CH 221--Ziegler
Chapter 5
KEY CONCEPTS
Class period 1 -- Reading pp. 153-155(b); 155b-156m; 156m-158 (m); 158m- 164.
1. Relate the following: relative enthalpies of reactants and products, sign of ∆H, heat flow
between system and surroundings. Problem 5.30
Note: There is much in the chapter which we not emphasize, particularly P-V work.
This is why I want you to skim the parts indicated above. They give useful
background material, but you will not be examined on them.
Class period 2 -- Reading pp. 166 – 171.
2. Use a thermochemical equation to relate ∆H to mass of reactant or product and/or to
∆H of the reverse reaction. Problems 5.33, 5.34
3. Relate heat flow to specific heat, mass, and temperature change. Problems 5.44, 5.46,
5.47
4. Calculate q for a reaction from calorimeter data. Problems 5.49, 5.50
Class period 3 -- Reading pp. 174-180; 300(m) to 303(b).
5. Use Hess’ law to calculate ∆H. Problems 5.58, 5.60
6. Relate ∆H to enthalpies of formation. Problems 5.63, 5.68, 5.72 a)
7. Define the term “bond energy,” and relate bond energy to bond strength. Problems 8.61
a) and b)
Skim the pages marked with highlighter, for meaning, but don’t worry about being tested on these
topics.
