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90,000 J Endo ∆H +

1. Draw a heating curve for this substance being heated from 200 °C to 1400 °C and label all formulas used to calculate heat. 2. How much heat is required to raise the temperature of 60 grams of this substance from 450 °C to 750 °C?  a) Endo or Exo ? b) ΔH: + or ―?. 90,000 J Endo

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90,000 J Endo ∆H +

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  1. 1. Draw a heating curve for this substance being heated from 200 °C to 1400 °C and label all formulas used to calculate heat.

  2. 2. How much heat is required to raise the temperature of 60 grams of this substance from 450 °C to 750 °C?  a) Endo or Exo? b) ΔH: + or ―?

  3. 90,000 J • Endo • ∆H +

  4. 3. How much heat is required to convert 500 grams of this substance from a liquid to a vapor at 1250 °C? Endo or Exo? ΔH: + or ―?

  5. 100,000 kJ • Endo • ∆H +

  6. 4. How much heat must be released when 125 grams of this substance at 325 °C is cooled to 250 °C? Endo or Exo? ΔH: + or ―?

  7. 70312.5 J • Exo • ∆H -

  8. 5. 50 grams of the substance at 600 °C absorbs 1000 J of heat. What is the final temperature of the substance?

  9. 604 °C

  10. 6. A student heats 35 g of a metal to 120 °C. He places the metal in a calorimeter containing 85 g of water at 23 °C. The final temperature in the calorimeter is 29 °C. Find the specific heat of the metal.

  11. 0.67 J/g°C

  12. 7. The specific heat capacity of aluminum is 0.90 J/g°C. A student heats an aluminum rod to 140 °C and places it in a calorimeter containing 55 g of water at 23 °C. The final temperature in the calorimeter is 31 °C. Find the mass of the aluminum.

  13. 18.7 g

  14. 8. The specific heat capacity of aluminum is 0.90 J/g°C. A student heats a 150 g aluminum rod to 225 °C and places it in a calorimeter containing water at 26 °C. The final temperature in the calorimeter is 35 °C. Find the mass of the water.

  15. 682 g

  16. 9. If 350.0 J is added to 25.0 grams of water at 15.0 °C, what would be the final temperature of the water? The specific heat capacity of water is 4.18 J/g°C.

  17. 18.35 °C

  18. 10. Predict the sign of ΔS for these changes: • O2 (g) → O2 (aq)

  19. negative

  20. C6H6 (s) → C6H6 (l)

  21. positive

  22. C(s) + CO2 (g) → 2 CO (g)

  23. positive

  24. C12H22O11 (s) → C12H22O11 (aq)

  25. positive

  26. 2 NO2 (g) → N2O4 (g)

  27. negative

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