thermodynamics Flashcards
what is thermodynamics
direction of processes
what are the three types of system
isolated, closed and open
what is the first law of thermodynamics
energy cannot be created or destroyed only moved/transferred/converted
what does the first law of thermodynamics ignore
preferred direction of a reaction
what is the surroundings
the rest of the universe inContact to a system
what is a system
a part of the universe being focused on
what can closed systems do
exchange energy to the surrounding but not matter
what can an isolated system do
it cannot exchange either matter or energy
what can an open system do
exchange both energy and matter
what is energy
a state of function that depends on the state of the system not the process of how the system got to the state
what are the two types of energy
heat (q) energy transferred by random motion
work (w) energy transferred by organised motion
what is enthalpy change
the heat change of a reaction at a constant pressure
what does enthalpy change reflect
the number and types of chemical bonds in reactants and products
what can enthalpy change be used for
direct measure of energy change
what is the second law of thermodynamics
a spontaneous change in a system that occurs in a direction that increases the combined entropy of the universe to increase
