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Chapter 5 Thermochemistry

Chapter 5 Thermochemistry. Chemistry, The Central Science , 11th edition Theodore L. Brown; H. Eugene LeMay, Jr.; Bruce E. Bursten and Catherine J. Murphy. Donna Narsavage Heald Siena College Loudonville, NY  2009, Prentice-Hall.

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Chapter 5 Thermochemistry

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  1. Chapter 5Thermochemistry Chemistry, The Central Science, 11th edition Theodore L. Brown; H. Eugene LeMay, Jr.; Bruce E. Bursten and Catherine J. Murphy Donna Narsavage Heald Siena College Loudonville, NY  2009, Prentice-Hall

  2. Which metal will undergo the greatest temperature change if an equal amount of heat is added to each? • Fe, s = 0.45 J/g K • Al, s = 0.90 J/g K • Cu, s = 0.38 J/g K • Pb, s = 0.13 J/g K • Sn, s = 0.22 J/g K

  3. Which metal will undergo the greatest temperature change if an equal amount of heat is added to each? • Fe, s = 0.45 J/g K • Al, s = 0.90 J/g K • Cu, s = 0.38 J/g K • Pb, s = 0.13 J/g K • Sn, s = 0.22 J/g K

  4. If a piece of metal at 85°C is added to water at25°C, the final temperature of the system is 30°C. Which of the following is true? • Heat lost by the metal > heat gained by water. • Heat gained by water > heat lost by the metal. • Heat lost by metal > heat lost by the water. • Heat lost by the metal = heat gained by water. • More information is required.

  5. If a piece of metal at 85°C is added to water at25°C, the final temperature of the system is 30°C. Which of the following is true? • Heat lost by the metal > heat gained by water. • Heat gained by water > heat lost by the metal. • Heat lost by metal > heat lost by the water. • Heat lost by the metal = heat gained by water. • More information is required.

  6. Na ( ) + NO ( ) NaNO ( ) aq aq aq + - 3 3 Na ( ) + NO ( ) NaNO ( ) g g s + - 3 3 Na ( ) + NO ( ) NaNO (s) s s 3 3 2 Na ( ) + N ( ) + 3 O ( ) 2 NaNO ( ) s g g s 2 2 3 2 Na ( ) + 1/2 N ( ) + 3/2 O ( ) NaNO ( ) s g g s 2 2 3 Which reaction represents the DHf reaction for NaNO3?

  7. Na ( ) + NO ( ) NaNO ( ) aq aq aq + - 3 3 Na ( ) + NO ( ) NaNO ( ) g g s + - 3 3 Na ( ) + NO ( ) NaNO (s) s s 3 3 2 Na ( ) + N ( ) + 3 O ( ) 2 NaNO ( ) s g g s 2 2 3 2 Na ( ) + 1/2 N ( ) + 3/2 O ( ) NaNO ( ) s g g s 2 2 3 Which reaction represents the DHf reaction for NaNO3?

  8. System Surroundings heat work Which of the following statements is true for the diagram? • Internal energy > 0 • Internal energy < 0 • Enthalpy > 0 • Enthalpy < 0 • Internal energy = enthalpy

  9. System Surroundings heat work Which of the following statements is true for the diagram? • Internal energy > 0 • Internal energy < 0 • Enthalpy > 0 • Enthalpy < 0 • Internal energy = enthalpy

  10. H2 (g) + 1/2O2 (g) DH= ? DH= –285.8 kJ H2O (g) DH= –44.0 kJ H2O (l) What is the value of the unknown DH in the diagram? • +329.5 kJ • –329.5 kJ • +285.8 kJ • –241.8 kJ • +241.8 kJ

  11. H2 (g) + 1/2O2 (g) DH= ? DH= –285.8 kJ H2O (g) DH= –44.0 kJ H2O (l) What is the value of the unknown DH in the diagram? • +329.5 kJ • –329.5 kJ • +285.8 kJ • –241.8 kJ • +241.8 kJ

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