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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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
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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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
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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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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Purpose: a) Determine the melting points of two organic compounds known to have the same melting range when pure. b) Determine the mixture melting point of a mixture of the two pure compounds. c) Identify an unknown organic compound by determining its melting point and mixture melting point. Procedure and Observations: Using the procedure outlined in Appendix A of the Lab Manual‚ approximately equal samples of p-Nitrophenol and acetanilide‚ which are known to have the same melting range
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Table 3 ADMET Pharmacokinetic properties Ligant Compound Name Solubility BBB CYP2D6 Absorbtion Hepatotoxic AlogP98 PSA_2D level Level Level 2-nitro-3-phenyl-3- 6a (phenylthio)propan- 3 2 -0.956743 0 -1.19046 3.633 63.638 1-ol 3-(4-ethylphenyl)-2- 6b nitro-3- 2 1 -1.21276 0 -0.792508 4.576 63.638 (phenylthio)propan- 1-ol 3-(4- methoxyphenyl)-2- 6c nitro-3- 2 2 -2.05551 0 0.0841152 3.617 72.568 (phenylthio)propan-
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a series of prefixes and suffixes to name a certain compound. This system is also highly favored because its way of naming compounds is not only easier to understand and unambiguous‚ but it is also usually shorter than the common way. The IUPAC system’s uses include naming binary compounds between a metal and nonmetal‚ naming binary compounds between two nonmetals‚ naming polyatomic ions‚ and naming acids and bases. To name binary compounds between a metal and a nonmetal‚ there are two different
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