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27 Cards in this Set

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 Define: Thermodynamics The study of energy and it's transformations. Define: Thermochemistry The relationship between chemical reactions and energy changes involving heat. What is the equation fo kinetic energy? E(k)=1/2mv What is the gravitational constant? 9.8 m/s^2 How is potential expressed? mgh What is the equation for eelectrostatic potential energy? E(el)+kQ(1)Q(2)/d What is the formula for the constant of proportionality? 8.99 x 10^9J-m/C^2 Define: Pressure-Volume Work When gas in does work on it's surroundings. What is the equation for P-V work? w=-P (delta)V Define: Enthalpy Heat flow in chemical reactions occuring at constant pressure when no forms of work are performed other than P-V work. What is the symbol for enthalpy? H What is the formula fr enthalpy? H=E+PV Define: State Function A property of a system determined by the state of the system and not how it got that way. Define: Enthalpy of Reaction The enthalpy change of a reaction. (delta)H=H(products)-H(reactants) If (delta)H is negative, what does that indicate? The reaction was exothermic. Define: Thermochemical Equation An balanced chemical equation the shows the associated enthalpy change. Is enthalpy an extensive or intesive change? Extensive. Explain what the enthalpy change for a reverse reaction. The (delta)H is equal in magnitude but opposite in sign. Define: Calorimetry The measurement of heat flow. Define: Heat Capacity The amount of energy required to raisre it's temperature 1 degree C. Define: Molar heat capacity The heat capacity of one mol of substance. Define: Specific Heat Capacity The heat capacity of 1g of substance. What is the formula for specific heat capacity? Specific heat= q (quantity of heat)/ m (grams of substance) * (delta) T (temperature change) Or q/m*(delta)T What is the equation to find a quantity of heat that a substance has gained or lost? q=Specific heat * m * (delta)T What does Hess's Law State? If a reaction is carried out in a series of steps, (delta)H for te reaction will equal the sum of the enthalpy changes for the individual steps. Define: The enthalpy of formation The enthalpy change associated wth the formation of a compund from it's constitutional elements. Define: Standard enthalpy the enthalpy change when all reactants and products are in their standard state.