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Thermal Energy lab

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					                                      Thermal Energy (30 pts)
Problem: Which 100 gram substance – lead, brass, or aluminum – at 100 degrees Celsius store the most
         and least thermal energy? (1 pt)

Hypothesis:    I think ____________ will store the most amount of thermal energy and __________ the
               will hold the least amount of thermal energy. (1 pt)

Materials:    ring stand, Bunsen burner, beaker, thermometer, graduated cylinder, lead block, brass block,
              aluminum block, Styrofoam cup, hook, glass stirrer, water (2 pts)

Review Questions: (answer in complete sentences – 2 pts)
   1. What is temperature?
   2. What is heat or thermal energy?

Background: (copy the definition – not the stuff in parentheses – 2 pts)
   1. Specific Heat – the amount of heat required to raise 1 kilogram of a substance 1 degree Celsius.
      (Different substances can store different amounts of heat before changing their temperatures)
   2. Thermometer – A thermometer is used to measure temperature. (Remember the Eureka video)

Procedure:
   1. Add about 150 mL of water to a beaker. Place beaker on ring stand with Bunsen burner. Heat the
      water until it boils. Carefully lower the first block (lead, brass, aluminum) into the water.
   2. While waiting for the water to come back to a boil, (it will lower when you put the blocks in) pour
      50 mL of tap water into the Styrofoam cup. Measure the temperature and record.
   3. Once the water in the beaker is boiling, measure the temperature of the water using the
      thermometer. Assume that the block has the same temperature as the boiling water.
   4. Quickly and carefully transfer the block from the boiling water into the Styrofoam cup. Stir the
      water with the stirrer (not the thermometer) and measure the highest final temperature.
      Record in the data table.
   5. Repeat steps 1-4 for the second and third block.

Data Table: (9 pts)
     Substance                Initial temperature    Final temperature                       Change in
                              of water in cup        of water in cup                         temperature
      Lead
      Brass
      Aluminum

Conclusion: (answer in complete sentences – 2 pts each … #5 is 4 pts)
   1. Which block heated the tap water the most?
   2. Which block heated the tap water the least?                                            Specific Heat
   3. Which block has the greatest specific heat?
   4. Which block has the least specific heat?          50
                                                         Temperature (Celsius)




   5. Create a Specific Heat bar graph with             40
      Substance on the x-axis, temperature on the       30
      y-axis (starting at 0ْC going up to 100ْC)        20

                                                                                 10

                                                                                 0
                                                                                      Lead          Brass     Aluminum
                                                                                                  Substance

				
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posted:6/25/2011
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