Practical 5: Properties of Compound Experiment 1: Properties of A Compound and Its Parent Elements Hypothesis The hypothesis of this experiment is magnesium oxide can be synthesized by combining (burning) the magnesium with oxygen. The chemical and physical properties of each element (magnesium‚ oxygen‚ and magnesium oxide) might be different‚ from the state‚ color‚ electrical conductivity‚ and pH. Aim This experiment was performed to synthesize magnesium oxide by direct combination of
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98075 Dear Mrs. Sylva‚ After days of research‚ I have come upon one of the substances that will be the ideal compound for the glaze. I conducted a test to analyze the solubility of the substance in water and alcohol‚ the conductivity‚ and melting point. Some substances came very close to passing all the tests‚ but only one substance was able to pass all of them. I recommend using sodium carbonate as your substance. Of all the substances‚ only two were covalent and two were ionic. The ionic
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lower the freezing point of water. For the ice cream maker‚ because the rock salt lowers the freezing point of the ice‚ the temperature of the ice/rock salt mixture can go below the normal freezing point of water. This makes it possible to freeze the ice cream mixture in the inner container of the ice cream machine. For the salt spread on streets in wintertime‚ the lowered freezing point means that snow and ice can melt even when the weather is below the normal freezing point of water. Both the
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3 3.4 Determination of Melting Point 3 4 Results and Calculation 4 4.1 Mass 4 4.2 Percent yield 4 4.3 Melting Point 4 4.4 Appearance 4 5 Discussion 5 6 Conclusion 5 References R1 Synopsis This report is based on preparation and recrystallization of aspirin. The objective of the experiment is to conduct the synthesis of aspirin and reinforce the skills of recrystallization and technique of melting point determination. Both experimental
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A qualitative analysis experiment was conducted to determine the identity of an unknown aldehyde or ketone. The tests include a Tollens test‚ a Schiff test‚ an iodoform test‚ and a derivative melting point test. The data of the first three tests was inconclusive. The final derivative melting point test was utilized to successfully determine that the unknown was the ketone‚ Propiophenone. Introduction: Qualitative analysis is a method or series of methods used to determine the identity
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Friedel-Crafts alkylation was performed by adding t-butyl alcohol to p-dimethoxybenzene in order to produce 1‚4-di-t-butyl-2‚5-dimethoxybenzene. This reaction yielded 0.009g of 1‚4-di-t-butyl-2‚5-dimethoxybenzene having a percent yield of 5%‚ and a melting point range of 54.8°C-56.9°C. Introduction This reaction is designed to put functional groups onto aromatic rings. This is done through an electrophilic aromatic substitution where a positive species is strong enough to pull electrons out of the ring
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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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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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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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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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