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Challenge: Problem 3

In Van der Waals' equation of state for actual gases we have two factors:

and (V - b), where a and b are constants for the particular gas system - P is sometimes called the "reduced pressure", and (V - b) is called the "effective volume". What do the two factors suggest about the behaviour of matter and, from that, what do you think can be inferred (guessed) about the properties of gases and what is contained in them? Construct your answer from the items on the RESPONSE ARRAY.

1
the systemic relationship PV = RT 2
a decrease of temperature 3
internal energy a function of temperature only 4
the inversion temperature of a gas: in going from a high pressure region to a low pressure region a gas can cool if it starts below the inversion temperature 5
reduction of pressure

6
the condition of a liquid 7
increase of volume 8
the specific heat does not vary with temperature 9
absolute temperature T 10
the number of molecules in one gram molecule of any gas is a constant (Avogadro's number)

11
ionization of the gas 12
adiabatic change of state 13
the walls of the enclosure of the gas consist of molecules 14
attractive forces between molecules 15
shape of molecules

16
finite size of molecules 17
internal structure of molecules 18
average kinetic energy of molecules 19
repulsive forces between molecules 20
the magnitude of the internal energy when T = O