Internal Energy Worksheet - Answer Key

 

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  1. What is internal energy?

    It is the energy on the molecular level. 

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  2. What equation relates internal energy, E, to heat and work?

    ΔE = q +w                            

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  3. When utilizing the above equation, 2 things must be kept in mind.

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    1. The numerical values of q and w

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    2. The signs of q and w.  The signs are based on whether the system loses or gains heat/work energy.

     

     

  4. One mol of H2O (g)@ 1.00 atm and 100. °C has a volume of 30.6L. When one mol of H2O(g) is condensed to one mol H2O(l) @ 1.00 atm and 100.°C, 40.66kJ of heat is released.  Calculate ΔE for the condensation of 1.00 mol H2O @ 1.00atm and 100.°C.

    ΔE = –37.6 kJ

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