pleasant flavor‚ innocuousness‚ smoothness during application‚ adherence and easy intentional removal. This work involved the development of a lip balm formulated with certified organic raw materials and the execution of stability tests: fusion point determination‚ evaluation of organoleptic characteristics (color‚ odor and appearance) and functionality evaluation (spreadability test). The formulation selected after the Preliminary Stability Test was submitted to the Normal Stability Test under
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The crude naphthalene had a melting point range of 85°-90° C while the 35.4% yield of pure naphthalene had a melting point range of 70°-76° C. Recrystallization was used to purify the salicylic acid. Recrystallization is the process of dissolving the original solid in a hot solvent and then allowing the solution to cool to let the solid crystallize again. The crude salicylic acid had a melting point range of 150°-153° C while the pure salicylic acid had a melting point range of 155°-158° C. (Percent
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Aim: To investigate the difference between the melting point of dark and milk chocolate. Hypothesis: If both chocolate is heated then dark chocolate will melt faster because milk chocolate has more fats Variables (i) Independent: Two substances will be tested dark chocolate and milk chocolate. (ii) Dependent: The temperature at which each substance melts
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intermolecular attraction. For example‚ the freezing point of a solution is lower than that of the of the pure solvent and the boiling point is higher. Colligative properties of solution are those that depend on the concentration of solute particles in the solution‚ regardless of what kinds of particles are present the greater the concentration of any solute‚ the lower the freezing point and the higher the boiling point of a solution. FREEZING POINT LOWERING A liquid begins to freeze when temperature
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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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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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Old Dominion University ORGANIC 214 Alkene Addition Submitted by: Alkene addition: Bromination of (E) Stilbene Introduction: In this lab we used the greener approach‚ which involves the addition of bromine across a double bond. When bromine reacts with E-stilbene (trans-1‚2-diphenylethene)‚ two new chiral carbons are created from the sp2 carbons‚ therefore 3 different dibrominated stereoisomers are possible: meso-(1R‚2S)‚ or the raceminc mixture-(1R‚2R) or (1S‚2S)-dibromo-1‚2-diphenylethane
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salt melts ice? Salt melts ice by lowering the freezing point of the water around the ice. The ice melts and is unable to re-freeze except at a much lower temperature. Adding minerals‚ like salt‚ to ice can increase the rate of melting by disrupting the balance of the molecule. It is hard for salt to be absorbed by ice‚ but easy by water. Salt‚ on the other hand‚ combines with the ice (water) to produce a solution with a lower freezing point. This would melt the ice without sunlight‚ as long as the
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Before our group began the procedure itself‚ I thought about the whole concept in watching an ice cube melt in a beaker filled with vegetable oil. At first‚ I thought it was going to be interesting‚ right of the bat with bubbles and other reactions that catches interest. Once we started the procedure by inserting the ice cube into the beaker filled with vegetable oil‚ the dullness and boring state also began to flow. We sat there watching for a good five minutes before any visual reaction was taking
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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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