chemistry came from the word organism. Prior to 1828‚ all organic compounds had been obtained from organisms or their remains. The scientific philosophy back then was that the synthesis of organic compounds could only be produced within living matter while inorganic compounds were synthesized from non-living matter. A theory known as "Vitalism" stated that a "vital force" from living organisms was necessary to make an organic compound. 1828‚ a German chemist Friedrich
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Serology Serology? What is serology? How do Forensic Scientists use serology? Serology is the study of blood‚ blood serum‚ saliva‚ semen‚ and other bodily fluids. However the reason that this became a discipline of Forensic Science is because forensic scientists can use the DNA found from the different assortments of bodily fluids in order to narrow down and eliminate possible suspects. Forensic Serology is the study of serology in the relation to crimes and other legal matters‚ using a biological
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Briefing Thin-layer chromatography (TLC) is an extremely valuable analytical technique. It provides a rapid separation of compounds‚ and gives an indication of the number and nature of the components of a mixture. TLC can also be used to identify compounds by comparison with known samples‚ to check the purity of a compound‚ or to monitor the progress of a reaction‚ an extraction‚ or a purification procedure. This experiment will introduce you to the mechanics of TLC‚ and the chemical principles
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months.) 8.3% 4. Compare the accumulated balance in three accounts that all start with an initial deposit of $1000. All three accounts have an annual percentage rate of 5.5%‚ but the first account compounds interest annually‚ the second account compounds interest quarterly while the third account compounds interest monthly. Make a table that shows the accumulated balance in all three accounts for the first ten years. a. Paste the first ten rows of each table your Word document. annual quarterly
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help you answer the question. Which type of compound usually has higher melting points: ionic compounds or covalent compounds? What is the reason for this difference in melting points? (3 points) Link: http://misterguch.brinkster.net/covalentcompounds.html Answer: Ionic compounds have a higher melting point the heat needed to break down the bonds between the compounds is much higher than not needing to break down any bonds at all. Do ionic compounds conduct electricity as: (3 points) Link:
Free Ionic bond Chemical bond Covalent bond
derivatives 1a-c using catalytic amount of K2CO3 and n-butanol as a solvent to afford the disubstituted 1‚2‚4-triazoles 3-7 bearing benzothiazole‚ benzotriazole‚ quinoloxymethyl and benziimidazole ring systems in moderate yields. The structures of compounds 3-7 were confirmed by their spectral data. Their IR spectra revealed the disappearance of the characteristic hydrazide carbonyl and cyano absorption bands. The 1H NMR spectra showed signals corresponding to the two methylene protons in addition to
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Properties of Different Bonds An ionic compound forms from a nonmetal and metal element. A covalent compound is formed by two non metal elements. A metallic compound is formed by two metal elements. Metallic compounds have generally high melting points‚ are loose and flexible with their electrons‚ conduct electricity well‚ and have low solubility in water. Ionic compounds are generally crystals‚ have a high melting point‚ and usually have high solubility in water and conduct electricity well when
Free Ionic bond Chemical bond Electron
Objective: Part 1: The aim for part 1 of the Thin Layer Chromatography is to learn the technique and visualization of the colorless compound. Secondly‚ is to identify the unknown compound based on the comparisons made with standard compound. Part 2: The aim of separation technique by Thin Layer Chromatography is to separate the mixture of individual compounds from the spinach leaf sample used. Material and apparatus: Part 1 : Analysis of Analgesic Drugs Material: Aspirin Acetaminophen
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Chemistry •Matter • • • States Properties Classification Chemistry is the study of the composition‚ properties and structure of matter. it is considered “the central science”; blending at one extreme into physics‚ mathematics‚ engineering and sometimes into earth and life Chemistry Is the study of the matter‚ its classification‚ composition‚ properties and structure; the changes it undergoes‚ the energy transformation that goes with the change‚ and the laws and principles governing such changes
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Introduction Extraction involves dissolving a compound or compounds either from a solid into a solvent or from a solution into another solvent. Extraction is a method used to purify a substance by removing the impurities that was added to it. A solvent- solvent extraction is a type of extraction that is most commonly done by using two substances that are typically insoluble with each other. An acid-base extraction is a solvent-solvent extraction‚ in almost every case one of the solvents is water
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