Chemistry 1302A/B Lecture Notes - Lecture 4: Calorimetry, Exothermic Process, Bond-Dissociation Energy
30 Dec 2018
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Enthalpy is defined at the change in heat at a given pressure. Enthalpy is a combination of internal energy and work. Standard conditions: 101. 3 kpa and 298. 15 k (25 c) There are certain values given per substance to perform certain physical processes. The latent heat capacity of ________ is the amount of energy you need to perform that physical process. The latent heat capacity of melting is the amount of energy you need to change water into ice. Enthalpy change difference in absolute enthalpies between products and reactants. We coin subscripts of delta h based upon reaction names (ie neutralization) Energy is always conserved heat lost/gained by system = heat gained/lost bu surroundings. It"s the chemical reaction that we are studying. Endothermic is a reaction that absorbs heat from the surroundings. Exothermic is a reaction that gives off heat into the surroundings. Assume for now that the surroundings = solution only (calorimeter apparatus = negligible)
