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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. Download Presentation ## 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. Joules, J

15. What is the unit for molar enthalpy?

16. J/mol

17. °C + 273= K

18. q =nC∆T

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

20. ∆ H=C∆T

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

22. ∆H= ∆H°f products- ∆H°f reactants

23. 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

24. -1676.0-(3x-285.8)=-818.6kJ/mol

25. Exothermic

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

27. Endothermic

28. What is the only way we measure energy?

29. With a thermometer

30. 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.

31. 291 J/mol

32. 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.

33. 86kJ/mol

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

35. Defineextensive property.

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

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

38. Define heat.

39. Define Hess’s Law.

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

41. Definetemperature.

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