purpose of this lab is to identify an unknown aldehyde or ketone substance using chemical tests. The chemical tests used in this experiment are solubility‚ Schiff‚ Bisulfite‚ and Iodoform tests. Also‚ a 2‚4-dinitrophenylhydrazone derivative synthesis reaction will be completed from which a melting point will be obtained. The chemical test results and the melting point analysis will be compared to the table of compounds given to find the unknown’s identity1. Experimental An unknown substance labeled
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When elements combine to produce a compound‚ each element is assigned an “apparent” charge. This apparent charge‚ the charge an atom would have if both electrons in each bond were assigned to the more electronegative element‚ may be positive or negative. It is called the oxidation number or state of the element in the compound. Oxidation numbers are very useful in keeping track of what happens to electrons when various elements combine to form compounds. By remembering a few generalizations
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firstly used in order to find out if it was a positive drug‚ in order to follow a further analysis. Gas Chromatogram (GC) and mass spectrum was used for further analysis‚ in order to find out what exactly was this drug‚ and find its mixtures and compounds. Results From the chromatogram/spectrum peak report it is shown that there are two retention times of 15.67 and 9.66. The first peak has 9.66 retention time and has one possible match out of the five which is included in appendix 1.The highest
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Though children’s food packaging is currently free of BPA due to the chemical industry volunteering to use BPA alternatives‚ the decision to ban the endocrine system disrupting chemical guarantees it is phased out permanently. Swedish officials have said they are taking such measures as a “matter of precaution.” The Swedes would also like the European Union to take a similar approach when addressing the controversial chemical. In fact‚ Swedish Minister of Environment Lena Ek is on record as saying
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of an animal‚ plant‚ or fungus. It can also pertain to a class of chemical compounds that formerly comprised only those existing in or derived from plants or animals‚ but that now include all other compounds of carbon. This is the first thing that we need to understand. The fact that organic compounds contain carbon and are also combined with nitrogen‚ bromine‚ hydrogen. Sulfur‚ and chlorine and that the majority of the compounds found and tested in crime scene labs are going to be organic. The
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Substitute lab for Unit 6 lesson 3: Stoichiometry: Counting by Measuring Mass Purpose Determine the mass of several samples of chemical elements and compounds and use the data to count atoms. Procedure Start Virtual ChemLab and select Counting by Measuring Mass from the list of assignments. The lab will open in the Calorimetry laboratory. Part 1‚ Measuring Metal 1. Click on the Stockroom. Click on the Metals sample cabinet. Open the top drawer by clicking on it. When you open the drawer‚ a
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Separation of Mixtures 9/11/11 * Introduction: A compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Unlike a compound‚ a mixture is a material system made up by two or more different substances which are mixed together but are not combined chemically. There are two kinds of mixtures‚ homogeneous and heterogeneous. Homogeneous mixtures have the same composition and appearance throughout
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A mixture has a variable composition therefore there is not ONE formula for it. Slide 7 and 9: What are the differences in elements and compounds? An element has the same kind of atoms‚ like carbon‚ oxygen‚ and hydrogen. Atoms of the same type are classified as elements. Whereas a compound is a chemical combination of elements‚ that may form molecules or crystals. A compound can be chemically broken down into simpler parts. ● Slide 10: What are the 2 major types of mixtures and how are they different from
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ACYL COMPOUNDS: SOAPS AND DETERGENTS Experiment # 8 I. Objectives To observe the general properties of carboxylic acids. To compare the acidity of carboxylic acids and phenols. To verify experimentally the interconversion among acyl compounds. To become familiar with the physical and chemical properties of fats and oils and to understand the chemical basis of these properties. To learn how to prepare soap. To compare the properties of soap and synthetic detergents. II. Data and
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rules for the atomic theory are that all matter is made up of tiny particles‚ or atoms‚ atoms are always invisible and indestructible‚ all atoms of a given element are identical in mass and properties‚ compounds are formed by a combination of two or more different kinds of atoms‚ and a chemical reaction is a rearrangement of atoms. John Dalton was born on September 6‚ 1766 in Eaglesfield‚ England‚ UK to a Quaker family. He had two surviving siblings‚ Mary Dalton and Jonathan Dalton‚ but both
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