del Valle Department of Biological Sciences‚ College of Science‚ University of Santo Tomas‚ España‚ Manila‚ Philippines Abstract Caffeine was extracted from Lipton tea leaves by multiple extraction techniques namely solid to liquid extraction and liquid to liquid extraction; the purification by sublimation and melting point determination. Three teabags with weight 6.2674g were boiled with water and then extracted with 60 mL DCM; extract was dehydrated with anhydride Na2SO4 then was collected
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eutectic point of biphenyl. Unknown substances were then tested using the mixture melting point method in order to determine their identities. INTRODUCTION The melting point of a solid is the temperature where the substance changes from a solid to a liquid state. Using known substances and determining their melting points is a way to establish the purity of and to identify a sample. This lab demonstrates the temperature range where certain compositions of solid naphthalene and biphenyl begin to melt
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Does Adding Salt to Water Make it Boil at a Higher Temperature? Project Design Plan Everyone knows that water boils at 212°F‚ but does adding salt to a pot of water make it boil at a higher temperature? Being a person that cooks frequently at home‚ I wanted to test the debated idea that adding salt to my water will make it boil faster. One of my friends says it does raise the temperature and therefore cooks it faster. My other friend says it only helps it taste better. Literature
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ECF 1. Prevalent cation is Na+ 2. Prevalent anion is Cl- E. Mechanisms controlling fluid and electrolyte movement a. Diffusion i. Movement of molecules from high to low concentration 1. Occurs in liquids‚ solids‚ gases 2. Membrane separating two areas must be permeable to diffusing substance 3. Requires no energy b. Facilitated diffusion i. Movement of molecules from high to low concentration without energy 1. Uses specific carrier molecules
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MODERNITY AND WEST: HISTORICAL PERSPECTIVE. Modernity and West are two closely tied terms. We often even use these as synonyms; in place of one or the other. The reason why these two words are so closely related is that modernity is part of the new identity that the West built for itself after having found the Americas. In sociology‚ the first and foremost clues of modernity are found in Europe‚ and it has been seen that modernity developed under the banner of Europe all along‚ therefore‚ it is
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The topic tradition and modernization is very important topic in the fast changing modern world where every person faces contradiction between his traditional culture and modernization. Modern thoughts‚ life style‚ working culture‚ clothing etc. all integrated part of modernization. Though there are some conflict in the traditional way and modernized way of doing things‚ but these two means different leads to the same results. let us understand what is tradition First and modernization? As mentioned
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Postmodernity: A Break from Modernity Postmodern is a complex term with multiple usages. As a consequence‚ it is open to conflation and confusion. The “post” in postmodern is not definitive and it’s up to the writers to clarify their particular usage. (Gibbins & Reimer‚ 1996‚ p. 8) As such‚ the meaning of “post” in this paper refers a “break from”‚ “opposition to”‚ “difference to and from” and a response to”. Works of Karl Marx and John Stuart Mill; Friedrich Nietzsche and Michel Foucault
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PORTFOLIO * Antiseptic Liquid * Hand Sanitizer * Medicated Plaster * Saving Cream with fresh fragrance * Body Wash * Soap – Original‚ Skincare‚ Cool‚ and Re- Energize * Liquid Handwash- Original‚ Skincare‚ Sensitive and Fresh * No Touch Handwash- Original and Cucumber PRODUCTS UNDER BRAND PRODUCTS UNDER BRAND APPROVED BY INDIAN MEADICAL ASSOCIATION ANTISEPTIC LIQUID DETTOL ANTISEPTIC LIQUID Dettol Antiseptic Liquid is a proven safe and effective
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Hydraulic fracturing is when a hole or "well" is drilled deep into the ground‚ in an effort to extract valuable natural gas reserves which exist beneath the surface. The process of constructing a hydraulic fracturing well includes drilling into the Earth--first vertically and then horizontally‚ then lining the well with a two-terminal tube with one terminal that is filled with water while the other pipes the recovered natural gases up above ground (Withgott & Laposata‚ 2014). In order to exhume the
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Discussion on the Ethical Implications of Hydraulic Fracturing by: Sebastian Potes 7/16/13 ! Abstract As concern grows over the environmental impact of hydraulic fracturing‚ implementing policy that protects people and their environment from these potential dangers becomes an essential piece of the renewable energy picture. Hydraulic fracturing‚ or fracking‚ is the technique of extracting oil and natural gas trapped under ground by injecting a mixture of water‚ sand‚ and chemicals into the
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