nitrogen and halogens – elements that are most of the time the only ones involved in organic compounds. The experiment focused on the Sodium Fusion test‚ which tested for all elements except oxygen. In the test‚ the test compound is broken down into its elements‚ which then bond individually with sodium. The presence of sulfur was tested either with lead acetate or sodium nitroprusside. The presence of nitrogen was tested with ferrous ammonium sulfate and potassium fluoride. The presence of any halogen
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of the solution as soon as it starts to boil. 8) Repeat steps 3‚ 6 and 7 using distilled water. 9) Make observations. Expected results: the boiling point of the salt solution will be higher than the boiling point of the distilled water because sodium chloride is a non- volatile substance and an impurity when added to water. Therefore the substance does not change to vapour under normal heat conditions‚ because the bonds in the substances are stronger so a lot of heat must be applies and this will
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withers. Isotonic environments are preferred by most microbes for the most advantageous growth‚ although some live in slightly hypotonic solutions. (Alonzo‚ 2008) Growth in NaCl Solutions Samples of S. cerevisiae and S. epidermidis were placed into sodium chloride (NaCl) solutions of 1‚ 7 and 15 percent which were supplied in the lab kit. The S. cerevisiae results are as follows. After 24 hours of observation there was a moderate amount of growth in the 1% NaCl solution which had a cloudy overall
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’wetter ’ so that it is less likely to stick to itself and more likely to interact with oil and grease. Soaps are sodium or potassium fatty acids salts‚ produced from the hydrolysis of fats in a chemical reaction called saponification. Each soap molecule has a long hydrocarbon chain‚ sometimes called its ’tail ’‚ with a carboxylate ’head ’. In water‚ the sodium or potassium ions float free‚ leaving a negatively-charged head. Soap is an excellent cleanser because of its ability to act
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Desiree Trujillo March 6th‚ 2013 Lab # 3 Chemistry 101 Physical & Chemical Properties Purpose To examine the physical and chemical properties of multiple natural chemical substances‚ and to determine which changes are chemical and which are physical. Data Solubility or Reaction | SubstanceName | Color | Odor | Effectof Heat | ColdH2O | HotH2O | LitmusTest | DiluteHCl | DiluteNaOH | Mg | Silver
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evaporation when forming crystals. Phenolic compounds will undergo salt formation with sodium hydroxide solution‚ NaOH.Therefore‚sodium hydroxide solution is allow to use to extract a carboxylic acid or phenolic compound from its solution in an organic solvent.An organic solvent can be used to remove organic impurities from a carboxylic acid or phenol dissolved in aqueous sodium hydroxide.Aqueous solution of Sodium
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mean by autoprotolysis? 30. Mention uses of H2O2. 31. What is Per hydrol & Hyperol? 32. Lithium reacts with water less vigorously than sodium. Give your reason 33. Explain the Biological importance of Mg & Ca. 34. What happens when Magnesium burnt in air? 35. Describe the importance of Plaster of Paris. 36. Describe the important uses of Caustic Soda‚ Sodium Carbonate & Quick lime. 37. Explain inert pair effect. 38. Give the formula of Borazine. What is its common
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Reactivity starting from the least reactive. Li‚ Na‚ K c) A piece of sodium was dropped in a trough containing water. i) Describe what you would see. Sodium melts almost at once to form a small ball that dashes around the surface. . If the sodium becomes trapped on the side of the container‚ the hydrogen may catch fire to burn with an orange flame ii) Write a word and symbol equation for the reaction. sodium + water → sodium hydroxide + hydrogen 2Na + 2H2O → 2NaOH + H2 iii) what would be the
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Performed: 02/05/2013 Submitted: 02/06/2013 Section 1: Title Physical and Chemical Properties Section 2: Purpose This labs is intended to help me investigate chemical and physical properties of pure substances. Section 3: Procedure In this experiment‚ I observed substances in their natural state‚ and recorded their apparent physical properties. I then tested the substances to determine how they react when their natural environments were altered. The pure substances were tested to see
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1. Standarization of NaOH with Potassium Hydrogenphthalate (KHC8H404) The hygroscopic nature of NaOH requires its solution to be standardized with a stable primary standard such as potassium hydrogen phthalate. The exact molar concentration of NaOH solution can then be accurately determined. 1.1) Prepare the stock NaOH solution by dissolving about 4 g of NaOH pellet in 100 mL of deionized water. Note that NaOH is a hazardous chemical which is corrosive to skin and irritant to eye‚ be cautious and
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