Experiments #7A & 7B 7A. Electrochemical Cells 7B. Formation of a Complex Ion Chem 102 Section 3095 Grace H. Kim Dec. 15‚ 2011 Abstract Two experiments were conducted to figure out the value of the formation constant of tetraamminecopper(II)‚ Kf‚ with different methods and which experimental method produces more accurate result. One was electrochemistry using a Daniel cell and the other one was spectrometry by estimating concentration of complex solution using a calibration
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THE COSMETICS INDUSTRY Few cosmetic ingredients are manufactured in New Zealand‚ and the cosmentic industry here involves mainly blending and packaging. However a wide range of products is made by a considerable number of companies. In this article the following products are discussed: • Surfactant mixtures for cleaning - shampoos‚ bubble baths‚ facial scrubs etc. • Stabilised emulsions - moisterisers‚ sunscreens etc. • Concealer products - make up • Alcoholic and hydroalcoholic solutions - colognes
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1.1 DETECTION OF Hg2+ Refer(1) Why is detection of Hg2+ important?? Mercury contamination poses severe health risks. It can enter into environment through natural as well as human activities. Once it enters marine environment‚ bacteria convert inorganic mercury to methyl mercury which enters food chain and is accumulated in large edible fish. Its imbalance can lead to neurological disorders and can cause Minamata disease. Procedure to detect Hg2+ 1. MS1 (Mercury Sensor 1)‚ a water soluble‚ fluorescein
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structure shown in figure 1. Fig. 1 Although the general structure of all amino acids follows figure 1‚ the presence of a zwitterion is made possible due to the basic properties of the NH2 group and the acidic properties of the COOH group. The amine group (NH2) is Lewis base because it has a lone electron pair which makes it susceptible to a coordinate covalent bond with a hydrogen ion. Also‚ the carboxylic group is a Lewis acidic because it is able to donate a hydrogen ion (Kotz et al.‚ 1996)
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Eric Sorenson Chem 461 The Progression of Amphetamine Usage Introduction Amphetamine and other related stimulants stimulants such as methylphenidate are common drugs used to combat physical and mental fatigue. Originally developed for their nasal decongestant abilities these stimulants become a major component in child and adolescent medicine. Why have we seen‚ in the last two decades‚ this street drug known as “speed” become increasingly more prevalent in the younger developing generations
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1 HIGHER SECONDARY MODEL EXAMINATION HSE II Max.marks: 60 CHEMISTRY Time: 2.45 hrs General instructions All questions are compulsory Cool-off time is 15 minutes 1] Defects modify the properties of crystals [4 marks] A] Give differences between Schottky and Frenkel defects [2.0] B] On heating zinc oxide becomes yellow in colour. Why? [1.0 ] C] Alkali metal halides on heating in presence of alkali metal produce characteristic colours.Give reason [1.0] 2] Colligative
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There are two common methods of making nylon for fiber applications. In one approach‚ molecules with an acid (COOH) group on each end are reacted with molecules containing amine (NH2) groups on each end. The resulting nylon is named on the basis of the number of carbon atoms separating the two acid groups and the two amines. These are formed into monomers of intermediate molecular weight‚ which are then reacted to form long polymer chains. Nylon was intended to be a synthetic replacement for
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CHM1002 Synthesis of Benzanilide and Methyl 3-Nitrobenzoate and the Identification of ‘Unknowns’ from Spectroscopic and Physical Properties James Lucas 10394308 23/11/12 Introduction In this series of practicals it was the aim to synthesise both Benzanilide and Methyl 3-Nitrobenzoate. Benzanilide was synthesised using The Schotten Baumann reaction which takes a hydrogen atom from an amino group and substitutes it for an acyl group. For Methyl 3-Nitrobenzoate
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History The development of spandex was started during World War II. At this time‚ chemists took on the challenge of developing synthetic replacements for rubber. Two primary motivating factors prompted their research. First‚ the war effort required most of the available rubber for building equipment. Second‚ the price of rubber was unstable and it fluctuated frequently. Developing an alternative to rubber could solve both of these problems. At first‚ their goal was to develop a durable elastic
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Part 1. Hydrocarbon Nomenclature From International Union of Pure and Applied Chemistry (IUPAC) General Form of IUPAC Nomenclature [branching substituent(s)] Root [Suffix] Rules: 1. Identify the longest continuous chain of carbon atoms. This chain determines the parent name (root) of the alkane. The parent suffix for alkanes is‚ not surprisingly‚ -ane. For chains of equal length‚ pick the one with the most substituents. (Note: I number all possibilities going from left to right
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