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Lab7_Thermochemistry

Lab7_Thermochemistry - C 125 Ex eimntal Che istry 1 pr e m...

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Thermochemistry C125 Prelab C125 Exp er im en tal Che m i st ry 1
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Experimental Purpose Investigate what is meant by : Changes in energy which accompany a chemical reaction Determine : Heat capacity of a styrofoam calorimeter Molar heat of neutralization for a strong and a weak acid
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Important Terms for This Experiment Endothermic Exothermic Mode final temperature ∆T Heat capacity Specific heat Enthalpy Heat of reaction Constant Pressure calorimetry
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Definition of Endothermic Process or reaction that absorbs energy from its surroundings Process or reaction that becomes colder, requiring a gain of energy
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Definition of Exothermic Process or reaction that releases energy to its surroundings Process or reaction that becomes warmer, requiring a loss of energy
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Definition of Mode Final Temperature Peak temperature reached by the system before energy is then lost by the system In this experiment, the energy gained by the system is absorbed from the chemical reaction The temperature change in the system = mode final temperature – initial temperature
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Definition of Heat Capacity (C) The amount of heat required to raise the temperature of a given quantity of the substance in a specific calorimeter by one degree Kelvin C [=] J/K Does not take into account the mass of the substance In this experiment, you will find the heat capacity of styrofoam calorimeter T q C =
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The amount of heat required to raise the temperature of one gram of the substance by one degree Kelvin C SH [=] J/g . K Takes into account the mass of the substance Specific heat of water = 4.184 J/g . K T m q C SH =
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Definition of Enthalpy (Q) A thermodynamic quantity used to describe heat changes taking place at constant pressure Heat flows from warmer to cooler objects Q = mC SH ∆T or C Cal ∆T
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(∆H ) The difference between the enthalpies of the products and the enthalpies of the reactants Also known as enthalpy of reaction ∆H rxn = ∑Q Negative signs indicate heat lost
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Constant Pressure Calorimeter
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