lecture16 - Lecture 16 Thermochemistry, part 3 Measuring...

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1 Lecture 16 Thermochemistry, part 3 Measuring Heat Capacity -q aluminum = q water ; q water = nc p T = -q aluminum = nc s T
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2 Calorimetry Calorimetry is the measurement of the change in heat that occurs during a physical change or chemical process. A calorimeter is the device used to measure the absorption or release of heat by a physical or chemical process. Calorimetry:” Bomb” Calorimeter H = -q cal = -C cal T A bomb calorimeter is a device used to measure the heat of a combustion reaction . C cal is heat capacity of the entire calorimeter 1. Calibrate C cal with a known q C cal = q known / T 2. use C cal to find q for new reaction q new = C cal T
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3 Heat of Reaction Heat of reaction is also known as enthalpy of reaction ( H rxn ) and is the heat absorbed or released by a chemical reaction. Values for E, H, etc. depend on the chemical substances For heating, we use heat capacity for the substance(s) and T For work, we use ideal gas volume changes (later…)
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lecture16 - Lecture 16 Thermochemistry, part 3 Measuring...

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