SLO 4.2 Reaction Forces

Key Concepts and Skills

Entropy: Explain what entropy is and evaluate relative difference in entropy based on varying states of matter and varying temperatures.
Gibbs Free Energy: Explain what positive, negative, or a zero value for (delta)G means for a chemical process. Apply the relationships between change in enthalpy, change in entropy, and temperature to understand the spontaneity of a chemical process.
Effect of Temperature on Spontaneity: Given values for entropy and entropy determine if temperature can alter spontaneity and calculate the temperature at which spontaneity can change if applicable for a chemical process.
Entropy of Atom Combination: Write an equation for atom combination and explain relative changes in entropy associated with the process.

From the textbook:
- 19.2 Spontaneous and Nonspontaneous Processes
- 19.3 Entropy and the Second Law of Thermodynamics
- 9.4 Entropy Changes Associated with State Changes
- 19.6 Gibbs Free Energy
- 19.8 Free Energy Changes in Chemical Reactions: Calculating \(\Delta G^o_{rxn}\)
POGIL Activities
- CA-51: What Determines if Reactions Occur?
- CA-52: How is a Change in Entropy Calculated?
- CA-L: Which Processes are Spontaneous?
Other:

Sample assessment questions for CHEM 1340 SLO 5.1

Khan Academy - Entropy
Khan Academy - Free Energy, Spontaneity
Crash Course Chemistry - Entropy/Free Energy
- Note that we do NOT use the formulas used in this video (because we use the “atom combination” method). The gist is the same, however,

From the textbook:
- Chapter 19: 8, 12, 13, 16, 27-28, 35-36, 41, 43, 47, 48, 51-53
From other external sources:
- N/A
From Dr. Thompson (links and embedded versions below):
- N/A