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09 - the amount of heat required to raise the T of 1 g of...

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Chapter 9 9/1/09 How do we measure these thermodynamic quantitities? Calorimeter : an insulated device that can be used to determine the heat change associated with a chemical or physical process 1) Constant pressure calorimeter 2) Constant volume calorimeter For both types reaction of interest is carried out, and the temperature of the calorimeter is measured Note: Because the conditions are different, the value of T measured for these 2 types of calorimeters are different Coffee cup calorimeter constant pressure calorimeter Inner cup contains the reaction being investigated Outer cup provides extra insulation Both cups are used to prevent heat transfer to the surroundings Constant pressure calorimeter reactants are added quickly and the temperature of the solution is monitored Specific heat
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Unformatted text preview: : the amount of heat required to raise the T of 1 g of material 1 C For equivalent masses, different materials will require differing amount sof heat to raise the temperature Constant P calorimeter is not convenient for making measurement sof reactant where one or more reactants/products are gases Bomb calorimeter: Steel bomb chamber Safety-tested for specific Ps Reactants in sample cup (Reaction chamber) Water (Known volume) Insulating container Stirrer Ignition wires Thermometer The Bomb calorimeter heat gained or lost corresponds to q v The change in internal E is equal to the heat gained or lost by the system at constant volume P We must ascertain the change in volume that would result from a reaction carried out at constant P...
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