om the US Food and Drug administration(FDA)‚ BPA can possibly cause hazards to foetuses‚ infants‚ and young children. The adverse effects of BPA will be explained in details in plastics No. 7. 1: Polyethylene Terephthalate (PET) – Safe Problem: antimony‚ EA PET are often used to hold soft drinks‚ water‚ juice‚ sports drinks and other drinkable or edible liquids. It is also used in microwavable food trays and oven-friendly thin plastic. This plastic is considered to be safe but there is still risk
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the reaction. One is the necessity to vigorously stir the solution in the conical vial while it is in the reflux condenser. The vigorous stirring is to ensure the interaction between the 1-hexene‚ the HBr‚ and the tetrabutylammonium bromide. Tetrabutylammonium bromide is used as a phase catalyst (one that helps the reactants move into the same phase phase) to help proceed the reaction faster since HBr and 1-hexene are the aqueous and organic phases respectively. The use of a reflux condenser is also
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The Montreal Protocol on Substances that Deplete the Ozone Layer was adopted in 1987 as an international treaty to eliminate the production and consumption of ozone-depleting chemicals. A subsequent amendment created the Multilateral Fund for the Implementation of the Montreal Protocol‚ becoming the first of the multilateral environmental agreements to establish a financial mechanism for implementation. The World Bank has developed a strong partnership with the Multilateral Fund (MLF) since its
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Takayama or hemochromogen test‚ in which ferrous iron from hemoglobin reacts with pyridine to produce red feathery crystals of pyridine ferroprotoporphyrin. Another confirmatory test uses the Teichman reagent‚ consisting of a solution of potassium bromide‚ potassium chloride and potassium iodide in glacial acetic acid‚ and is heated to react with hemoglobin. The reaction first converts the hemoglobin to hemin‚ and then the halides react with the hemin to form characteristic brownish-yellow rhomboid
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6. What is the mass of 3.01 x 1023 atoms of sulfur? 7. What is the mass of 2.41 x 1024 molecules of water? 8. What is the formula mass (molar mass) of ammonium nitrate? 9. How many moles are in 56.2 grams of bromine gas? 10. What is the mass of 2.67 moles of sulfuric acid? 11. What is the mass of 3.5 moles of sodium sulfide? 12. Calculate the mass of 0.354 moles of ammonia‚ NH3. 13. Calculate the mass of 3.54 moles of sodium
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Are you using manual hexadimethrine bromide (polybrene) test in blood cross matching? Watch out! Abstract: BACKGROUND: Blood cross matching test mainly includes manual hexadimethrine bromide (polybrene) test (MPT) and the automatic analyzer method (by coombs card) at the Department of blood transfusion. Generally instrumental method is used for large quantities of samples. It can save manpower; MPT is used for emergency and few samples. it can save time. Our department recently encountered a case
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Renewable and Sustainable Energy Reviews 5 (2001) 343–372 www.elsevier.com/locate/rser A review of absorption refrigeration technologies Pongsid Srikhirin *‚ Satha Aphornratana‚ Supachart Chungpaibulpatana Mechanical Engineering Program‚ Sirindhorn International Institute of Technology‚ Thammasat University‚ PO Box 22 Thammasat Rangsit Post Office‚ Patumthani 12121‚ Thailand Received 11 January 2001; accepted 12 February 2001 Abstract This paper provides a literature review on absorption refrigeration
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million eggs during a single breeding season. The only natural control is a species of diving duck. Hot water will kill zebra mussels (only useful for a very small bilge!). Chlorine will also kill them‚ but is very toxic to marine life. Potassium‚ bromine‚ ozone and ultraviolet light are less toxic alternatives are difficult to apply under water. A novel experiment was reported at the Sixth International Zebra Mussel and other Aquatic Nuisance Species Conference in March 1996.zebra mussel’s are about
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Common Elements/Uses Element Common Uses &/or Descriptions Aluminum A light metal used in making airplanes‚ buildings‚ pots and pans‚ etc. Bromine Used in photography‚ medicines‚ insecticides‚ etc. Calcium A soft‚ metallic chemical element found in limestone‚ marble‚ chalk‚ etc. Carbon Found in coal‚ oil‚ gas‚ living things‚ and inks. Chlorine Used in bleach‚ in chemical to kill germs in swimming pools‚ and found with the element sodium in table salt. Chromium A shiny metal usde on bumpers
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amine groups‚ which are electron-donating. Chlorobenzene contains chlorine‚ which is electron-withdrawing. Phenol contains a hydroxyl group. Oxygen‚ being electronegative‚ was suspected to be electron-withdrawing and hence it took longer time for the bromine to react with benzene. Nitrophenol contains two substituents‚ one of which is a nitro group which is electron-withdrawing. 2.) Sources of error if actual and theoretical doesn’t agree. Contaminated chemical reagents Inappropriate proportions Uncontrolled
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