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2010-06-10 17:42:42

Chapter 12 notes
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  1. How do we measure the energy content of substances?
    • in calories
    • A calorie is the quantity of heat needed to raise the temperature of 1 gram of pure water 1oc.
    • Dietary calorie=energy in food.
    • Usually measured in kilocalories=1C=1000 calories.
  2. Thermal Energy
    will always flow from a warm object to a cool object until both objects are the same temperature.
  3. Symbol Q?
    represents thermal energy or heat.
  4. Heat
    is a from of energy
  5. 1st Law of Thermodynamics
    =conservation of energy. states that in any chemical rxn or physical process, energy can be converted from one from to another, but it is neither created nor destroyed.
  6. potential energy is stored in a substance because?
    of its composition, type of atoms in the substance, number and type of bonds joining the atoms, and the way that the atoms are arranged.
  7. Kinetic Energy
    Is directly related to the constant motion of its atoms or particles and is proportional to the substance's temperature.
  8. Energy
    is the ability to do work or produce motion
  9. What is thermochemistry?
    the study of changes in heat that accompany chemical reations and phase changes.
  10. Universe
    is the system and the surroundings
  11. Surroundings
    Are everything in the universe other than the system.
  12. What is a system?
    A system is the specific part of the universe that contains the reaction or process you wish to study.