1. Introduction In the study of Thermochemistry‚ reactions are quantitatively analyzed to determine the amount of heat that has been transferred‚ whether released or absorbed‚ between the system and its surroundings. Such data is important in realizing the properties of different types of reactions along with the elements and compounds of which they are comprised. However‚ it can be difficult to derive the exact enthalpy in a reaction when multiple processes occur simultaneously. A method
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Unit of energy Metry : Measurement Calorimetry : • Measurement of energy Energy : The ability to do work Types of Energy : Kinetic & Potential Movement Stored Heat Chemical Energy Laws : Laws of thermodynamics 1st Law : Energy cannot be created or destroyed‚ only transferred‚ or transformed 2ed Law : When energy is transformed or transferred‚ it becomes less useful ( "Lost" as heat ) Energy : energy flows like water
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objectives of this experiment are to. . . ! ! determine changes in enthalpy and entropy of the reaction of zinc with copper sulfate using two methods: electrochemistry and calorimetry. compare the enthalpy values obtained by the two methods. BACKGROUND Thermodynamics is concerned with energy changes that occur in chemical and physical process es. The enthalpy and entropy changes of a system undergoing such processes are interrelated by the change in free energy‚ ªG‚ according to the equation ªG =
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required to charge the cylinder and exhaust the products of combustion also would be considered. Owing to these complexities‚ accurate modeling of reciprocating internal combustion engines normally involves computer simulation. To conduct elementary thermodynamic analyses of internal combustion engines‚ considerable simplification is required. One procedure is to employ an air-standard analysis having the following
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CHM130 Lab 4 Calorimetry Name: Data Table: (12 points) ALUMINUM METAL Pre-weighed Aluminum metal sample mass (mmetal) 20.09 g Temperature of boiling water and metal sample in the pot (Ti(metal)) dsdfa(Ti 99°C Temperature of cool water in the calorimeter prior to adding hot metal sample (Ti(water)) 24°C Maximum Temperature of water/metal in calorimeter after mixing (Tf) 28°C LEAD METAL Pre-weighed Lead metal sample mass (mmetal) 20.03g Temperature of boiling water and metal sample
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Glossary: Oscillations: a repetitive back-and forth motion Free oscillations: no energy loss or gain Simple harmonic motion: acceleration directed towards a fixed point‚ and acceleration proportional to distance from the fixed point. Thermodynamics and ideal gas 1.State the basic assumptions of the kinetic theory of gases. -atoms behave as elastic spheres -volume of atoms negligible compared to volume of containing vessel -time of collision negligible to time between collisions
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2013/07/09 Lecture Presentation Chapter 5 Thermochemistry John D. Bookstaver St. Charles Community College Cottleville‚ MO © 2012 Pearson Education‚ Inc. Energy • Energy is the ability to do work or transfer heat. – Energy used to cause an object that has mass to move is called work. – Energy used to cause the temperature of an object to rise is called heat. Thermochemistry © 2012 Pearson Education‚ Inc. 1 2013/07/09 Kinetic Energy Kinetic energy is energy an object possesses
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investigate the situation of a two opposing jets. One jet is fuel‚ the other is oxidizer. A specified distance of 1 cm separates the exit of both streams. We limit this investigation to one fuel‚ namely methane and one oxidizer‚ atmospheric air. The calculations are performed at atmospheric pressure and a prescribed reactant temperature of 533 K. A baseline jet exit velocity of 20 m/s for both jets is used. At first a basic understanding of the opposing diffusion flame structure will be developed with the
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Determination of the Resonance Stabilization Energy of Benzene Using Bomb Calorimetry Kaitlynn‚ Jesse ‚ Belinda Truman State University Abstract The resonance stabilization energy of benzene is investigated by the combustion of cyclododecatriene. The heat of combustion for cyclododecatriene was determined using bomb calorimetry and used to solve for the stabilization energy of benzene. The bond stabilization energy of benzene is found to be 167.6 ± 388
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larger area that must be decontaminated. 13. As a process occurs‚ ∆Suniv will increase; ∆Suniv cannot decrease. Time‚ like ∆Suniv‚ only goes in one direction. 14. This reaction is kinetically slow but thermodynamically favorable (∆G < 0). Thermodynamics only tells us if a reaction can occur. To answer the question will it occur‚ one also needs to consider the kinetics (speed of reaction). The ultraviolet light provides the activation energy for this slow reaction to occur. 15. Possible arrangements
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