barbital in 825 g of acetic acid? Kb = 3.07°C/m‚ boiling point of pure acetic acid = 117.9°C 5. When 0.55 g pure benzoic acid (C7H6O2) is dissolved in 32.0 g of benzene‚ the freezing point of the solution is 0.36C lower than the freezing point value of 5.5C for the pure solvent. (a) Calculate the molecular weight of benzoic acid in benzene. (b) Use the structure of the solute to account for the observed value: 6. Biochemists have discovered more than 400 mutant varieties of hemoglobin (Hb)
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adsorption. It is a surface phenomenon. (e.g.) H2 adsorption over nickel. The solid material is known as adsorbent. (e.g.) Nickel‚ Silica gel‚ Charcoal‚ Zeolite The gaseous or liquid molecules are adsorbate (e.g.) H2 gas‚ Bromine‚ benzene‚ water vapour For gases‚ a special name is given as “occlusion’ 2.If the concentration is of bulk phenomenon‚ it is absorption. (e.g) Absorption of water by anhydrous CaCl2. 3. Adsorption and absorption process are collectively known as
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Extraction and analysis of two compounds from unknown solution C ABSTRACT Liquid C and solid C were both extracted from unknown solution by first using chemically active liquid-liquid extract‚ followed by vacuum filtration. Liquid C and solid C were then purified with the use of simple distillation and recrystallization respectively. Through the process of recrystallization‚ the percentage purity of solid C was found to be 6.01%. The melting point range of purified solid C was 117.0 – 119
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ChE-309 Chemical Engineering Laboratory-I Laboratory Manual Second Edition (2001) Edited by S. U. Rahman Department of Chemical Engineering King Fahd University of Petroleum & Minerals Dhahran-31261‚ Saudi Arabia Preface This laboratory manual is prepared by the department of chemical engineering for Chemical Engineering Laboratory-I (ChE-309). It is divided into three sections; namely‚ Fluid Mechanics‚ Heat Transfer and Mass Transfer. The purpose of this manual is to serve as instructional
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fresh water during the first tapping of the well and 1-7 million gallons of fresh water during subsequent drillings (Steingraber 271). The fresh water is then mixed with about 10‚000 – 40‚000 gallons of chemicals. Chemicals‚ such as benzene‚ toluene‚ ethyl benzene‚ arsenic and xylene‚ contaminate the water and make it highly toxic to humans‚ animals and wildlife (Fox). Dr. Theo Colburn‚ a well respected‚ award winning Professor at the University of Florida and President of TEDX (The Endocrine Disruption
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Chemical Engineering and Processing 46 (2007) 774–780 Reactive distillation: The front-runner of industrial process intensification A full review of commercial applications‚ research‚ scale-up‚ design and operation G. Jan Harmsen a‚b a Shell Global Solutions‚ Shell Research and Technology Center Amsterdam‚ P.O. Box 38000‚ 1030 BN Amsterdam‚ The Netherlands b RijksUniversiteit Groningen‚ Nijenborgh 4‚ 9747 AG Groningen‚ The Netherlands Received 19 June 2007; accepted 20 June 2007 Available
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which are mainly toxic. These chemicals are certainly harmful to the health and the environment. The chemicals used to make tgese plastic bags are toxics that are sources of various diseases and disorders in humans such as xylene‚ ethylene oxide‚ and benzene. They also have negative effects on the air‚ livibg organisms (plants) and water. There are two major methods that release the toxic chemicals in the plastic bags which are burning and throwing. Many people‚ im pretty sure have thrown plastic bags
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guidelines. (www.sphtc.org/timeline/timeline.html). China’s water population had caused thousands of dead pigs floating past Shanghai‚ dramatic though they are‚ may be the least of China ’s water pollution worries. In January‚ a chemical accident leaked benzene‚ a known cancer-causing agent‚ into a tributary of the Huangpu River (where the dead pigs were discovered). More than 20 people were hospitalized as a result‚ according to the Wall Street Journal‚ and area residents were forced to rely on fire trucks
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Tapped In the documentary “Tapped” many items are discussed about bottled water companies and how they operate. The films shows how companies are making huge profits off of water from public waterways and how these companies are making cool‚ refreshing bottles of water not so safe or refreshing. The film begins telling about the bottle water company‚ Nestle‚ coming in‚ building a factory‚ and producing many jobs for small areas. So far nothing at all seems wrong with this process. However
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zinc) heterogeneous 3. Which compounds are water soluble? a. sodium nitrate (NaNO3) yes b. methane (CH4) no c. potassium bromide (KBr) yes d. carbon tetrachloride (CCl4) no 4. Which pairs of compounds will form a solution? NEED HELP a. benzene (C6H6) and hexane (C6H14) b. NaCl and hexane (C6H14) c. sodium sulfate (Na2SO4 ) and water (H2O) d. Water (H2O) and xarbon tetrachloride (CCl4) 5. Why does a soft drink become “flat” faster when it is left open at room temperature compared to
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