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CALORIMETRY OBJECTIVE To conduct heat of combustion and chemical composition measurement tests in order to demonstrate the use of a bomb calorimeter.In addition to this at the end of the experiment we gain some thermodynamical knowledge. APPARATUS Parr 1341 Oxygen Bomb Calorimeter Unit. Ignition Unit. Oxygen Tank. Computer. Data acquisition system. SAMPLE Coke powder (%0.8 S + %1.05 H 2 O+ %? Ash + %? C).We use 0.77 grams of coke powder then we add active carbon to it ;the weight of the sample becomes 0.87 grams We use some wire to conduct our experiment(at the begining nearly 10cm and we use nearly 6.5 cm wire). THEORY Before discuss the related information about the data I want to define some main terms related with our experiment in order to give more brief explanations. The measurement of heat flow is called calorimetry An apparatus that measures heat flow is called a calorimeter The heat capacity of an object is defined as the amount of heat energy required to raise its temperature by 1 K ( or °C ) [6] The heat capacity of 1 mol of a substance is called its molar heat capacity [6] The heat capacity of 1 gram of a substance is called its specific heat [6]
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Here is the another definition of the calorimetry: Calorimetry is the quantitative measurement of the heat required or evolved during a chemical process. A Calorimeter is an instrument for measuring the heat of a reaction during a well defined process.Calorimetric studies are vrey important in our metallurgical and other studies,because with the help of the technological improvements ;it enables us to collect data and maintain samples under conditions that were not previously passible.Now at this point one can wonder what is theme of the calorimetric studies .Here is the corresponding answer. Any process that results in heat being generated and exchanged with the environment is a candidate for a calorimetric study.   We discuss two types of calorimeters: constant pressure calorimeters (involves pressure-volume work) and constant volume calorimeters (does no pressure-volume work). The classification of calorimeters will here be based on three main variables: the temperature of calorimeter, T c , the temperature of surroundings, T s , and the heat, Q, produced per unit time. If T c =T s =constant, and only Q varies we have isothermal calorimeter. A calorimeter in which T c =T s but is not constant as Q varies is called an adiabatic calorimeter. The most
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