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