calioremetry - Trevor Nestor Period 2 C.P Chemistry Santa...

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Trevor Nestor Period 2 C.P. Chemistry March 24, 2009 Santa Susana High School Determining the change in enthalpy and molar heat of solution for the dissolving of different salts in water through the use of solution calorimetry to explore calorimetry 1
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Introduction In this investigation the change in enthalpy will be determined for the dissolving of various salts in water. Enthalpy, or the heat content of a system, is expressed in kilojoules, and is symbolized by H. Change in enthalpy is symbolized by H. Calorimetry, or the measure of heat flow in to or out of a system, is used primarily to measure the energy content of samples such as foods. (Tatum, 2009) (Doherty, 2009). To find change in enthalpy, measurements will be taken through the use of a calorimeter. A calorimeter is an apparatus that records changes in temperature that occur as chemicals react or dissociate in water. Chemicals that react or dissociate in water make up a system. The water in which chemicals react or dissociate make up surroundings. To calculate heat absorbed by surroundings, the equation “ m x C x Τ ” can be used where “ m ” is defined as mass of water, “C” is defined as specific heat of water, and “ ” is defined as final temperature recorded minus initial temperature recorded. Specific heat is a constant value, and is defined as the amount of heat needed to raise a unit (mole) sample one degree Celsius. (Nave, 2009) Heat absorbed by surroundings is often symbolized as q surr. The heat released by a system is identical to heat
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calioremetry - Trevor Nestor Period 2 C.P Chemistry Santa...

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