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Which of the following is NOT true about gases?

  1. Dec 13, 2007 #1
    Which of the following is NOT true about
    gases?
    1. The volume a gas occupies is directly
    proportional to its molecular weight.
    2. The gas is at STP if it is at 273 K and 1
    atm.
    3. Gases exert pressure on their surround-
    ings.
    4. Gases can expand without limit.
    5. The density of a gas can be increased by applying increased pressure.

    Now I know that 1 is wrong. But I was thinking shouldn't 4 technically be wrong because the gases only expand to fill the container they are in. In other words a gas in bottle can't expand without limit. Is this reasoning correct in any way?
     
  2. jcsd
  3. Dec 13, 2007 #2

    chemisttree

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    If the system is a closed vessel you are correct. If there is no container, they can expand without limit.
     
  4. Dec 13, 2007 #3
    Since it didn't state anything about that. So therefore I have an argument?
     
  5. Dec 13, 2007 #4

    mgb_phys

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    It didn't say there was a container!
     
  6. Dec 14, 2007 #5
    It didn't say that it wasn't in a container. SO...?
     
  7. Dec 14, 2007 #6

    mgb_phys

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    Unfortunately there are two sides to physics.
    1, Understanding the behaviour of the real world - and what maths to apply where
    2, Understanding what exam questions mean.
     
  8. Dec 14, 2007 #7
    Lol. Good thing chem isn't physics. Therefore exam questions shouldn't be ambiguous.
     
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