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Simple calorimetry lab, thermodynamics

  1. Nov 14, 2012 #1
    1. The problem statement, all variables and given/known data
    So I did an experiment today.
    The procedure is very simple.
    First I got a styrofoam cup with a lid, filled it with 50.00ml (V1) of water, assum density ρ = 1.0 g/ml
    Then measured the temperature of the water. T1
    After that, I added 2-3 small pieces of ice, close the lid quickly. stir till all the ice dissolved, the temperature at first decreased and stay constant for a brief moment and finally rose up again.
    I recorded the lowest temperature T2 this is the final temperature for both the ice and the water

    Last thing I did was measuring the final volume of the ice + water (V2)

    2. Relevant equations 3. The attempt at a solution

    These are the series of question (no need for data)
    1. what happened to the temperature of the liquid water when ice was added?
    It decreased.

    2.What happened to the ice? it melted.

    3.State the physical processes taking place when ice is added to liquid water.
    The only process was the fusion of ice.

    4. What two components gain heat when ice is added to liquid water?
    The only thing i can say is that pieces of ice gain heat. what is the other thing that could have possibly gain heat beside the ice?

    5.Express (4) mathematically. (Use symbols)
    I have no idea what they want.
    Are they asking for this: Q = mcΔT
    m here is the mass of the ice (V2 - V1)
    ΔT will be the change in temperature of ice from 0°C to T2
    c is just the heat capacity

    6. What loses heat when ice is added to liquid water?
    The original amount of liquid water lost heat.

    7. Express (6) mathematically.
    Similar to (5)
    Q2 = mcΔT
    m here is the mass of the water V1
    ΔT will be the change in temperature of water from T1 to T2

    8. Express (5) and (7) in the form of the general equation:

    qgain = -qloss

    for this part, do I just need to plug in the 2 equations?

    Sorry for the long post.
    Thanks for your time.
     
  2. jcsd
  3. Nov 15, 2012 #2

    Borek

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    Staff: Mentor

    I don't like this question, but I guess what they mean is that not only ice melted, but also something happened to the water produced during melting.
     
  4. Nov 15, 2012 #3
    I just thought about that this morning also =)
    So heat was added for the solid to turn liquid, and then heat was gained by the newly form liquid water =)

    And what about the other parts of this report? Did I get them right?

    Thanks for your time.
     
  5. Nov 15, 2012 #4

    Borek

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    Staff: Mentor

    One other thing caught my attention - ice did not dissolve, it MELTED.
     
  6. Nov 15, 2012 #5
    haha, i am not sure if that is the write term here, it was used in the lab manual :)
     
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