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  • Home
  • About
  • Classes
    • Biology
    • Chemistry
    • Physics
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    • Pre-calculus & Calculus
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Unit 15: Chemical Equilibrium:  How far does a reaction go? 

Reading
BJU Chemistry: Ch. 15 "Chemical Equilibrium" 
Zumdahl Chemistry: Ch. 13 "Chemical Equilibrium" 

Topics
  • Dynamic equilibrium
  • Equilibrium constant 'K'
  • LeChatelier's Principle
  • Solubility

​Labs
  • Nitrocellulose lab
  • "Reactions and Rates" PhET weblab
  • "Reversible Reactions" PhET weblab
Video shows a good example of "chemical equilibrium"
15._chemical_equilibrium_lecture_notes__2020_.docx
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Lecture outline
  • Equilibrium concepts, reversible reactions, equilibrium graphs
  • The equilibrium equation with equilibrium constant, 'K'
  • How to treat solids and solvents in the equilibrium equation
  • Le Chatelier's Principle.
  • How equilibrium is effected by temperature, pressure, concentration, catalysts
  • Industrial applications: ionization-dissociation, solubility, precipitation reactions

What is meant by "chemical equilibrium"?
  1. Thermodynamics answers the question, "Will a reaction occur?" (Units 12 & 13)
  2. Kinetics answers the question, "How fast will a reaction go?" (Unit 14)
  3. Chemical equilibrium answers the question, "How far will a reaction proceed before it stops?" This is an extremely important topic in biochemistry and industrial chemistry.
(optional) Polymers lab, part 1
  • We will start with the nitrocellulose we made last time, and turn it into a plastic (a polymer)! 
  • Historically, nitrocellulose was the first plastic! It was used to make billiard balls, hair combs, Kodak film, and as a coating for early airplane wings! 
  • It has a very interesting history (which we will discuss briefly). 

Chemical Equilibrium homework questions
This assignment is now hosted in Canvas in multiple-choice format. Please respond to the questions there, and use the video below for help. 
AP Chem:  Chemical Equilibrium questions
AP students only 
_ap_chem_-_chemical_equilibrium_questions.docx
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