5 - Thermochemistry

5 - Thermochemistry - Thermochemistry Energy heat Uses and...

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Click to edit Master subtitle style Thermochemistry Energy, heat: Uses and implications
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Energy Energy is actually like pornography: easy to  recognize but hard to define. Energy  is sometimes defined as the capacity to do  work. Work  is the result of a  force  acting over a  distance.
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Some Types of Energy 1. Light 2. Gravitational 3. Potential 4. Kinetic/mechanical 5. Chemical 6. Electrical 7. Magnetic 8. Heat – waste energy
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It’s not what you say, it’s what you  do… Often easier to see the effects of energy than the  energy itself… One of the easiest things to understand (especially  during a Rochester winter) is “heat”.
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Heat Heat is actually waste energy from an engineering  standpoint.  It is energy that doesn’t go into making the car  move, or bonding the atoms together. Heat simply raises the temperature of materials. On the molecular level, it is energy that makes the  molecules move around faster.
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Kinetic Theory of Temperature Within this model, “temperature” is actually a  measure of the median kinetic energy of the  molecules. # of molecules Energy of molecules Median K.E. T
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Absolute vs. Relative Temperature Kinetic Energy is energy of motion.  The faster a  given object travels, the more KE it has. # of molecules Energy of molecules Median K.E. T Low temp High Temp
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Absolute vs. Relative Temperature Fahrenheit, Celsius, Kelvin All different temperature scales. You could define your own.  Find two  temperatures (body temperature, melting point of  sugar), divide up the difference between them  into arbitrary units and you’re done!
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Absolute vs. Relative Temperature Fahrenheit, Celsius were made just that way –  picking two arbitrary temperatures and dividing  the difference between them into arbitrary units. These are “relative” temperature scales. Relative scales work fine: higher temperature is  “hotter”, lower temperature is “colder”
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Absolute vs. Relative Temperature But if Temperature is really to be defined as the  KE of the molecules, 0 degrees should be the  temperature at which ALL MOLECULES STOP  MOVING!
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