was invented by a Russian botanist‚ Mikhail. S. Tswett‚ to assist him in the study of the analysis of the coloring in plants in 1903. (factmonster.com) There are four basic methods of chromatography: liquid chromatography‚ gas chromatography‚ thin layer chromatography and paper chromatography. Paper chromatography is the best method of separation used in candy chromatography. There are two phases incorporated in the process of separation of the candy color dyes. chromatography works because the components
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The hospital uses a network bridge to interconnect its logical network. A network bridge connects multiple network segments at the data link layer‚ which is Layer 2 of the OSI model. The Data Link Layer enables data to be transferred between network entities and might provide the means to detect and possibly correct errors that may occur in the Physical Layer. The hospital’s network is an Ethernet network. The Ethernet network uses a protocol called CSMA/CD which stands for Carrier Sense‚ Multiple
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CompTIA Security+ (Exam SY0-301) quick reference sheet Table of Contents .............................................................................. Fundamentals.............................................................................Page 1 Threats and Vulnerabilities.....................................................Page 1 Network Security.......................................................................Page 3 Application‚ Data‚ and Host Security..........................
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aqueous phase. OH O NaOH + NaI + H2O CH3I Before coming to lab‚ please review the following techniques: "Reluxing a reaction‚" "Extraction and washing‚" "Drying an Organic Solvent‚" "Evaporating an Organic Solvent‚" "Analyzing a Solution by Thin Layer Chromatography (TLC)‚" "Separating Mixtures by Column Chromatography‚" and "Characterizing Compounds by IR." Notice that this lab brings together most of the techniques that we have used this semester. Then complete the following table before coming
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SECURE ELECTRONIC TRANSACTIONS Introduction Secure Electronic Transactions (SET) is an open protocol which has the potential to emerge as a dominant force in the securing of electronic transactions. Jointly developed by Visa and MasterCard‚ in conjunction with leading computer vendors such as IBM‚ SET is an open standard for protecting the privacy‚ and ensuring the authenticity‚ of electronic transactions. This is critical to the success of electronic commerce over the Internet; without privacy
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Function Functions are basically the exact same as subroutines‚ except that they return a value. That means that the function itself has a type‚ and the function will return a value to the calling subroutine based on the code that it contains. An example of this would be a function that adds two numbers‚ shown below. A function is declared the exact same way as a subroutine‚ except using the "Function" keyword instead of "Sub". To return a value‚ assign a value of the proper type to the function’s
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an unknown mixture of colored compounds. The mixture will have three compounds from the following: azobenzene‚ azulene‚ 4-(p-nitrophenylazo)resorcinol‚ methyl red‚ bromocresol green. You can identify the components by separating them using thin layer chromatography (TLC) and comparing their Rf values with those of the
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Preparation of Dibenzalacetone by the Aldol condensation David o Neill Date of experiment: 14/12/2011 Apparatus Steam bath‚ ice bath‚ Buchner funnel‚ beaker‚ conical flask‚ filter paper‚ TLC apparatus‚ Melting point apparatus Materials / chemicals Benzaldehyde‚ acetone‚ ethanolic sodium hydroxide‚ ethanol Introduction The synthesis of dibenzalacetone is formed from an Aldol condensation reaction. An Aldol condensation reaction is a very effective way of forming a carbon – carbon bond reaction‚ in
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Biological chemistry 1B Experiment 1: Thin layer chromatography [TLC] Aim The aim of this experiment is to apply the technique of TLC to first separate out a mixture of coloured dyes and then to do the same for selected range of amino acids. Procedure 2 MMs of each different colour were collected into separate beakers. Approximately 5 drops of water is added to each of the beakers containing the MMs and the tablets were stirred until
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as the compounds with lower Rf values‚ the compounds that are most polar tend to stay longer with the polar adsorbent‚ while the least polar compound travels with the eluent that is lower in polarity. 2. TLC in today’s experiment stands for Thin Layer Chromatography. 3. From least polar to the most polar: Heptane-Toluene-Acetone-Methanol-Acetic acid ‚ ‚ ‚ ‚ 4. The Rf (Retardation factor) is the ratio of the distance that the compound/mixture traveled to the distance the solvent/mobile
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