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Could you put an image here?. Created by Lynne Crandall University of Michigan Revised by Mark Kondrak CLA Language Center University of Minnesota. Calculations. Free energy, Enthalpy and Entropy. Definitions. Thermochemistry Concepts. Bring the heat. 100. 100. 100. 100. 100. 200.

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  1. Could you put an image here? Created by Lynne CrandallUniversity of MichiganRevised by Mark KondrakCLA Language CenterUniversity of Minnesota

  2. Calculations Free energy, Enthalpy and Entropy Definitions Thermochemistry Concepts Bring the heat 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500

  3. Calculations 100 pts A 15.75 g piece of iron absorbs 1086.75 joules of energy, and its temperature changes from 25oC to 175oC. Calculate the specific heat capacity of iron.

  4. Calculations 100 Points 0.46 J/(g oC)

  5. Calculations 200 Points If a reaction has a ∆Hrxn of -700 kJ and a ∆S of +39.0 J/K, What is ∆Grxn at 325 K?

  6. Calculations 200 Points -80 kJ

  7. Calculations 300 Points • What is ∆Hfor the following reaction? • 2CO (g) + 2NO (g) 2CO2 (g) +N2 (g) • 2CO (g) + O2 (g)  2CO2 (g) ∆H= -566.0 kJ • N2 (g) + O2 (g)  2NO (g) ∆H= 180.6 kJ

  8. Calculations 300 Points -746.6 kJ

  9. Calculations 400 Points Use the standard enthalpies of formation to calculate ∆Hrxn , for the combustion of methane. ∆Hof (CO2) = -394 kJ ∆Hof (H2O) = -286 kJ ∆Hof (CH4) = -75 kJ

  10. Calculations 400 Points ∆Horxn= -891 kJ

  11. Calculations 500 Points Consider the reaction below at 25oC for which ∆S= 16.1 J/K and ∆H=163.8 kJ. CH4 (g) + N2 (g)  HCN (g) + NH3 (g) At what temperature will this reaction be spontaneous?

  12. Calculations 500 Points Above 10174 K

  13. Bring the Heat 100 Points The amount of energy absorbed by a substance to change it from a liquid to a gas

  14. Bring the Heat 100 Points What is heat of vaporization?

  15. Bring the Heat 200 Points The amount of energy absorbed by a substance to change from a solid to a liquid.

  16. Bring the Heat 200 Points What is heat of fusion?

  17. Bring the Heat 300 Points At constant pressure, q=?

  18. Bring the Heat 300 Points ∆Hrxn

  19. Bring the Heat 400 Points The amount of heat required to raise the temperature of one gram of pure water by one degree Celsius.

  20. Bring the Heat 400 Points What is a calorie?

  21. Bring the Heat 500 Points ∆Hfusion is a(n) ______________ reaction.

  22. Bring the Heat 500 Points Endothermic

  23. Free Energy, Enthalpy and Entropy 100 Points The heat content of a system at constant pressure.

  24. Free Energy, Enthalpy and Entropy 100 Points What is enthalpy (H)?

  25. Free Energy, Enthalpy and Entropy 200 Points The energy available to do work.

  26. Free Energy, Enthalpy and Entropy 200 Points What is Gibbs Free energy (G)?

  27. Free Energy, Enthalpy and Entropy 300 Points A reaction is spontaneous when Gibbs Free energy is ____________.

  28. Free Energy, Enthalpy and Entropy 300 Points Negative

  29. Free Energy, Enthalpy and Entropy 400 Points Arrange the following in order of INCREASING entropy: S liquid, Sgas, Ssolid

  30. Free Energy, Enthalpy and Entropy 400 Points Ssolid< Sliquid < Sgas

  31. Free Energy, Enthalpy and Entropy 500 Points • When a reaction is endothermic and has decreasing entropy it is: • Always spontaneous • Never spontaneous • Sometimes spontaneous

  32. Free Energy, Enthalpy and Entropy 500 Points Never spontaneous

  33. Definitions 100 Points The ability to do work or produce heat.

  34. Definitions 100 Points What is energy?

  35. Definitions 200 Points The process of energy flowing from a warmer object to a cooler object.

  36. Definitions 200 Points What is heat?

  37. Definitions 300 Points The measure of disorder or randomness in a system.

  38. Definitions 300 Points What is entropy?

  39. Definitions 400 Points The change in enthalpy that accomapnies the formation of one mole of the compound in its standard state from its constituent elements in their standard states.

  40. Definitions 400 Points What is the standard enthalpy (heat) of formation?

  41. Definitions 500 Points The part of the universe that we are interested in studying.

  42. Definitions 500 Points What is the system?

  43. Thermochemistry Concepts 100 Points What is the difference between an exothermic and endothermic reaction?

  44. Thermochemistry Concepts 100 Points An exothermic reaction releases heat while an endothermic reaction absorbs heat.

  45. Thermochemistry Concepts 200 Points Explain why a gaseous state of a substance has a greater entropy than the liquid state of the same substance.

  46. Thermochemistry Concepts 200 Points A gaseous substance has more disorder than a liquid substance because the particles are moving in a constant random motion.

  47. Thermochemistry Concepts 300 Points What is the equation for ΔHorxn?

  48. Thermochemistry Concepts 300 Points ΔHorxn= ΣnΔHof (products) - ΣnΔHof (reactants)

  49. Thermochemistry Concepts 400 Points What is specific heat?

  50. Thermochemistry Concepts 400 Points The amount of heat required to raise the temperature of one gram of that substance by one degree Celsius.

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