2. Created by Lynne Crandall University of Michigan Revised by Mark Kondrak CLA Language Center University of Minnesota Could you put an image here?

3. 500 400 300 200 100 ThermochemistryConceptsDefinitions Free energy, Enthalpy and Entropy Calculations Bring the heat

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

5. Categories Calculations 100 Points 0.46 J/(g o C)

6. Categories Calculations 200 Points If a reaction has a ∆H rxn of -700 kJ and a ∆S of +39.0 J/K, What is ∆G rxn at 325 K?

7. Categories -80 kJ Calculations 200 Points

8. Categories Calculations 300 Points What is ∆H for the following reaction? 2CO (g) + 2NO (g)  2CO 2 (g) +N 2 (g) a.2CO (g) + O 2 (g)  2CO 2 (g) ∆H= -566.0 kJ b. N 2 (g) + O 2 (g)  2NO (g) ∆H = 180.6 kJ

9. Categories Calculations 300 Points -746.6 kJ

10. Categories Use the standard enthalpies of formation to calculate ∆H rxn, for the combustion of methane. ∆H o f (CO 2) = -394 kJ ∆H o f (H 2 O) = -286 kJ ∆H o f (CH 4 ) = -75 kJ Calculations 400 Points

11. Categories ∆H o rxn = -891 kJ Calculations 400 Points

12. Categories Consider the reaction below at 25 o C for which ∆S= 16.1 J/K and ∆H=163.8 kJ. CH 4 (g) + N 2 (g)  HCN (g) + NH 3 (g) At what temperature will this reaction be spontaneous? Calculations 500 Points

13. Categories Above 10174 K Calculations 500 Points

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

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

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

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

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

19. Categories ∆H rxn Bring the Heat 300 Points

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

21. Categories Bring the Heat 400 Points What is a calorie?

22. Categories ∆H fusion is a(n) ______________ reaction. Bring the Heat 500 Points

23. Categories Endothermic Bring the Heat 500 Points

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

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

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

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

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

29. Categories Free Energy, Enthalpy and Entropy 300 Points Negative

30. Categories Arrange the following in order of INCREASING entropy: S liquid, S gas, S solid Free Energy, Enthalpy and Entropy 400 Points

31. Categories S solid < S liquid < S gas Free Energy, Enthalpy and Entropy 400 Points

32. Categories When a reaction is endothermic and has decreasing entropy it is: a.Always spontaneous b.Never spontaneous c.Sometimes spontaneous Free Energy, Enthalpy and Entropy 500 Points

33. Categories Never spontaneous Free Energy, Enthalpy and Entropy 500 Points

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

35. Categories Definitions 100 Points What is energy?

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

37. Categories What is heat? Definitions 200 Points

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

39. Categories Definitions 300 Points What is entropy?

40. Categories 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. Definitions 400 Points

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

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

43. Categories What is the system? Definitions 500 Points

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

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

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

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

48. Categories Thermochemistry Concepts 300 Points What is the equation for ΔH o rxn ?

49. Categories Thermochemistry Concepts 300 Points ΔH o rxn = ΣnΔH o f (products) - ΣnΔH o f (reactants)

50. Categories Thermochemistry Concepts 400 Points What is specific heat?

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

52. Categories On the scale of standard enthalpies of formation, how are the elements in their standard states defined? Thermochemistry Concepts 500 Points

53. Categories Elements in their standard states are assigned enthalpies of formation of 0.0 kJ. Thermochemistry Concepts 500 Points

54. Categories

55. The Daily Double