why water has low vapour pressur and high surface tension Ok‚ well the answer to your first question is hydrogen bonds. Water has high surface tension and low vaporization temp because the hydrogen bonds in water make strong dipoles that are difficult to separate (yielding high surface tension) and greater energy to overcome when vaporized. study help site http://ocw.mit.edu/courses/physics/8-01-physics-i-classical-mechanics-fall-1999/syllabus/ Explain gas laws through KMT acc to k.m.t gasses
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Molecular modelling is the general term used to describe the use of computers to construct molecules and perform a variety of calculations on these molecules in order to predict their chemical characteristics and behaviour. The term molecular modelling is often used synonymously with the term computational chemistry. Computational chemistry is a broader term‚ referring to any use of computers to study chemical systems. Some chemists use the term computational quantum chemistry to refer to the use
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ventilate-tube of the ejector and gets compressed. The temperature and pressure rises considerably and fed to the water cooled condenser where it gets condensed. Analysis of Steam Jet Refrigeration System: - The temperature – entropy (T– s) and enthalpy-entropy (h – s) diagrams for a steam jet refrigeration system are shown in fig. (a)
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Name : ……………………………………………………………….. Date Due : …………………………………………………………….. Year 12 80% A 70% B AS Level Chemistry 60% C 2008 – 2009 50% D 40% E Below U Questions on % Haloalkanes 2.8 32 1. Chloromethane can be prepared by a reaction between methane and chlorine in the presence of ultraviolet radiation. (i) Outline the mechanism for this reaction. .....................................................................................
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N12/4/CHEMI/SPM/ENG/TZ0/XX 88126104 CHEMISTRY standard level Paper 1 Friday 9 November 2012 (afternoon) 45 minutes INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question‚ choose the answer you consider to be the best and indicate your choice on the answer sheet provided. • The periodic table is provided for reference on page 2 of this examination paper. • The maximum mark for this examination
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logic controller with tuning mechanism via output scaling-factor method for HVAC system. The developed HVAC controller is specifically applied to Air Handling Unit (AHU) upstream process where mixing dampers are modulated to provide a lowest enthalpy of airstream entering AHU downstream process. This method is expected to improve HVAC performance that is measured in terms of thermal comfort level in the space it serves and the energy it consumes. The main function of HVAC is to overcome
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Division Ave. High School Ms. Foglia AP Biology Metabolism & Enzymes AP Biology 2007-2008 Forms of Energy Energy Is the capacity to cause change Exists in various forms‚ of which some can perform work Kinetic energy Is the energy associated with motion Potential energy Is stored in the location of matter Includes chemical energy stored in molecular structure AP Biology 1 Division Ave. High School Ms. Foglia AP Biology Energy
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1. Air in a room is at 220C d.b. and RH = 60%. Find the following conditions from the psychrometric chart: specific volume‚ dew point‚ specific enthalpy‚ wet-bulb temperature and moisture content. 2. Outdoor air at 0 0C d.b. and 100% saturation is heated with a low-pressure hot-water battery to 30 0C d.b. Identify all the condition data for both entry and exit states. 3. Re-circulated room air at 21°C d.b.‚ 50% saturation is mixed in equal amounts with summer outdoor air at 31°C d.b.‚ 22
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Heat exchanger A heat exchanger is a device that is used to transfer thermal energy (enthalpy) between two or more fluids‚ between a solid surface and a fluid‚ or between solid particulates and a fluid‚ at different temperatures and in thermal contact. In heat exchangers‚ there are usually no external heat and work interactions. Typical applications involve heating or cooling of a fluid stream of concern and evaporation or condensation of single- or multicomponent fluid streams. In a few heat exchangers
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pubs.acs.org/joc Mechanism and Regioselectivity of the Osmium-Catalyzed Aminohydroxylation of Olefins Dominik Munz and Thomas Strassner* Physikalische Organische Chemie‚ Technische Universit€t Dresden‚ Mommsenstrasse 13‚ 01062 Dresden‚ a Germany thomas.strassner@chemie.tu-dresden.de Received November 12‚ 2009 The mechanism and regioselectivity of the osmium-catalyzed aminohydroxylation of olefins was investigated in detail by density functional theory (B3LYP/6-31G(d)) calculations in
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