First law of thermodynamics Flashcards
what is heat capacity of a substance?
amt of TE required to cause a unit rise in temperature of the substance
formula for heat capacity
Q=Cchange in temp
specific heat capacity
thermal energy per unit mass required to raise temperature of substance by 1 unit of temperature
formula of specific heat capacity
Q = mc change in temp
specific latent heat of fusion
amt of thermal energy per unit mass required to convert a solid into liquid at same temp
formula for specific latent heat
Q= ml
internal energy
sum of random distribution of kinetic and potential energy associated with molecules of system
mean ke of particles is also …
temperature
potential energy is due to
work done to move them further apart against the intermolecular attraction
what happens to KE and PE when melting/boiling takes place? [without change in temp]
heat in melting solid:
only increase PE
KE unchanged
for ideal gas, microscopic potential energy is taken to be?
ZER0
For monoatomic ideal gas of N atoms, internal energy =
kinetic energy which also = 3/2 NkT = 3/2pV
1st law of thermodynamics states that …
increase in internal energy of the system is sum of heat supplied and work done on system
formula for 1st law of thermo
U = Q+W
