Recrystallization Experiment 2: Recrystallization & Melting Point • Most important method for the purification of organic solids • Separation of compounds based on differences in solubility between the compound of interest and its contaminants • Basic technique: 1. dissolve impure sample in an "appropriate" hot solvent Part A: Choosing a Solvent Part B: Purification of Phenacetin 2. cool solution slowly to induce crystal growth 3. filter resulting mixture to isolate crystals Reading:
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BALAOING‚ Patrize Aerielle A. BSTM 2-1D Lee Kuan Yew‚ GCMG‚ CH (born Harry Lee Kuan Yew‚ 16 September 1923)‚ is a Singaporean politician. He was the first Prime Minister of Singapore‚ governing for three decades. He is also widely recognised as the founding father of modern Singapore. Hồ Chí Minh (19 May 1890 – 2 September 1969)‚ born Nguyễn Sinh Côn‚ or Nguyễn Sinh Cung‚ also known as Nguyễn Tất Thành and Nguyễn Ái Quốc‚ was a Vietnamese Communist revolutionary leader who was prime minister (1945–1955)
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Research Paper First and foremost‚ the freezing point or melting point of water is the temperature at which water changes phase from a liquid to a solid or vice versa. The freezing point describes the liquid to solid transition while the melting point is the temperature at which water goes from a solid (ice) to liquid water. In theory‚ the two temperatures would be the same‚ but liquids can be super cooled beyond their freezing points so that they don’t solidify until well below freezing point
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EXPERIMENT 1 COLLIGATIVE PROPERTIES OF SOLUTIONS Date: December 03‚ 2013 Locker 21 Members: Vanessa Olga Dagondon Christine Anne Jomocan Janica Mae Laviste Nablo Ken Menez A. TYPES OF DISPERSED SYSTEMS Results and Discussion The first part of the experiment aims to differentiate the different dispersion systems. In this experment‚ three systems are introduced: true solution‚ colloidal dispersion and coarse mixture. The said three systems are classified through a property of colloids known as the
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In 1975‚ The Khmer Rouge became the ruling political party of Cambodia after overthrowing the Lon Nol government. Following their leader Pol Pot‚ the Khmer Rouge imposed an extreme form of social engineering on Cambodian society. They wanted to form an anti-modern‚ anti-Western ideal of a restructured “classless agrarian society’’‚ a radical form of agrarian communism where the whole population had to work in collective farms or forced labor projects. The Khmer Rouge revolutionary army enforced
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crock pot. I’ve been reading a lot of crock pot cooking forums lately and there seems to be a common thread; many people are discouraged from cooking with their new slow cookers. Why is this? What has come to pass to make newer crock pots more frustrating to cook with than older ones? I saw so many posts claiming that people had returned their new slow cooker and dug out the one from their grandmother‚ or went rummaging around to thrift shops and garage sales to find a "good old crock pot" for $5
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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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What Interaction Of Outside Influence Makes Ice Melt Fastest? A. Explain the significance of the given factors in your project design plan: • Problem statement • Relevance of your testable question Problem Statement: I have lived in a place that during the winter‚ ice would form on the streets and sidewalks and have wondered why things such as salt or sand are used over other methods to help de-ice the surfaces? Why is salt or sand the most commonly used substances when addressing this issue
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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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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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