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Something New: Formulas
Formula 1: Heat Energy
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Formula 1: Heat Energy
Formula 2: Acceleration
Formula 3: Kinetic Energy
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H = Heat energy (in Joules)
m = mass (in kilograms)
delta T = change in temperature (in degrees Celsius)
Cp = Specific heat (in J/kg x degrees C)
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Although the discoverer or inventor of the heat energy equation is unknown, the French chemist Antoine Lavoisier was one of the first scientists to be known for using this formula. In the mid 1780's, Lavoisier first used the formula to determine how much heat was given off by an animal. He kept the guinea pig in an enclosed container in order to melt ice and used the heat energy formula to determine his objective.
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Numerical Example:
 
How much heat is required to raise the temperature of 68.0 g of AlF3 from 25.0 degrees Celcius to 80.0 degrees Celcius?
 
Step 1: Consult the chart shown above to obtain specific heat of AlF3
 
Step 2:

heat1.jpg

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Real Life Example:
 
Regina was in the middle of a chemistry lab when she realized that she had to raise the temperature of water from 23.5 degrees Celcius to 85.0 degrees Celcius. If the mass of the water was 854 grams, how could she determine how much heat was needed?

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By using the heat formula, Regina was able to determine that approximately 219,000 Joules were needed to raise the temperature of water from 85.0 C to 23.5 C.

Spring Project
Mr. Drake
Regina Kim
Wendy Kim
Period 2
May 27, 2005