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Homework Help: Mixtures, compounds & elements

  1. Sep 25, 2005 #1
    Hi! I'm having trouble answering some questions on a lab I did in class. Any help at all would be greatly appreciated!

    The purpose of the experiemt was to test the differences between pure substances (elements, compounds) and mixtures.
    If the procedure would help, here it is:
    1. Mix equal amounts of iron and sulfur and a piece of paper. Examine the mixture and record observations.
    2. Separate the mixture into two parts.
    3. Put one of these two parts into a test tube and add 4-5 drops of HCl.
    4. Place the second portion in a dish and heat it for approximately 4-5 minutes.
    5. Once cooled down, take a sample from the dish and add a few drops of HCl. Record observations.

    The questions that I have to answer are: Which of the changes that took place in this experiemnt are physical and which are chemical? Why? Which of the substances were elements, which were part of a mixture, and which formed a compound?

    Thank you SO much for any help! :)
  2. jcsd
  3. Sep 25, 2005 #2
    can anyone help me? :confused:
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