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Thread: 3$ and +5 rep for easy 15min assignment

  1. #1

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    3$ and +5 rep for easy 15min assignment

    I am too tired to do this myself.

    video is: http://www.khanacademy.org/science/c...phase-diagrams

    questions are:

    1. What were the two substances the he used as examples for the phase diagram demonstration? check all that apply
    a. methane
    b. carbon dioxide
    c. ethanol
    d. sulfur dioxide
    e. water
    f. ammonia

    2. What locations did he refer to in the video as examples of different pressures? check all that apply

    options: New York, Houston, Denver, the sun, Mars, the moon, Death Valley

    3. Briefly describe a "triple point". in one or two sentences

    4. Is the triple point for all substances the same?

    5. What are the two variables that describe a triple point?

    6. Supercritical water is used to? select one answer

    options: to cool air in a freezer.
    to create flame.
    as a solvent.
    in surgical procedures.
    to make soda.

    7. What is the word he is searching for at the end of the video?



    this should not be tough guys, im pretty sure watching the 12min video would make it super easy.

  2. #2
    Sneaky Sneakz Sneakz's Avatar
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    1 - e. water and b. carbon dioxide
    2. Denver and Mt. Everest and Death Valley and Moon
    3. The triple point is the point at which the compound (in this case CO2) is at a state of equilibrium between the three phases - solid, liquid, and gas. It is able to take on any of the three states if nudged in one direction or the other
    4. The triple point is different for different substances depending on the temperature and pressure needed to make that compound a solid, liquid, or gas.
    5. Temp and pressure
    6.Used as a solvent
    7. deposition

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