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**Chapter 5 Thermochemistry**

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

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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

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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

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If a piece of metal at 85°C is added to water at 25°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.

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If a piece of metal at 85°C is added to water at 25°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.

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**Which reaction represents the DHf reaction for NaNO3?**

+ ( aq ) + NO 3 - ) NaNO g ) + NO s ) NO (s) 2 Na ) + N 2 ) + 3 O 2 NaNO ) + 1/2 N ) + 3/2 O

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**Which reaction represents the DHf reaction for NaNO3?**

+ ( aq ) + NO 3 - ) NaNO g ) + NO s ) NO (s) 2 Na ) + N 2 ) + 3 O 2 NaNO ) + 1/2 N ) + 3/2 O

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**Which of the following statements is true for the diagram?**

System heat work Surroundings Internal energy > 0 Internal energy < 0 Enthalpy > 0 Enthalpy < 0 Internal energy = enthalpy

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**Which of the following statements is true for the diagram?**

System heat work Surroundings Internal energy > 0 Internal energy < 0 Enthalpy > 0 Enthalpy < 0 Internal energy = enthalpy

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**What is the value of the unknown DH in the diagram?**

H2O (l) H2 (g) + 1/2 O2 (g) H2O (g) DH = –285.8 kJ DH = –44.0 kJ DH = ? kJ –329.5 kJ kJ –241.8 kJ kJ

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**What is the value of the unknown DH in the diagram?**

H2O (l) H2 (g) + 1/2 O2 (g) H2O (g) DH = –285.8 kJ DH = –44.0 kJ DH = ? kJ –329.5 kJ kJ –241.8 kJ kJ

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