# Shared Flashcard Set

## Details

thermochemistry
n/a
33
Chemistry
11/10/2011

Term
 thermodynamics
Definition
 study of energy transfer and energy transformationenergy absorbed/released
Term
 energy
Definition
 ability to do work or to supply heat
Term
 work
Definition
 when an object is moved by force over a distance
Term
 heat
Definition
 difference in temperature when applied to energy
Term
 what are the two ways energy is transferred
Definition
 heat and workobjects DON'T CONTAIN HEAT OR WORK!!its internal energy that does
Term
 SI unit for energy
Definition
 joules ??
Term
 kinetic energy
Definition
 1/2 mv^2kg, m/s
Term
 potential energy
Definition
 everything needs to be stable so it goes to kinetic energy
Term
 chemical potential energy
Definition
 interaction between particles in an atomconstant randomn motion so they have a kinetic energy>thermal energyaverage KE is proportional to temp in gas
Term
 system in thermodynamcis
Definition
 something is defined as system and everything else in surroundingssystem is usually reactants and productsenergy transferred between both
Term
 internal energy (U)
Definition
 sum of potential and kinetic energy change U= U final- U inital which is q+wfirst law of thermodynamics>no energy lost
Term
 when heat or work goes into system
Definition
 positive
Term
 when heat or work goes out of system
Definition
 negative
Term
 in endothermic reactions
Definition
 systems absorbs heat so it is positive; energy converted to chemical potential energy
Term
 in exothermic reactions
Definition
 system releases heat so it is negative; energy converted to thermal
Term
 internal energy is what kind of system
Definition
 state function; unique value once the conditions of system have been defined
Term
 geat and work are what kinds of system
Definition
 no state functions bc they depend on the system
Term
 heat of reaction (q rxn)
Definition
 heat transfer at constant temperature
Term
 heat reaction (q rxn) with constant volume
Definition
 qv would just equal Q +Wno work is actually done so all energy is heat
Term
 heat reaction (q rxn) with constant pressure
Definition
 Q= change U +pchange V
Term
 work equation
Definition
 w= -p change V
Term
 enthaply (H)
Definition
 U +PV; heat transfer at constant pressure
Term
 relationship with enthalpy and internal energy
Definition
 changes in both equals each other
Term
 calorimeter definition
Definition
 measurement of quantity of heat
Term
 heat capacity (C) and equation
Definition
 heat required to change the temperature of a system by 1 degree c;c=q/change in T
Term
 molar heat capacity
Definition
 heat required to change the tempeature of system by 1 degree over 1 mole
Term
 specific heat capacity
Definition
 heat capacity of 1 gram of sample
Term
 heat equation with specific heat
Definition
 q= m (specific heat) (change in T)MCAT
Term
 Coffee cup calorimeter
Definition
 same as change H which is q+w; constant pressure
Term
 bomb calorimeter
Definition
 constant volume; can be change in U + p change in V; but normally just q+W
Term
 hess's law
Definition
 enthaply is state function so no matter the order or steps the energy with still be the same
Term
 standard condition
Definition
 reference for thermo.1 atm, 1 M, 25 degree C,
Term
 standard enthaply change
Definition
 enthaply change when all reactants and products are in their standard states
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