Chem istr y 103 Exam 3 Qu estions and
an sw er s w ith accu r ate
r ationales(PASSED)
Thermochemistry - answer All actions in physical world accompanied by changes
in energy, for example potential to kinetic. All chemical changes and physical
involve energy change and flow. Energy flow associated with feasibility of
chemical reactions. Chemical stability governed by internal energy
E possessed by system - answer Low E, high stability, low IE. High E, low stability,
high IE.
System - answer Initial state to final state. Outside is the surroundings, or the rest
of the universe. Energy flow out is a negative sign. Energy flow in is a positive sign
State function - answer Depends only on final and initial rates, not dependant on
path taken (change in elevation). P, V, T, E, H.
Path functions - answer Depend on path i.e. how the operation is carried out. w, q.
What is temperature? - answer The measurement of particle thermal motion
What is heat? - answer The transfer of energy between bodies at different T
What is work? - answer Force applied over distance
, first law of thermodynamics - answer Total deltaE consists of q transferred to and
work done on a system. DeltaE = q + w
E - answer Energy. A state function. DeltaE = Efinal - Einitial
q - answer Heat. Transfer of thermal E. Path function
w - answer Work. Force acting over distance, also transfers E. Path function
What are the different types of work? - answer Electrical vs mechanical. Pressure
volume relation (w=-P*deltaV)
What are the units for work? - answer L*atm
Calorimetry - answer Experimental measure of heat flow. Relies on property called
heat capacity
What is heat capacity? - answer The amount of heat needed to raise the
temperature of a substance
What are the forms of heat capacity? - answer Molar (C=q/nDeltaT) versus specific
(C=q/mDeltaT). J/molK versus J/gCelsius
an sw er s w ith accu r ate
r ationales(PASSED)
Thermochemistry - answer All actions in physical world accompanied by changes
in energy, for example potential to kinetic. All chemical changes and physical
involve energy change and flow. Energy flow associated with feasibility of
chemical reactions. Chemical stability governed by internal energy
E possessed by system - answer Low E, high stability, low IE. High E, low stability,
high IE.
System - answer Initial state to final state. Outside is the surroundings, or the rest
of the universe. Energy flow out is a negative sign. Energy flow in is a positive sign
State function - answer Depends only on final and initial rates, not dependant on
path taken (change in elevation). P, V, T, E, H.
Path functions - answer Depend on path i.e. how the operation is carried out. w, q.
What is temperature? - answer The measurement of particle thermal motion
What is heat? - answer The transfer of energy between bodies at different T
What is work? - answer Force applied over distance
, first law of thermodynamics - answer Total deltaE consists of q transferred to and
work done on a system. DeltaE = q + w
E - answer Energy. A state function. DeltaE = Efinal - Einitial
q - answer Heat. Transfer of thermal E. Path function
w - answer Work. Force acting over distance, also transfers E. Path function
What are the different types of work? - answer Electrical vs mechanical. Pressure
volume relation (w=-P*deltaV)
What are the units for work? - answer L*atm
Calorimetry - answer Experimental measure of heat flow. Relies on property called
heat capacity
What is heat capacity? - answer The amount of heat needed to raise the
temperature of a substance
What are the forms of heat capacity? - answer Molar (C=q/nDeltaT) versus specific
(C=q/mDeltaT). J/molK versus J/gCelsius
