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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.

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Presentation on theme: "Chapter 5 Thermochemistry Chemistry, The Central Science, 11th edition Theodore L. Brown; H. Eugene LeMay, Jr.; Bruce E. Bursten and Catherine J. Murphy."— Presentation transcript:

1 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

2 Which metal will undergo the greatest temperature change if an equal amount of heat is added to each? 1.Fe, s = 0.45 J/g K 2.Al, s = 0.90 J/g K 3.Cu, s = 0.38 J/g K 4.Pb, s = 0.13 J/g K 5.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? 1.Fe, s = 0.45 J/g K 2.Al, s = 0.90 J/g K 3.Cu, s = 0.38 J/g K 4.Pb, s = 0.13 J/g K 5.Sn, s = 0.22 J/g K

4 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? 1.Heat lost by the metal > heat gained by water. 2.Heat gained by water > heat lost by the metal. 3.Heat lost by metal > heat lost by the water. 4.Heat lost by the metal = heat gained by water. 5.More information is required.

5 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? 1.Heat lost by the metal > heat gained by water. 2.Heat gained by water > heat lost by the metal. 3.Heat lost by metal > heat lost by the water. 4.Heat lost by the metal = heat gained by water. 5.More information is required.

6 Which reaction represents the H f reaction for NaNO 3 ?

7 1. Na + ( aq ) + NO 3 - ( aq ) NaNO 3 ( aq ) 2. Na + ( g ) + NO 3 - ( g ) NaNO 3 ( s ) 3. Na ( s ) + NO 3 ( s ) NaNO 3 (s) 4. 2 Na ( s ) + N 2 ( g ) + 3 O 2 ( g ) 2 NaNO 3 ( s ) 5. 2 Na ( s ) + 1/2 N 2 ( g ) + 3/2 O 2 ( g )NaNO 3 ( s )

8 Which of the following statements is true for the diagram? 1.Internal energy > 0 2.Internal energy < 0 3.Enthalpy > 0 4.Enthalpy < 0 5.Internal energy = enthalpy System heat work Surroundings

9 Which of the following statements is true for the diagram? 1.Internal energy > 0 2.Internal energy < 0 3.Enthalpy > 0 4.Enthalpy < 0 5.Internal energy = enthalpy System heat work Surroundings

10 What is the value of the unknown H in the diagram? kJ 2.–329.5 kJ kJ 4.–241.8 kJ kJ H 2 O (l) H 2 (g) + 1/2 O 2 (g) H 2 O (g) H = –285.8 kJ H = –44.0 kJ H = ?

11 What is the value of the unknown H in the diagram? kJ 2.–329.5 kJ kJ 4.–241.8 kJ kJ H 2 O (l) H 2 (g) + 1/2 O 2 (g) H 2 O (g) H = –285.8 kJ H = –44.0 kJ H = ?


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