Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Monthly Update sign up
Mailing List signup
Follow The Annenberg Learner on LinkedIn Follow The Annenberg Learner on Facebook Follow Annenberg Learner on Twitter
Reactions in Chemistry
HomeSupport MaterialsActivities
Sub Image2:Macro to Micro Structures
1) Atoms and Molecules2) Macro to Micro Structures 3) Energetics and Dynamics 4) Theory and Practice in Chemical Systems
5) Chemical Design6) The Chemistry of Life7) Chemistry and the Environment8) Chemistry at the Interface

Unit 4.5 History: The Discovery of Chemical Equilibrium
The law of mass action, which led to the concept of chemical equilibrium , was discovered on the shores of Lake Natron in Egypt by Claude Berthollet.
Video program cues: 34:15 — 36:30

Crystallizing sodium carbonate


Chemical equilibrium

"Because it was on a large scale, the reaction was the reverse of the reaction. Then he, Berthollet, began to wonder: if that is the reverse of the reaction, maybe other reactions are reversed?, And he went on to 10-15 years of study and found out that many reactions were reversed."

Dr. Hugh Salzberg
Chemistry Historian

Baird, J. K. (1999)' A Generalized Statement of the Law of Mass Action, 'Journal of Chemical Education, Vol. 76, No. 8, pp: 1146-1150.

Proceed to Unit 4.6 arrow

© Annenberg Foundation 2015. All rights reserved. Legal Policy