CHEM 112 Lecture Notes - Lecture 24: Chemical Energy, Calorimeter, Thermal Energy
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14 Nov 2018
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Questions 14, 16, 25, 27, 33, 35, 41, 49, 51, 57, 59, 61. Molecular view of endothermic reactions: temperature drops due to absorption of thermal energy, thermal energy comes from surroundings, old"s bonds broken new bonds made. Bomb calorimeter: used to measure delta u because it is a constant volume system, qcalorimeter=-qsystem ex. W=(-m x g)/a x delta h x a. This is based on the piston moving when the mass is hanging from the water bath thing, the amount of gas in the vacuum depends on how high the mass hangs. First law of thermodynamics: energy is not created or destroyed during chemical and physical properties, the energy of an isolated system is constant. Delta u (energy change)= q(heat energy transferred) + w (work done by the system) Internal energy: the internal energy (u) is the total amount of kinetic and potenetial energy a system posseses.
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