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Energy, Heat, and Work

  • Temperature and Heat are NOT the same thing.
  • Thermodynamic quantities always have two parts: a numerical value and a sign. The sign indicates the direction of flow. We always take the System’s point of view.
  • Heat is the thing that “flows” due to a temperature difference: heat flows from a hotter object to colder object.
  • There are two ways to transfer energy: Heat and Work.
  • The change in energy of a system is the sum of the Heat transferred to/from the system + the Work done to/by the system. In equation form,
    ΔE = q + w

Energy, Heat, and Work

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Advanced Placement Chemistry