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Chemistry Graphs: Distribution of Kinetic Energies

 
This graph shows the relationship between the average kinetic energy of molecules [½(mass)(velocity)2] at two different temperatures. For any given sample of molecules, there is a range of kinetic energies possible; some will have higher kinetic energy, some lower, with the majority of the molecules falling in the middle range.
 
The graph shows that at a second, higher temperature, the molecules in the sample not only have a greater range of kinetic energies, but they also have an overall higher AVERAGE kinetic energy.
 
Emin  is the temperature at which the molecules of a liquid contain enough kinetic energy to change phase, from a liquid to a gas. At the lower temperature, very few molecules have sufficient energy to change phase, but at the higher temperature, all of the molecules in the KE range above Emin contain enough energy to change phase.

General Questions


If we included a third, higher temperature on this graph, how would the peak/shape of the third line compare to the first two?
1. 





What would happen, in the third temperature graph, to the shaded area to the right of Emin?
2. 





Why is the peak on the lower temperature graph taller than the peak on the higher temperature graph?
3. 








G Waller

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