VOL 20 NO 157 REGD NO DA 1589 Dhaka‚ Saturday‚ May 04‚2013 http://www.fe-bd.com/index.php?ref=MjBfMDVfMDRfMTNfMV8yN18xNjgzMjU= Of disasters‚ negligence and liability: Nimtoli tragedy revisited Published : Saturday‚ 04 May 2013 In case of fire in garment factories and accidents in unauthorized buildings‚ the regulators like the Fire Service or Rajuk come up with arguments that the factories or buildings do not have licence or permission‚ But they cannot avoid the ‘tortfeasor
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°C); however‚ ionic liquids are a unique subset of salts that melt at temperatures below 100 °C and can even be liquids at room temperature. Ionic liquids can be very useful as alternative solvents because of their negligible vapour pressure‚ low combustibility‚ and high thermal stability. Traditional solvents‚ such as ether and hexane‚ have high vapour pressures (evaporate readily). In addition‚ the fumes are an irritant (cause dizziness and headaches) and are highly flammable. Therefore‚ the
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loosely closed stopper. During the heating process‚ sample is observed in order to reveal decomposition‚ sublimation‚ or evolution of water. b. Solubility and Conductance of Solutions Sample is placed in a regular size test-tube with 2 mL of solvent and stirred. It can dissolve immediately‚ partially‚ remain the same or produce a cloudy suspension.
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Water molecules move from high to low Osmosis is what they seem to know Solute and Solvent are what’s inside The polarity of water makes it easy to find “Hyper” and “Hypo” tells you how much is there But isotonic means that they are fair Water molecules move from the inside out Scientists call this plasmolysis without a doubt All of this happens inside a membrane It is a serious matter‚ not a fun little game When a membrane is selective it chooses what it wants Few things are moved through
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Describe an alternative method for evaporation of the CH2Cl2 Can be steamed and then rinsed with ethyl acetate for several hours‚ and then rinsed with water‚ or can be soaked in a bath of CO2 and run through water‚ making carboxylic acid. (2) Caffeine: (4) Repeated exposure can produce general deterioration of health by an accumulation in one or many human organs. First Aid Measures: Eye contact - Immediately flush eyes with plenty of water for at least 15 minutes. Cold water may be used. WARM
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observations to complete the following table‚ rating each system as soluble‚ insoluble‚ or partially soluble. Organic Compound Benzophenone Water Methyl Alcohol Hexane Malonic acid Biphenyl 2. Considering the polarities of the compound and the solvent and the potential for hydrogen bonding‚ answer the following: a) There should be a difference in your results between the solubilities of biphenyl and benzophenone in methyl alcohol. What explains this difference? A. B. C. D. Biphenyl has two rings
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Biological Activities of Paris polyphylla found in Himalayan Region of Nepal Prabin Koirala‚ Khagesh Chataut and Keshab Bhattarai Department of Biotechnology‚ WhiteHouse Institute of Science and Technology‚ Purbanchal University‚ Lalitpur‚ Nepal. e-mail: prabinkoirala122@gmail.com Abstract The study focused on phytochemical and biological analysis of Paris polyphylla (PP). Crude Chloroform/Methanol (1:1) extraction performed on the rhizomes of Paris polyphylla collected from himalayan region
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dilute aqueous sodium hydroxide because the acid is deprotonated by the base producing the sodium carboxylate salt. RCO2H(solv) + OH–(aq) → RCO2–(aq) + H2O(aq) The carboxylic acid can be selectively isolated by dissolving the mixture in an organic solvent that is immiscible with water‚ and then extracting the solution with sodium hydroxide. The basic aqueous solution containing the carboxylate salt is acidified‚ causing the sodium carboxylate salt to convert back to the carboxylic acid‚ which is not
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objective of the experiment was the extract an acid‚ a base‚ and a neutral compound from a 2:1:1 compound of benzoic acid‚ p-nitroaniline‚ and azobenzene. In theory‚ an extraction technique based on phase distribution should allow two immiscible solvents to separate with a portion of the solute distributed into each. Using a separatory funnel‚ acids were extracted with bases (NaOH)‚ and bases were extracted with acids (HCl). Gravity filtration‚ cold filtration‚ and hot filtration were all used
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Tiruchirappalli – 2. Using a perkin Elmer spectrophotometer system. Were used at wavelength from 400 to 800 nm due to sharpness of the peaks and proper baseline. The profile showed the peaks at 422 and 644 nm with the absorption of respectively solvent. Sahaya Sathis‚ S et al.‚ (2012). 3.17 Fourier Transform Infrared Spectroscopy (FT- IR) The FT – IR spectrum was used to identify the functional group of the active components based on the peak values in the region of infrared radiation. FT - IR analysis
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