Part a water 3110 is heated until it just begins to

  • Foothill College
  • CHEM 25
  • Notes
  • rmayhoob
  • 24
  • 67% (27) 18 out of 27 people found this document helpful

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Part A Hint 1. How to approach the problem Use the equation that relates heat and temperature: where is the heat, is the mass, is the specific heat capacity, and is the change in temperature. The specific heat capacity, , of water is 4.184 Hint 2. Calculate the temperature change What is the value of the temperature change , C) . ? Express your answer with the appropriate units. Hint 1. Solve the equation for the temperature change Rearrange this equation to isolate the temperature change, T q = m × C × ∆ T : Hint 3. Determine the meaning of What does the variable indicate? T Hint 4. Identify the final temperature of the water At what temperature (in degrees Celsius) does water boil? Express your answer with the appropriate units. J/(g C) T q = m × C × ∆ T T
3/21/15, 7:42 PM Chapters 3 and 4 ANSWER: Correct Part B An unknown substance has a mass of 12.9 . When the substance absorbs 1.161 × 10 2 of heat, the temperature of the substance is raised from 25.0 to 45.0 . What is the most likely identity of the substance? Hint 1. How to approach the problem In this case, the substance can be identified by its specific heat capacity. The specific heat capacity can be determined using the following equation: where is the heat, is the mass, is the specific heat capacity, and is the change in temperature. Once you have determined the specific heat capacity of the substance, compare the value to the data given in the chart in the introduction. Hint 2. Calculate the temperature change What is the temperature change, ? Express your answer with the appropriate units. Hint 1. Determine the meaning of What does the variable indicate? 59.8 C g J C
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Hint 3. Solve the equation for the specific heat capacity Rearrange this equation to isolate the specific heat capacity, : Hint 4. Calculate the specific heat capacity Given that the equation that relates heat and temperature can be rearranged to solve for specific heat capacity, ,

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