# Chem111 Flashcards

 PA Partial pressure Thermodynamics is the scientific study of the interconversion and transfer of energy. system is the specific part of the universe that is of interest. surroundings are the rest of the universe open system can exchange matter and energy with its surroundings. closed system can exchange energy with its surroundings, but not matter. An isolated system can exchange neither energy nor matter with its surrounds. The state of a system is defined by the values of a set of relevant macroscopic properties, e.g. temperature(T), volume (V), pressure (P) and composition (nA, nB ...). State functions are variables (or properties) whose values are uniquely determined by the state of thesystem, regardless of how that state was achieved. Equations of state are equations that relate state functions to each other, e.g. the ideal gas equation Energy is the capacity to do work or to produce a change of state in a system. Kinetic energy is energy of motion. Thermal energy is kinetic energy associated with random motions of the components of a system Potential or latent energy is stored energy and is usually associated with the position of an object. Chemical energy is potential energy stored in molecules, most notably within chemical bonds. Internal energy is the total energy within a system. Work is energy transfer due to the action of a force Heat is energy transfer due to a difference in temperature Enthalpy is the heat at constant pressure. Thermochemistry is the study of heat associated with chemical reactions. An exothermic process is one in which heat is lost from the system (at constant pressure). An endothermic process is one in which heat is gained by the system (at constant pressure). An isothermal process is one which the temperature of the system remains constant. State functions P, V, T, U, H, qP, qV, wP Not state functions q, w Change in internal energy ΔU = qV Change in enthalpy ΔH = qP Work wP = -PΔV wV = 0 Boyle's law P1V1 = P2V2 Charles law V1/T1=V2/T2 Avogadro's law V1/n1=V2/n2 Dalton's law Ptotal = PA + PB + PC + ... AuthorMarciaho ID214171 Card SetChem111 Flashcards DescriptionChem Updated2013-04-18T00:30:23Z Show Answers