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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 10^9Jm/C^2


Define: PressureVolume Work

When gas in does work on it's surroundings.


What is the equation for PV 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 PV 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.
