Thermodynamics 3

what is the state of the system in the region below the green curve?

• saturated vapor

• saturated liquid

• boiling liquid

• overheated vapor

what is the meaning of the purple vertical segment?

• they represent the specific heat

• they represent the heat of vaporization

• they represent the miscibility gap

• they represent change in concentration between the liquid phase and the vapor phase

on the two sides of this diagram, the two purple segments:

• must be equal

• can be different

• must be different

• can be function of concentration

if we want to compute the total enthalpy of a system (A-B), what is the difference between the ideal case and the non ideal?

• the heat of vaporization

• the enthalpy of mixing

• a term related to the sensible heat

• the heat of fusion

if we mix water and sulfuric acid, the reaction is:

• endothermic

• very esothermic

• the reaction is stable, no heat is exchanged

• very endothermic

if we have an esothermic reaction, the

 $\Delta G_{MIX}$  is:

• positive

• negative

• equal to zero 

• always equal to 1

what is the meaning of the

 $\Delta G_{mix}$  ?

• the sum of the heat of vaporization and the value of the enthalpy along the isotherm

• the difference between the value of the heat of vaporization and the value of the enthalpy along the isotherm

• the sum of the adiabatic value of mixing and the value of the enthalpy along the isotherm

• the difference between the adiabatic value of mixing and the value of the enthalpy along the isotherm

what is the meaning of the yellow line in this diagram?

• the isothermic mixing

• the adiabatic mixing

• the heat of vaporization

• the endothermic mixing

in a T-x diagram (lens diagram): in the biphasic region inside the lens:

• we expect a straight line in the ideal case, but not in the non ideal

• we expect a straight line in the ideal case and also in the non ideal

• we expect an inclined line in the ideal case and also in the non ideal

• we expect a straight line in the ideal case and a curved line in the non ideal case

when we have biphasic equilibrium, we expect that:

• the properties of each phases cannot be considered as additive

• the properties of each phases are additive

• the two phases must be considered as one homogeneous phase

• the two phases has the same properties