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An egg is fried in a skillet, a chemical or physical properties?

  1. Sep 22, 2008 #1
    Please help urgent

    Please help, I have few questions

    1.Natural gas burns with a yellow flame, a chemical or physical properties?

    2.An egg is fried in a skillet, a chemical or physical properties?

    3. When iron is dissovled into a acid. Has the iron atoms destroyed? Give answers with why?

    4.A particular compound is thought to be a pure compound. Analysis of three
    samples of the material yield the following results.
    Mass of sample Mass of carbon Mass of hydrogen
    Sample 1 1.000 g 0.937 g 0.0629 g
    Sample 2 0.244 g 0.229 g 0.0153 g
    Sample 3 0.100 g 0.094 g 0.0063 g
    Could the material be a pure compound?
    I really dont understand this question
     
  2. jcsd
  3. Sep 22, 2008 #2

    CompuChip

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    Re: Please help urgent

    Welcome to PF, someone21.

    All chemics is physics. So physical is arguably always the right answer.
    For the rest, please read this thread first, especially point 1 and 2.
     
  4. Sep 22, 2008 #3

    Borek

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    Staff: Mentor

    Re: Please help urgent

    Asking someone to follow forum rules doesn't work, I have tried that at chemicalforums last Wednesday.
     
  5. Sep 22, 2008 #4

    GCT

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    Re: Please help urgent

    Find the relative mole values and the empirical formula , if the three samples have distinct empirical formulas than you have a crude substance if they are the same then the probability is that you have one compound.
     
  6. Sep 22, 2008 #5

    Borek

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    Staff: Mentor

    Re: Please help urgent

    No need for that, just comparing percentage composition will be enough.
     
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