Chemistry 1011 TOPIC TEXT REFERENCE Thermochemistry

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Presentation transcript:

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

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

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

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

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