from this allowed the molar
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How do different liquids and solids affect the boiling and freezing point of water? Name 02/12/12 ABSTRACT There are many different substances that affect the freezing and boiling points of water. This experiment was designed to test the effects of five liquid and five solid substances/mixtures on the freezing and boiling points of water. It was hypothesized that if we tested five liquid and five solid substances/mixtures then the results would show that the solids would have a greater affect
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determining the identity of the unknown sample are listed in Table 1. Density (g/cm3) Molecular Weight (g/mol) Melting Point (ºC) Polypropylene 0.905 42.08 170 Polyethylene 0.92 28.05 130-145 Polycarbonate 1.2 158 310 Polystyrene 1.05 104 240 Polyvinyl chloride 1.4 62.5 160-172 Table 1 Properties for five known polymers (Callister 737-775) The melting temperature of a polymer is the point at which it transforms from the solid form to a viscous liquid in which there is little molecular order (Callister
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