Unit 3
Course Guide
CHM 112

 
  
Chemical Kinetics and
Chemical Equilibrium
 
Goal I
Goal II
Goal III
Goal V
Unit 3 Assignments
Overview
Unit 0
Unit 1
Unit 2
Unit 3
Unit 4
Unit 6

Goal I. Formulate and understand rate laws.

Objectives: To meet the requirements of Goal I, you must be able to:

  1. describe the rate of a chemical reaction in terms of concentration and time.
  2. understand average rate, instantaneous rate, and initial rate of a reaction.
  3. understand rate constant, order of the reaction with respect to each reactant, half life of a first order reaction and a second order reaction. Understand and use integrated rate laws for first order and second order reactions (sample and follow-up problems 16.4, 16.5).
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Goal II. Understand factors that affect reaction rates.

Objectives: To meet the requirements of Goal II, you must be able to:

  1. study the relation between the rate constant and the identity of reactants.
  2. understand the effect of a solvent on the reaction and the difference between reactions in solution and heterogeneous reactions.
  3. study the Arrhenius Equation and understand the significance of activation energy. Work out problems using the Arrhenius Equation to solve for the new rate constant given the original rate constant, original temperature, and the new temperature (sample and follow-up problem 16.6).
  4. understand how catalysts work; homogeneous, heterogeneous and enzymes.
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Goal III. Understand theories of reaction rates and reaction mechanics.

Objectives: To meet the requirements of Goal III, you must be able to:

  1. understand the Collision Theory.
  2. understand the Activated Complex Theory.
  3. predict the rate-determining step and the intermediates, given the reaction mechanism. 

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Goal IV. Formulate and interpret the equilibrium equation for a reversible chemical reaction. 

Objectives: To meet the requirements of Goal IV, you must be able to:

  1. describe the condition known as chemical equilibrium by:
    • defining “forward” and “reverse” reactions in an equilibrium system;
    • describing the relative rates with which the forward and reverse reactions occur in a system at equilibrium.
  2. distinguish between homogeneous and heterogeneous equilibria, and write the equilibrium constant expression from a balanced chemical equation for either type of equilibria.
  3. relate the magnitude of the equilibrium constant for a given reaction:
    • to the relative amounts of “reactants” and “products” present at equilibrium;
    • to the speed with which equilibrium is reached, and explain what is meant saying a reaction “goes to completion.”
  4. predict the direction of reaction from the reaction quotient, Qc, and the numerical value of Kc, given concentrations of all chemical species involved in a reaction system which is not at equilibrium (sample and follow-up problem 17.5).
  5. relate the numerical value of equilibrium constant to how the chemical equation is written and balanced. Understand the relationship between Kc forward, Kc reverse, and the two Kcs for two chemical equations that are related by a numeric factor (sample and follow-up problem 17.3).
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Goal V. Use Le Châtelier's principle to predict shifts in chemical equilibria.

Objectives: To meet the requirements of Goal V, you must be able to:

  1. describe the effect on the numerical value of the equilibrium constant Kc for a system at equilibrium of:
    • increasing or decreasing concentration of a reactant or product;
    • increasing or decreasing the pressure on the system;
    • changing the temperature of the system;
    • adding a catalyst to the system.
  1. describe qualitatively the effects on the amount of any specified component of a system at equilibrium of changing the conditions of the system by:
    • changing the equilibrium concentration of a specified component;
    • changing the pressure on the equilibrium system;
    • changing the temperature of the system;
    • adding a catalyst to the system.
  2. understand the relationship between Kc and Kp, convert from one to the other (sample and follow-up problems 17.4). Calculate the Kc given the equilibrium concentration data (sample and follow-up problems 17.6). Calculate equilibrium concentrations given Kc (sample and follow-up problems 17.7 and 17.8). Learn to construct a reaction table (p. 737)
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Unit 3 Assignments
Objectives 1 through 10
Read Text:
Video Programs:
Chapter 16: pp. 673-712
9. Kinetics
Objectives 11 through 18
Text:
Video Programs:
Chapter 17: pp. 722-756
10. Chemical equilibrium
11. Le Chalelier's principle
Textbook Assignments: Read and Understand all "Sample Problems," "Follow Up Problems" and select any 5 blue-colored problems at the end of the chapters.

The answers to the Follow Up Problems are at the end of each chapter; the answers to the blue-colored problems are in Appendix E.

Mandatory ChemSkill Builder Assignments to be submitted for grade (Scores of 80% or higher on each section will receive full credit): Chapter 16.1, 16.2, 16.3, 16.4, 16.5, 16.6 Chemical Kinetics; 
Chapter 17.1, 17.2, 17.3, 17.4, 17.5 Chemical Equilibrium;
Take Exam: Exam 3
Note: Complete Solutions, including all units of measurement, must be done for all problems.

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Overview
Unit 0
Unit 1
Unit 2
Unit 3
Unit 4
Unit 6