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Chemistry 1011

Chemistry 1011. TOPIC Thermochemistry TEXT REFERENCE Masterton and Hurley Chapter 8. 8.2 Measurement of Heat Flow. YOU ARE EXPECTED TO BE ABLE TO: Identify the components and describe the operation of a bomb calorimeter. Calculate q for a chemical reaction from calorimetric data.

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Chemistry 1011

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  1. Chemistry 1011 TOPIC Thermochemistry TEXT REFERENCE Masterton and Hurley Chapter 8 Chemistry 1011 Slot 5

  2. 8.2 Measurement of Heat Flow YOU ARE EXPECTED TO BE ABLE TO: • Identify the components and describe the operation of a bomb calorimeter. • Calculate q for a chemical reaction from calorimetric data. Chemistry 1011 Slot 5

  3. Simple Calorimeter • A calorimeter is an insulated apparatus of known heat capacity • Processes (reactions) can be carried out in a calorimeter in order to measure the heat change that takes place • In an exothermic reaction (the reaction gives out heat) heat flows from the reaction to the calorimeter and the temperature of the calorimeter and contents will rise qcalorimeter is +ve qreaction is –ve qreaction = –qcalorimeter Chemistry 1011 Slot 5

  4. Bomb Calorimeter Some heat is absorbed by the metal as well as the surrounding water. Chemistry 1011 Slot 5

  5. Using the Bomb Calorimeter • Place weighed sample in the bomb • Seal and place in calorimeter; add water • Measure initial temperature; Conduct reaction; Measure final temperature qreaction = –qcalorimeter = – Ccalorimeter x Dt Chemistry 1011 Slot 5

  6. Bomb Calorimeter Calculation Combustion of 1.60 g CH4 in bomb calorimeter raises the temperature by 5.14C (The heat capacity of the calorimeter is Ccalorimeter = 17.2 kJ/C) q reaction = -17.2 kJ/C  5.14C = -88.4 kJ Chemistry 1011 Slot 5

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