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Units

Units. Calculations. Energy. Vocab. Temperature. Grab Bag. Units. Calculations. Energy. Vocab. Temperature. Grab Bag. $100. $100. $100. $100. $100. $100. $200. $200. $200. $200. $200. $200. $300. $300. $300. $300. $300. $300. $400. $400. $400. $400. $400. $400.

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Units

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  1. Units

  2. Calculations

  3. Energy

  4. Vocab

  5. Temperature

  6. Grab Bag

  7. Units Calculations Energy Vocab Temperature Grab Bag $100 $100 $100 $100 $100 $100 $200 $200 $200 $200 $200 $200 $300 $300 $300 $300 $300 $300 $400 $400 $400 $400 $400 $400 $500 $500 $500 $500 $500 $500

  8. What is the SI unit for temperature?

  9. Kelvin

  10. What is the unitfor molar heat capacity?

  11. J/K∙mol

  12. What is the unit for n?

  13. mol

  14. What is the unitof energy? Write the word and symbol on the board.

  15. Joules, J

  16. What is the unit for molar enthalpy?

  17. J/mol

  18. What is the genericequation for changing Celsius into Kelvin.

  19. °C + 273= K

  20. Use this equation if you are finding the change in heat for 25g of water.

  21. q =nC∆T

  22. Use this equation if you are finding the molar enthalpy change and do not have the amount in moles.

  23. ∆ H=C∆T

  24. What is the generic equation for finding the change in enthalpy for a reaction using Enthalpies of Formation?

  25. ∆H= ∆H°f products- ∆H°f reactants

  26. Calculate the change in enthalpy when forming aluminum oxide. 2Al(s) + 3H2O(l)→ Al2O3(s) + 3H2(g)∆Hf H2O= -285.8 kJ/mol ∆Hf Al2O3= -1676.0 kJ/mol

  27. -1676.0-(3x-285.8)=-818.6kJ/mol

  28. If the energy change in a reaction is negative the reaction is __________.

  29. Exothermic

  30. When ∆H is positive, the reaction is __________.

  31. Endothermic

  32. What is the only way we measure energy?

  33. With a thermometer

  34. Calculate the molar enthalpy change of N2(g) when it is heated from 90.0°C to 100.°C. The molar heat capacity of nitrogen is 29.1 J/K∙mol. Don’t forget to round to the correct sig figs.

  35. 291 J/mol

  36. Calculate ∆H for this reaction:3Fe2O3(s) → 6Fe(s) + 4.5O2(s)3Fe2O3(s)→2Fe3O4(s) + 1/2O2(s) ∆H=-316kJ/mol3Fe(s) + 2O2(g) → Fe3O4(s) ∆H=-201kJ/mol.

  37. 86kJ/mol

  38. Definemolar heat capacity. Hint: think about the units

  39. The amount of energy required to raise 1 mole of a substance 1K.

  40. Defineextensive property.

  41. A property that depends on the amount of substance, like heat.

  42. Define intensive property. Is heat or temperature intensive?

  43. A property that is independent of the amount of substance, like temperature.

  44. Define heat.

  45. The energy transferred between two objects of different temperatures.

  46. Define Hess’s Law.

  47. The change in enthalpy for a reaction is equal to the sum of the individual enthalpy changes.

  48. Definetemperature.

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