•

**Approximately 250 new end-of-chapter problems have been added, most of these in the cumulative and challenge categories.**
As a result, the book now has about 20% more cumulative problems and about 50% more challenge problems.

•

**A new design increases readability, clarity, and visual appeal.**
Readers will find the text itself easier to read, and will also find the two and three column in-text examples easier to navigate and work through. The result is a cleaner, crisper presentation of the material.

**• In chapter 18 (Electrochemistry), the presentation of the calculation of cell potentials has been changed**
from

*E*
°

_{cell}
=

*E*
°

_{oxidation}
+

*E*
°

_{reduction}
to

*E*
°

_{cell}
=

*E*
°

_{cathode}
—

*E*
°

_{anode}
, where

*E*
°

_{oxidation}
is

*E*
°

_{cathode}
and

*E*
°

_{reduction}
is simply —

*E*
°

_{anode}
.

–Although the two methods are numerically and mathematically equivalent, user feedback shows that the second method is conceptually superior because the driving force of an electrochemical cell really is a difference, not a sum.

–Both ways give the same answer, but the difference method is a more conceptually accurate way to think of the problem.

•

**A new section on thermal energy transfer has been added to chapter 6 (Thermochemistry). **
The addition of this material (in section 6.4), as well as the corresponding new example and conceptual connection, gives students a better foundation for understanding calorimetry.

•

**The coverage of Coulomb’s law has been moved from chapter 9 (Chemical Bonding I: Lewis Theory) to chapter 8 (Periodic Properties of the Elements). **
The earlier introduction of Coulomb’s law, in section 8.3, allows a better explanation of key concepts in chapter 8, including penetration, shielding, sub-level energy splitting in multielectron atoms, and effective nuclear charge.

•

**Chapter 12 (solutions) has been reorganized so that all the colligative properties are now covered in one section (12.6) entitled Colligative Properties: Vapor Pressure Lowering, Freezing Point Depression, Boiling Point Elevation, and Osmotic Pressure.**
A separate section (12.7) covers the colligative properties of strong electrolyte solutions. The new organization groups conceptually similar concepts together and makes the chapter progress more logically.

•

**A new section has been added to chapter 17 (Free Energy and Thermodynamics) in order to better describe the concepts of microstates and macrostates. **
This addition to section 17.3 helps lay the foundation for a better understanding of the concept of entropy.

•

**The Solutions Manual has been thoroughly accuracy checked and completely redesigned**
to improve student ease of use.

•

**Within MasteringChemistry**
^{®}
**, the number of randomizable end-of-chapter problems has been greatly increased, **
and problems now feature both numerical and chemical randomization.