The following assumptions about molecular behavior are made when working with an
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The following assumptions about molecular behavior are made when working with an ideal gas: The gas sample consists of molecules. These molecules can be thought of as single rigid points in space with mass. The volume of these points is infinitesimal in comparison with the volume of the gas sample or container. · The gas molecules are in constant, random, straight line motion. Curved motion is not possible because there are no attractive or repulsive forces between molecules. · The behavior of the gas molecules can be predicted by Newton's Laws. All collisions between molecules and between molecules and the walls of the container are completely elastic. No energy is lost to friction or heat. The gas molecules have a distribution of speeds and kinetic energies-some move faster than others. The temperature of the gas in Kelvins is proportional to the average kinetic energy of the molecules. 5. Consider the assumptions set forth in the Read This! box. box. Discuss with your group the ma- jor inconsistencies with real gases. In other words, what statements in the Read This! box are less applicable when working with real gases? TOP POGILTM Activities for AP ChemistryExplanation / Answer
The ideal gas assumption says that the molecules do not have intermolecular forces of attraction. In real gases the certainly are intermolecular forces of attraction(IMF) and due to this reason there are deviations we observe from the ideal gas assumption.
As discussed in the Read This, the path of the molecules need not be a straight line motion due to IMF.
Also the kinetic energy of the molecule also depends on the molecule size in real gases.
The assumption says that the collisions are completely elastic. This need not be true in case of real gases. Also there are losses of energy due to friction and other factors.
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