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27 Cards in this Set

  • Front
  • Back
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?
What is the gravitational constant?
9.8 m/s^2
How is potential expressed?
What is the equation for eelectrostatic potential energy?
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?
What is the formula fr enthalpy?
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?
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.