Ch. 17 - Chemical ThermodynamicsSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: What would be the signs of ∆H and ∆S for the reaction AB4(g) → AB3(g) + B(g) ? 1. Both zero. 2. ∆H = +, ∆S = − 3. Impossible to tell from the information given. 4. Both positive.  5. ∆H = −, ∆S = 0 6. ∆H = 0, ∆S = − 7. ∆H = −, ∆S = + 8. Both negative. 9. ∆H = +, ∆S = 0 10. ∆H = 0, ∆S = +

Problem

What would be the signs of ∆H and ∆S for the reaction

AB4(g) → AB3(g) + B(g) ?

1. Both zero.

2. ∆H = +, ∆S = −

3. Impossible to tell from the information given.

4. Both positive. 

5. ∆H = −, ∆S = 0

6. ∆H = 0, ∆S = −

7. ∆H = −, ∆S = +

8. Both negative.

9. ∆H = +, ∆S = 0

10. ∆H = 0, ∆S = +