standards given). The time it takes to form the precipitate indicates if it is a primary or secondary compound. A secondary compound’s formation of precipitate is be faster than that of a primary compound. Another test involves sodium iodide. This time‚ sodium iodide is added to three test tubes‚ already with the products‚ and if a precipitate forms at room temperature‚ it is a primary compound. If the mixture precipitates at 50˚ C (after heating)‚ then it is a secondary compound. The results of both
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IGSCE Chemistry Notes Oxides Oxides are used to determine whether an element is a metal or a non-metal. Most non-metals are classed as acidic oxides. While most metals are classed as basicoxides. Acidic Oxides * Reacts with water to form acids * Neutralises alkaline solution to form salt + water Basic Oxides * Neutralises acidic solutions to form salt + water Amphoeteric Oxides * These are non-metals which display both acidic and basic properties Alkaline Oxides * Reacts
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BACHELOR OF SCIENCE (HONS) BIOTECHNOLOGY YEAR 1 SEMESTER 1‚ 2 & 3 UDBB 1164 FUNDAMENTAL ORGANIC CHEMISTRY 0 EXPERIMENT 1 PROPERTIES OF HYDROCARBONS Introduction Hydrocarbons are compounds which contain only carbon and hydrogen‚ can be classified into several types‚ depending on their structure. Aliphatic hydrocarbons are divided into three classes: alkanes (e.g. methane‚ ethane and propane) have only single bonds‚ and are said to be saturated; alkenes (e.g. ethene and propene)
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STUDENTS’ INDUSTRIAL WORK EXPERIENCE SCHEME (SIWES) REPORT AT DANGOTE SUGAR REFINERY PLC SHED 20‚ APAPA –WHARF‚ APAPA LAGOS BY ADENIYAN OLUWASEYI ADEDEJI 070406007 PRESENTED TO THE DEPARTMENT OF METALLURGICAL & MATERIALS ENGINEERING UNIVERSITY OF LAGOS JUNE - NOVEMBER 2010 CERTIFICATION This is
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Chapter 13‚ “Chemical Reactions”‚ was also of great interest to me. “A change that alters the chemical composition of a substance and hence forms one or more new substances is called a chemical change‚ or more often‚ a chemical reaction (James T. Shipman 342).” In this summary paper‚ I will discuss some of the highlights of the chapter. An awesome example of a chemical reaction is that of photosynthesis‚ found in green plants. In photosynthesis‚ plants absorb carbon dioxide gas from the air
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a reducing agent. The reaction forms dehydroascorbic acid and iodide. Ascorbic acid + I2 -> dehydroascorbic acid + 2 H+ + 2 I- However‚ Iodine does not dissolve in water very well. In this case‚ standard solution of potassium iodate(V) is used to produce aqueous iodine. Excess potassium iodide and dilute sulphuric acid is added to react with potassium iodate. KIO3 + 5 KI + 3 H2SO4 -> 3 I2 + 3 H2O + 3 K2SO4 Excess potassium iodide also helps dissolving iodine produced. I-(aq) + I2(s) I3-(aq)
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and Sodium Hypochlorite react are combined the result is green. This means it is a base. F NaOCI and KI When Sodium Hypochlorite and Potassium Iodide are mixed the two combined produced a reddish color. This means the combination made an acidic mixture. When starch is added the mixture turns black. G KI and Pb(NO 3 ) 2 When Potassium Iodide and Lead Nitrate are mixed they produce a yellowish color byproduct that is much thicker than the rest of the reactions. H NaOH and phenolphthalein
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procedure of adding 2 drops into each row of different chemicals with the following chemicals; sodium iodide‚ sodium sulfate‚ sodium chloride‚ sodium bicarbonate‚ sodium carbonate and sodium hydroxide. After all reactions were documented‚ I disposed of all chemicals properly and cleaned
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Experiment 1: Preparation of 1-Bromobutane and Reactivity of Alkyl Halides Objective: The purpose of this lab is to prepare 1-bromobutane from 1-butanol in an acid-catalyzed substitution reaction. While the reaction would be expected to occur as SN2 due to the primary nature of the substrate‚ because H2SO4 is used as a solvent‚ the conditions are very polar and the reaction can proceed via an SN1 reaction. The main objective is to obtain test results to determine the mechanism of the reaction
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Chemicals Vitamin C tablet‚ (1) standard 0.0110 M potassium iodate (KIO3) solution‚ (100 cm3) standard 0.060 M sodium thiosulphate solution‚ (Na2S2O3‚ 160 cm3) 1 M potassium iodide solution‚ (KI‚ 20 cm3) 0.5 M H2SO4‚ (150 cm3) freshly prepared starch solution. Apparatus Titration apparatus Principle In this experiment you are required to determine the vitamin C content of a commercial tablet and compare this with the manufacturers specification. Vitamin C is ascorbic acid‚ which is rapidly and quantitatively
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