Time/Temperature readings 2 Time/Temperature Plot 3 Calculations and Results 3 1) Enthalpy change of gas burned over the duration of the test 3 2) Heat transfer to the water in the kettle (Qw) 4 3) Heat transfer to the water which evaporates from the kettle (Qev) 4 4) Heat transfer to the kettle from initial to final state (Qk) 4 Find‚ as a fraction of 1‚ the values for 2‚ 3 and 4. 4 5) Air–Fuel Ratio 4 6) Enthalpy of combustion with the water formed by the combustion in the gas phase‚ (ΔhcoH2Ovap)
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Borate. Alexis Cervantes and Ak Young. CHEM 114-07 April 30‚ 2024. Introduction The purpose of this experiment was to evaluate thermodynamic values and understand their relationship to equilibrium constants. By measuring the change in enthalpy (H°) and the change in entropy (S°)‚ the equilibrium constant (Ksp) was determined for the dissolution of borax in water. In procedure one of the experiment‚ the temperature of the borax solution was varied and its saturation level was measured at
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SUPPLEMENTARY MATERIAL I Unit V: States of Matter 5.7 KINETIC ENERGY AND MOLECULAR SPEEDS Molecules of gases remain in continuous motion. While moving they collide with each other and with the walls of the container. This results in change of their speed and redistribution of energy. So the speed and energy of all the molecules of the gas at any instant are not the same. Thus‚ we can obtain only average value of speed of molecules. If there are n number of molecules in a sample and their individual
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Hess’s Law Mengyuan Wu (Millie) 7 January‚ 14 Aim: The purpose of this experiment is to determine the enthalpy change for the reaction: Introduction: It is impossible to measure the enthalpy change for this reaction directly because the process cannot be controlled. However‚ you can calculate this enthalpy change by using the Hess’s Law. Pre- lab Calculations: Calculation 1: Required Masses for Reaction The ratio of and is required to be 1:100 for Table 1: Calculation
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SOLTEQ air-conditioning module (Model:HE166-02) which is designed to work with the Base Condensing Unit. The major part of the evaluation procedure is carried out with the aid of psychrometric chart. Thus‚ the heating power‚ cooling power and steam enthalpy can be calculated through the experiment. 2. Introduction & Theory 2.1 Air Conditioning Air conditioning is a system or process for maintaining a living space or industrial facility at the desired temperature and humidity of the air. The SOLTEQ
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Carbon Dioxide Flash-Freezing Applied to Ice Cream Production by Teresa Susan Baker B.S. Mechanical Engineering B.S. Earth‚ Atmospheric‚ and Planetary Sciences Massachusetts Institute of Technology‚ 2003 SUBMITTED TO THE DEPARTMENT OF MECHANICAL ENGINEERING IN PARTIAL FULLFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN MECHANICAL ENGINEERING AT THE MASSACHUSETTS INSTITUTE OF TECHNOLOGY FEBRUARY 2006 © 2006 Massachusetts Institute of Technology. All rights reserved
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the formula Ccal = -(ΔHwater * nLR) / ΔT (eq 1) where ΔHwater is the enthalpy change of water. This is equal to -55.81 kJ/mol. nLR is the number of moles of the limiting reactant‚ and ΔT is the change in temperature associated with the reaction. The Ccal obtained was later used to determine the experimental values of the enthalpy change of the reactions (ΔHrxn). Six other reactions were also used to determine its enthalpy change. The reactions are: Neutralization: a. Ammonia and hydrochloric
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A simple depiction is a hybrid of both of Kekulé’s structures (Scheme 1). In order to confirm the structure of benzene‚ the enthalpy of Kekulé’s structure must be determined and then used to calculate the resonance stabilization energy (RSE) for benzene. If the RSE is greater than zero‚ there is additional stabilization that must come from something besides the enthalpy that corresponds to the isolated double bonds. In modern chemistry‚ this extra stabilization stems from a “resonance hybrid” of
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increases the rate of a chemical reaction by reducing the activation energy‚ but which is left unchanged by the reaction. Entropy: The measure of the disorder of a system‚ usually denoted by the letter S. A highly ordered system has low entropy. Enthalpy: a thermodynamic property of a system. It reflects the capacity to do non-mechanical work and the capacity to release
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SAFETY General WHMIS beforehand – no messing around on anything‚ no food/drink anywhere PPE – goggles‚ coat‚ feet Treatment Skin Chem: emergency shower – TA/HS Eye Chem: eye wash – 10 mins. TA/HS Fire Emergency kill switch for gas‚ electricity and water – leave and set the alarm Stop drop and roll Apparati should be clear of any controls or switches‚ keep vapours to minimum/take need Extinguishers – on the wall inside each 1st year lab Class A - ordinary combustibles
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