1. 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

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 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.

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?
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. 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

7. 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

8. 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

9. 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

10. 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

11. 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