Thermodynamics 3 (copy)

what is the 3rd law of thermodynamics

the entropy of all pure crystalline solids at the absolute zero of temperature is zero

what two phase changes does the 3rd law of thermodynamics go under

melting

vaporisation

what system can take account of enthalpy change and entropy change

free energy

what is gibbs free energy

shows the balance between enthalpy and entropy in terms of determining the direction of a process

what will happen to the process if is the change in value of gibbs free energy is less than 0

it will occur

what will happen to the process if the change in value in free energy is greater than 0

process will occur in reverse direction

what will happen to the process if the chnage in value in free energy is 0

reversible

what is the value of the change in energy when a reaction is at equilibrium

0

what is chemical potential

the contribution that component makes to the overall free energy of a system

what is an activity

enable us to quantify how the chemical potential of a pure substance changes when it becomes a component in a mixture

when temprature is increased what happens to the internal energy

also increases

Formulae you need to know:

ΔG = ΔH - TΔS

ΔG = ΣG_products- ΣG_reactants

ΔG=-RTlnK

lnK = -ΔH/R x (1/T) + C

lnK₂ - lnK₁ = -ΔH/R (1/T₂ - 1/T₁)

μ = G/n