Specific Heat of an Object - Yahoo Voices

September 6, 2013 – 11:09
Temperature Change and Heat Capacity

In this lab the goal was to determine the specific heat of an unknown metal to determine what terrorist group made an airplane crash. Only a small sample of the metal from the incendiary device was provided so we only had one sample that could be used for testing. We had to determine the specific heat of the element we were given, either lead, zinc, aluminum, or iron and compare the results to their actual specific heats. We had to observe at least one other physical property of the given element and compare it to the known elements to give further evidence of our conclusion. Specific heat is the measure of how much heat energy is needed to increase the temperature of an object by a unit, in this lab the unit is Celsius. Our hypothesis was that tare sample, a dull colored silver object would most likely be iron. Through testing the specific heat of this object, determining the density, and observing it's magnetic properties we were able to determine what the substance was and find out which terrorist group made the bomb. This hypothesis seemed logical to us as there were four metal sand we had to look at their properties and iron seemed to fit in better than lead, zinc, or aluminum.

Materials

Lab safety equipment (Glasses, apron, oven mitt gloves)

  • 600 ml Beaker

  • Hot plate

  • Copper

  • Unknown element either lead, zinc, aluminum, or iron

  • 50 ml beaker

  • 460 ml water (400 in large beaker, 20 in small beaker, 40 ml in calorimeter)

  • Magnet

  • Large test tube

  • Rubber stopper

  • Electronic scale

  • Calorimeter

  • Thermometer

  • Graduated cylinder

  • Paper towels

  • Test tube stand

  • Ring stand

  • Procedure

    Put all lab safety equipment on.

    Obtain all of the materials.

    Set up ring stand and place large test tube in ring stand.

    Pour 400 ml water in large beaker, place on hot plate

  • Start the hot plate

  • Take the mass of the metal pieces with the small beaker

    Take mass of small beaker without metal pieces

    Determine the mass of the metal pieces.

    Place 20 ml in small beaker

    Place metal pieces in small beaker, record the volume.

    Determine the density of metal D=M/V.

    Place metal pieces in large test tube. ( Water most likely won't be boiling so there is no risk of injuring yourself from steam)

    Once water is boiling lower ring stand placing test tube in boiling water.

    Allow test tube to sit in boiling water for 10-15 minutes.

    Use oven mitt gloves to take test tube off ring stand.

    Place hot metal pieces in calorimeter.

    Use thermometer to get temperature recording of hot metal pieces in 40 ml of water.

    Determine the specific heat of metal.

    Repeat lab 1 more time with known metal, copper, and do 3 times with unknown metal.

    Source: voices.yahoo.com

    SPECIFIC HEAT SPECIMAN
    Single Detail Page Misc ()
    • Set of five metal cylinders with hooks: aluminum, copper, iron, lead and zinc, each 15mm in diameter and 100 gm weight.
    • Cylinders vary in length.
    • Actual Weight: 1.2 .lbs

    I always assume reasonable honesty

    2009-10-31 13:28:20 by itfitzme

    The article you reference is written by "William DiPuccio was a weather forecaster for the U.S. Navy, and a Meteorological/Radiosonde Technician for the National Weather Service."
    The title of the post is with regard to the IPCC model.
    The article, not a journal paper or a study, talks about the GISS ocean model.
    I generally assume that the post will accurately reflect the articles sited and follow good logic.
    The more deeply I follow into this thread, the more I recognized something a bit disingenuous.

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