1- The parameter a in the van der Waals equation is greater for H2O than for He.

Question

1- The parameter a in the van der Waals equation is greater for H2O than for He. What does this say about the nature of the potential energy function for the two gases? Assuming two identical closed containers of equal numbers of moles of H2O and He at the same temperature. How would the pressure in the two containers compares?

Select one:

a. H2O-H2O interaction is less attractive than that of He-He interaction and the pressure inside the H2O container will be larger than that of He-container

b. H2O-H2O interaction is more attractive than that of He-He interaction and the pressure inside the H2O container will be less than that of He-container.

c. None of the above.

2-

Real boundaries (or walls) are never totally adiabatic. Which of the following is the right order in which the walls are increasingly diathermal: Select one:

a. 1-cm-thick vacuum < 1-cm-thick glass < 1-cm-thick cork < 1-cm-thick copper

b. 1-cm-thick vacuum < 1-cm-thick cork < 1-cm-thick glass < 1-cm-thick copper

c.1-cm-thick vacuum < 1-cm-thick cork < 1-cm-thick copper < 1-cm-thick glass

d.1-cm-thick cork < 1-cm-thick vacuum < 1-cm-thick glass < 1-cm-thick copper

3-True/False

a-Consider an open beaker of boiling water in an airtight room. If the beaker's wall is considered the boundary, the system will be considered "open". However, if the walls of the airtight-room were considered as the boundary, the system is "closed".

b-For a given system, heat is considered as an intensive variable, but temperature is an extensive one.

c-In an ideal gas system undergoing an isothermal reversible expansion (P-V space), some of the work will come at the expense of the heat that has been transferred across the boundary between the system and surroundings.

d-In an ideal gas system undergoing an adiabatic reversible expansion (P-V space), all work that is done comes from the increase of internal-energy change (Delta U), and therefore of the temperature.

e-A system in a particular state is not associated with heat or work. Rather, the heat and work exist only during the transitions between states.

Explanation / Answer

1-

a. H2O-H2O interaction is less attractive than that of He-He interaction and the pressure inside the H2O container will be larger than that of He-container

2-

d.1-cm-thick cork < 1-cm-thick vacuum < 1-cm-thick glass < 1-cm-thick copper

3-

-Consider an open beaker of boiling water in an airtight room. If the beaker's wall is considered the boundary, the system will be considered "open". However, if the walls of the airtight-room were considered as the boundary, the system is "closed".=true

b-For a given system, heat is considered as an intensive variable, but temperature is an extensive one.=true

c-In an ideal gas system undergoing an isothermal reversible expansion (P-V space), some of the work will come at the expense of the heat that has been transferred across the boundary between the system and surroundings.=false

d-In an ideal gas system undergoing an adiabatic reversible expansion (P-V space), all work that is done comes from the increase of internal-energy change (Delta U), and therefore of the temperature.=false

e-A system in a particular state is not associated with heat or work. Rather, the heat and work exist only during the transitions between states.=true

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.