1. Module 7

1.16. Lesson 4

Lesson 4

Module 7—Principles of Chemical Equilibrium

Lesson 4—Quantitative Perspectives of Equilibrium

 

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A photograph shows two female students in a chemistry lab examining tubes containing solutions in a variety of colours.

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In your study of chemical equilibrium so far, you have observed colour changes. In chemical systems in which a coloured substance is involved, colour changes indicate a change in the molar concentration of the coloured substance within the system. Depending on the concentration of one coloured substance relative to other substances, the overall system’s colour describes the position of a system’s equilibrium. If the overall colour changes, it indicates that the equilibrium is changing.

 

Using colour is not always the best way to describe the position of an equilibrium. In Lesson 3 you determined the position of a chemical equilibrium system using percent reaction. To complete a calculation of percent yield, you require information about the chemical quantities of one reactant and one of the products in the system. If a chemical system involves many components, how can their chemical quantities be determined? What information about the system do these quantities provide?

 

Determining the quantities of all the reactants and products in a system is an important process in understanding a chemical equilibrium. In Lesson 4 you will learn a systematic procedure to better understand chemical equilibrium from a quantitative perspective.

 

Consider the following question as you complete Lesson 4:

  • What procedures are used to calculate the chemical quantities for all substances in a chemical system?
Module 7: Lesson 4 Assignment

 

There is no assignment for this lesson. You will be assessed on the material you learn in this lesson as part of the Lesson 5 Assignment.

 

You must decide what to do with the questions that are not marked by the teacher.

 

Remember that these questions provide you with the practice and feedback that you need to successfully complete this course. You should respond to all the questions and place those answers in your course folder.