5.111SC | Fall 2014 | Undergraduate

Principles of Chemical Science

Unit III: Thermodynamics & Chemical Equilibrium

Lecture 18: Introduction to Chemical Equilibrium

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Image excerpted from Lecture 18 Notes 

  1. Chemical Equilibrium
    1. Nature of Chemical Equilibrium
    2. Meaning of the Chemical Equilibrium Constant K
    3. External Effects on K (Le Châtlier’s Principle)

Lecture Video

Reactions reach chemical equilibrium when the rate of the forward reaction equals the rate of the reverse reaction. In this lecture, we discuss the nature of chemical equilibrium and of the chemical equilibrium constant. We start to consider how external factors can “push” the equilibrium in one direction or the other. Physicist and Chemist Nozomi Ando provides an example of why chemical equilibrium is important in living organisms.

Lecture Notes

Notes for Lecture 18 (PDF)

Clicker Questions

Lecture 18 Clicker Questions (PDF)

Textbook Reading

Chemical Equilibrium Sections 10.1–10.5, and 10.9 Sections 9.1–9.4

Understanding Chemotherapeutic Drug Targets

Nozomi Ando conducts research on a protein that is essential for DNA synthesis, repair, and replication. She explains how this protein is in equilibrium between an active and an inactive form, and how discovering strategies to lock the protein in the inactive conformation could lead to treatments for cancer and/or could be used in the creation of new antibiotics.

Nozomi Ando’s Personal Story

Nozomi Ando, a self-described artist and comic book lover, describes how her training to become a scientist was akin to that of a ninja. Like a ninja apprenticeship, expert scientists have worked with her at every stage of her career to show her the way of the scientist.

Problems and Solutions

Problems for Lecture 18 (PDF)

Solutions for Lecture 18 (PDF)

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