Chapter 15 chemical equilibrium the concept of equilibrium. In this chapter learners will explore the concept of chemical equilibrium in detail. Chemical equilibrium read chemistry ck12 foundation. Many chemical reactions do not go to completion but instead attain a state of chemical equilibrium. Researchers have offered various frameworks for understanding chemistry. In this series we explain what we mean by chemical equilibrium and the. Siyavulas open physical sciences grade 12 textbook, chapter 8 on chemical equilibrium. Summary notes chemical equilibrium is a state in a reversible reaction when the rate of the forward reaction equals the rate of the reverse reaction. In this live gr 12 physical sciences show we take a look at chemical equilibrium calculations. Join helen and john as they talk about how to teach chemical equilibrium in grade 12. Exam questions 150 1 all of the following reactions are at equilibrium. Cover the book with protective material, such as plastic, old newspapers or magazines. In this lesson we discuss dynamic equilibrium as well as discuss equilibrium. How le chateliers principle predicts changes in concentration when stressing reactions at equilibrium.
Csir ugc nta net chemical science gate chemistry cy ionic equilibria chemical equilibrium notes in pdf format after. Chemical equilibrium calculations 12 may 2015 section a. Defines chemical equilibrium and lists the conditions under which chemical equilibrium will exist. Both matter and heat thermal energy can enter and leave the system. Strategies used by grade 12 physical sciences students in solving chemical equilibrium problems article pdf available june 2018 with 862 reads how we measure reads. Le chateliers principle chemical equilibrium siyavula. Siyavulas open physical sciences grade 12 textbook, chapter 8 on chemical equilibrium covering chapter summary. A state in which the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products remain constant. The reaction which does not undergo an equilibrium shift when only the volume is changed. This is very important, particularly in industrial applications, where yields must be accurately predicted and maximised.
A reaction is reversible when reactants can react to form products, and products can react to form the reactants again a reaction is in chemical equilibrium when the rate of the forward reaction equals the rate of the reverse reaction in an open system energy and matter can enter and leave the system. Chemical equilibrium at the fet band focuses mainly on grade 12 content as outlined in the national. Law of mass action the value of the equilibrium constant expression, kc, is constant for a given reaction at equilibrium and at a constant temperature. That is, there will be lots of n2o4 molecules to collide with each other. Take good care of this textbook this textbook is the property of your school.
Explain what is meant by chemical equilibrium and how it relates to reaction rates. Chemistry 12 unit 2 notes equilibrium unit 2 notes equilibrium page 3 now what were going to do is look at how the rate of the forward reaction changes if we put some pure n2o4 in a flask. Before starting this chapter it is essential that the learners have a thorough understanding of rates of reactions and chemical kinetics as covered in chapter 7. In this live gr 12 physical sciences show we take a close look at chemical equilibrium calculations. Write the equilibriumconstant expression for a heterogeneous reaction. We use this information to present the correct curriculum and to personalise content to better meet the needs of our users. Solving for an equilibrium concentration given k and. Class 11 chemistry revision notes for chapter 7 equilibrium. Le chateliers principle helps to predict what effect a change in temperature, concentration or pressure will have on the position of the equilibrium in a chemical reaction. Chemical equilibrium is based on thermodynamics and answers the question. Pdf strategies used by grade 12 physical sciences students in. Our expert teachers will work through all the important topics and give you the great study tips you need.
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