CHEM 122 Lecture Notes - Lecture 2: Calorimeter, Heat Capacity, Sodium Hydroxide
17 Aug 2016
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Using energy produced in reaction to find dh. If temperature increases, reaction gives energy and is exothermic. If temperature decreases, reaction absorbs energy and is endothermic. 1. calculate amount of energy involved from info and amounts given. 2. relate moles reacted to energy value calculated (check for limiting reagent for the actual amount of product in the reaction) The bomb calorimeter is an insulated heat chamber in which heat experiments are done. Reaction chamber surrounded by water (with a thermometer to note changes in temperature) A stirring mechanism that distributes heat in the water. In our labs we will use styrofoam cups. In calorimeter, no heat is lost which is impossible with styrofoam cups. will be lower because of heat lost. Error associated with measuring temperature is at best . This translates to significant error range in final calculation. If calorimeter is used to measure the heat energy of a reaction, the heat absorbed the calorimeter must be added into calculation:
