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Topic Topic: Size of molecule does not change during compression of gas Post ReplyNew Question
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Joined: 26 June 2005
Posts: 918
Posted: 20 July 2005 at 11:42am | IP Logged Quote System

Gas confined within a container is compressed quickly. Which of the following remains constant?
    A.   Gas density
    B.   Size of gas molecules
    C.   Gas temperature
    D.   Separation distance of gas molecules
    E.   Collision frequency of gas molecules
 QUIZ QUESTION #315 created by Beka on 19 July 2005 at 1:39pm

Correct answer: B    Correct clicks: 50.00%  Wrong clicks: 50.00%
    A.   [32 clicks 20.51%] 
    B.   [78 clicks 50.00%] 
    C.   [27 clicks 17.31%] 
    D.   [10 clicks 6.41%] 
    E.   [9 clicks 5.77%] 
Please discuss this quiz question.
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Joined: 26 June 2005
Posts: 27
Posted: 23 July 2005 at 8:16pm | IP Logged Quote Beka

Because of the compression ...

  • Gas density increases because gas mass remains constant while its volume decreases.
  • Gas temperature increases because the compression is non-gradual (fast). Equilibrium is not achieved at every stage of the compression - hence heat is not dissipated.
  • Separation distance of gas molecules decreases because compression reduces space while number of molecules is constant.
  • Collision frequency increases because of 2 factors: separation distance is smaller; and molecules move faster at higher temperatures.

The only constant is the size of the gas molecules.


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