Thermodynamics Flashcards
Open system
Matter and energy can be exchanged with the surroundings
Closed system
Energy, but not matter, can be exchanged with the surroundings
Isolated system
Neither matter, nor energy, can be exchanged with the surroundings
Internal energy
Total kinetic and potential energy contained in a system
ΔE > 0
The system is gaining energy
ΔE < 0
The system is losing energy
1ˢᵗ law of thermodynamics
ΔE = q + w
What is q ?
Heat transferred to the system from the surroundings
What is w ?
Work exerted on the system by the surroundings
Endothermic process
q > 0
Exothermic process
q < 0
State function
Function whose value only depends on the current state of the system, not the path taken to get there
Formula of enthalpy
H = E + PV
Difference in enthalpy
ΔH = q(P)
Standard formation enthalpy
Enthalpy needed to form a molecule
