Chapter 15 Equilibrium
|
|
- Amanda Peters
- 6 years ago
- Views:
Transcription
1 Chapter 15. Chemical Equilibrium Sample Exercise 15.1 (p. 632) Write the equilibrium expression for K eq for these three reactions: a) 2 O 3(g) 3 O 2(g) b) 2 NO (g) + Cl 2(g) 2 NOCl (g) c) Ag + (aq) + 2 NH 3(g) Ag(NH 3 ) 2 + (aq) Practice Exercise 15.1 Write the equilibrium expression for K eq for these three reactions: a) H 2(g) + I 2(g) 2 HI (g) b) Cd 2+ (aq) + 4 Br - (aq) CdBr 4 2- (aq - 1 -
2 Sample Exercise 15.2 (p. 634) In the synthesis of ammonia from nitrogen and hydrogen, N 2(g) + 3 H 2(g) 2 NH 3(g) K c = 9.60 at 300 o C. Calculate K p for this reaction at this temperature. (4.34 x 10-3 ) Practice Exercise 15.2 For the equilibrium 2 SO 3(g) 2 SO 2(g) + O 2(g), K c is 4.08 x 10-3 at 1000 K. Calculate the value for K p. (0.335) Sample Exercise 15.3 The following diagrams represent three different systems at equilibrium, all in the same size containers. a) Without doing any calculations, rank the three systems in order of increasing equilibrium constant, K c. b) If the volume of the containers is 1.0 L and each sphere represents 0.10 mol, calculate K c for each system. Practice Exercise 15.3 The equilibrium constant for the reaction H 2(g) + I 2(g) 2 HI (g) varies with temperature as follows: K p = 792 at 298 K; K p = 54 at 700 K. Is the formation of HI favored more at the higher or lower temperature? - 2 -
3 Sample Exercise 15.4 (p. 637) The equilibrium constant for the reaction of N 2 with O 2 to form NO equals K c = 1 x at 25 o C. N 2(g) + O 2(g) 2 NO (g) Using this information, write the equilibrium constant expression and calculate the equilibrium constant for the following reaction: 2 NO (g) N 2(g) + O 2(g) Practice Exercise 15.4 For the formation of NH 3 from N 2 and H 2, N 2(g) + H 2(g) 2 NH 3(g), K p = 4.34 x 10-3 at 300 o C. What is the value of K p for the reverse reaction? (2.30 x 10 2 ) Sample Exercise 15.5 (p. 638) Given the following information, HF (aq) H + (aq) + F - (aq) K c = 6.8 x 10-4 H 2 C 2 O 4(aq) 2 H + 2- (aq) + C 2 O 4 (aq) K c = 3.8 x 10-6 determine the value of K c for the following reaction: 2 HF (aq) + C 2 O 4 2- (aq) 2 F - (aq) + H 2 C 2 O 4(aq) (0.12) - 3 -
4 Practice Exercise 15.5 Given the following information at 700 K, H 2(g) + I 2(g) 2HI (g) K p = 54.0 N 2(g) + 3 H 2(g) 2 NH 3(g) K p = 1.04 x 10-4 determine the value of K p (at 700 K) (1.51 x 10 9 ) 2 NH 3(g) + 3 I 2(g) 6 HI (g) + N 2(g) Sample Exercise 15.6 (p. 640) Write the equilibrium-constant K c for each of the following reactions: a) CO 2(g) + H 2(g) CO (g) + H 2 O (l) K c = b) SnO 2(s) + 2 CO (g) Sn (s) + 2 CO 2(g) K c = Practice Exercise 15.6 Write the equilibrium-constant expressions for each of the following reactions: a) Cr (s) + 3 Ag + (aq) Cr 3+ (aq) + 3 Ag (s) K c = b) 3 Fe (s) + 4 H 2 O (g) Fe 3 O 4(s) + 4 H 2(g) K p = - 4 -
5 Sample Exercise 15.7 (p. 641) Each of the following mixtures was placed in a closed container and allowed to stand. Which of these mixtures is capable of attaining the equilibrium CaCO 3(s) CaO (s) + CO 2(g) a) pure CaCO 3 b) CaO and a pressure of CO 2 greater than the value of K p c) Some CaCO 3 and a pressure of CO 2 greater than the value of K p d) CaCO 3 and CaO Practice Exercise 15.7 When added to Fe 3 O 4(s) in a closed container, which one of the following substances H 2(g), H 2 O (g), O 2(g) - will allow equilibrium to be established in the reaction 3 Fe (s) + 4 H 2 O (g) Fe 3 O 4(s) + 4 H 2(g) Sample Exercise 15.8 (p. 642) A mixture of hydrogen and nitrogen in a reaction vessel is allowed to attain equilibrium at 472 o C. The equilibrium mixture of gases was analyzed and found to contain 7.38 atm H 2, 2.46 atm N 2, and atm NH 3. From these data calculate the equilibrium constant, K p, for N 2(g) + 3 H 2(g) 2 NH 3(g) (2.79 x 10-5 ) - 5 -
6 Practice Exercise 15.8 An aqueous solution of acetic acid is found to have the following equilibrium concentrations at 25 o C: [HC 2 H 3 O 2 ] = 1.65 x 10-2 M; [H + ] = 5.44 x 10-4 M; and [C 2 H 3 O 2 - ] = 5.44 x 10-4 M. Calculate the equilibrium constant, K c, for the ionization of acetic acid at 25 o C. The reaction is (1.79 x 10-5 ) HC 2 H 3 O 2(aq) H + (aq) + C 2 H 3 O 2 - (aq) Sample Exercise 15.9 (p. 643) A closed system initially containing x 10-3 M H 2 and x 10-3 M I 2 at 448 o C is allowed to reach equilibrium. Analysis of the equilibrium mixture shows that the concentration of HI is 1.87 x 10-3 M. Calculate K c at 448 o C for the reaction taking place, which is H 2(aq) + I 2(g) 2 HI (g) (1.81 x 10-5 ) - 6 -
7 Practice Exercise 15.9 Sulfur trioxide decomposes at high temperature in a sealed container: 2 SO 3(g) 2 SO 2(g) + O 2(g) Initially the vessel is charged at 1000 K with SO 3(g) at a partial pressure of atm. At equilibrium the SO 3 partial pressure is atm. Calculate the value of K p at 1000 K. (0.338) Sample Exercise (p. 645) At 448 o C the equilibrium constant, K c, for the reaction H 2(g) + I 2(g) 2 HI (g) is 51. Predict how the reaction will proceed to reach equilibrium at 448 o C if we start with 2.0 x 10-2 mol of HI, 1.0 x 10-2 mole of H 2, and 3.0 x 10-2 mol of I 2 in a 2.00-L container. (Q = 1.3, so reaction must proceed from left to right) - 7 -
8 Practice Exercise At 1000 K the value of K p for the reaction 2 SO 3(g) 2 SO 2(g) + O 2(g) is Calculate the value for Q p, and predict the direction in which the reaction will proceed toward equilibrium if the initial partial pressures of reactants are P SO3 = 0.16 atm; P SO2 = 0.41 atm; P O2 = 2.5 atm. (Q p = 16; Q p > K p, so reaction will proceed from right to left) Sample Exercise (p. 646) For the Haber process, N 2(g) + 3 H 2(g) 2 NH 3(g), K p = 1.45 x 10-5 at 500 o C. In an equilibrium mixture of the three gases at 500 o C, the partial pressure of H 2 is atm and that of N 2 is atm. What is the partial pressure of NH 3 in this equilibrium mixture? (2.24 x 10-3 atm) - 8 -
9 Practice Exercise At 500 K the reaction PCl 5(g) PCl 3(g) + Cl 2(g) has K p = In an equilibrium mixture at 500 K, the partial pressure of PCl 5 is atm and that of PCl 3 is atm. What is the partial pressure of Cl 2 in the equilibrium mixture? (1.22 atm) Sample Exercise (p. 646) A L flask is filled with mol of H 2 and mol of I 2 at 448 o C. The value of the equilibrium constant, K c, for the reaction H 2(g) + I 2(g) 2 HI (g) at 448 o C is What are the partial pressures of H 2, I 2, and HI in the flask at equilibrium? ([H 2 ] = M, [I 2 ] = M, [HI] = 1.87 M) - 9 -
10 Practice Exercise For the equilibrium, PCl 5(g) PCl 3(g) + Cl 2(g), the equilibrium constant, K p, has the value at 500 K. A gas cylinder at 500 K is charged with PCl 5(g) at an initial pressure of 1.66 atm. What are the equilibrium pressures of PCl 5, PCl 3, and Cl 2 at this temperature? (P PCl5 = atm, P PCl3 = P Cl2 = atm)
11 Consider the following equilibrium: N 2 O 4(g) 2 NO 2(g) Sample Exercise (p. 653) H o = 58.0 kj In what direction will the equilibrium shift when each of the following changes is made to a system at equilibrium: a) add N 2 O 4 b) remove NO 2 c) increase the total pressure by adding N 2(g) d) increase the volume e) decrease the temperature? Practice Exercise For the reaction PCl 5(g) PCl 3(g) + Cl 2(g) in what direction will the equilibrium shift when H o = 87.9 kj a) Cl 2(g) is removed; b) The temperature is decreased; c) The volume of the reaction system is increased; d) PCl 3(g) is added?
12 Sample Exercise (p. 653) a) Using the standard heat of formation data in Appendix C, determine the standard enthalpy change for the reaction N 2(g) + 3 H 2(g) 2 NH 3(g) b) Determine how the equilibrium constant for this reaction should change with temperature. Practice Exercise Using the thermodynamic data in Appendix C, determine the enthalpy change for the reaction 2 POCl 3(g) 2 PCl 3(g) + O 2(g) Use this result to determine how the equilibrium constant for the reaction should change with temperature
13 Sample Integrative Exercise 15 At temperatures near 800 o C, steam passed over hot coke (a form of carbon obtained from coal) reacts to form CO and H 2 : C (s) + H 2 O (g) CO (g) + H 2(g) The mixture of gases that results is an important industrial fuel called water gas. a) At 800 o C the equilibrium constant for this reaction is K p = What are the equilibrium partial pressures of H 2 O, CO, and H 2 in the equilibrium mixture at this temperature if we start with solid carbon and mol of H 2 O in a 1.00-L vessel? b) What is the minimum amount of carbon required to achieve equilibrium under these conditions? c) What is the total pressure in the vessel at equilibrium? d) At 25 o C the value of Keq for this reaction is 1.7 x Is the reaction exothermic or endothermic? e) To produce the maximum amount of CO and H 2 at equilibrium, should the pressure of the system be increased or decreased?
Chapter 15 Equilibrium
Chapter 15. Chemical Equilibrium Common Student Misconceptions Many students need to see how the numerical problems in this chapter are solved. Students confuse the arrows used for resonance ( )and equilibrium
More informationChapter 15 Equilibrium
Chapter 15. Chemical Equilibrium 15.1 The Concept of Equilibrium Chemical equilibrium is the point at which the concentrations of all species are constant. A dynamic equilibrium exists when the rates of
More informationChapter 15 Equilibrium
Chapter 15. Chemical Equilibrium Common Student Misconceptions Many students need to see how the numerical problems in this chapter are solved. Students confuse the arrows used for resonance ( )and equilibrium
More informationCHEMICAL EQUILIBRIUM. Chapter 15
Chapter 15 P a g e 1 CHEMICAL EQUILIBRIUM Examples of Dynamic Equilibrium Vapor above a liquid is in equilibrium with the liquid phase. rate of evaporation = rate of condensation Saturated solutions rate
More informationAP CHEMISTRY NOTES 8-1 CHEMICAL EQUILIBRIUM: AN INTRODUCTION
AP CHEMISTRY NOTES 8-1 CHEMICAL EQUILIBRIUM: AN INTRODUCTION Chemical Equilibrium a dynamic state in which the rate of the forward reaction and the rate of the reverse reaction in a system are equal (the
More informationA.P. Chemistry. Unit #11. Chemical Equilibrium
A.P. Chemistry Unit #11 Chemical Equilibrium I. Chemical Equilibrium the point in a reaction at which the concentrations of products and reactants remain constant Dynamic Equilibrium the equilibrium condition
More informationCHEMICAL EQUILIBRIUM. I. Multiple Choice 15 marks. 1. Reactions that can proceed in both the forward and reverse directions are said to be:
Name: Unit Test CHEMICAL EQUILIBRIUM Date: _ 50 marks total I. Multiple Choice 15 marks 1. Reactions that can proceed in both the forward and reverse directions are said to be: A. complete B. reversible
More information15.1 The Concept of Equilibrium
Lecture Presentation Chapter 15 Chemical Yonsei University 15.1 The Concept of N 2 O 4 (g) 2NO 2 (g) 2 Chemical equilibrium occurs when a reaction and its reverse reaction proceed at the same rate. The
More informationChapter 15 Chemical Equilibrium
Chapter 15 Chemical Chemical 15.1 The Concept of 15.2 The Constant (K) 15.3 Understanding and Working with Constants 15.4 Heterogeneous Equilibria 15.5 Calculating Constants 15.6 Applications of Constants
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. A) B) 1588 C) 397 D) 28 E) 0.
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The value of Keq for the equilibrium 1) H2 (g) + I2 (g) 2 HI (g) is 794 at 25 C. What
More informationReview Unit #11. Review Unit # H 2 O (g) + CO (g) H 2(g) + CO 2(g) H>1
Review Unit #11 1. H 2 O (g) + CO (g) H 2(g) + CO 2(g) H>1 K c = 1.6 What effect would these changes have on the equilibrium position? a. Cool the mixture b. Increase the volume of the flask c. Add H 2(g)
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. A) 1588 B) C) 28 D) 397 E) 0.
Chapter 15 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The value of Keq for the equilibrium 1) H2 (g) + I2 (g) 2 HI (g) is 794 at 25 C. What
More informationCHEMISTRY 12 UNIT II EQUILIBRIUM D Learning Goals
CHEMISTRY 12 UNIT II EQUILIBRIUM D Learning Goals 1. Chemical equilibrium is said to by dynamic because a. The reaction proceeds quickly b. The mass of the reactants is decreasing c. The macroscopic properties
More informationChemical Equilibrium Practice Problems #2
Chemical Equilibrium Practice Problems #2 2-20-2015 1. A CPHS student does an equilibrium experiment with the general chemical equation and derives the 2 graphs below: A = B: a. When at equilibrium is
More informationChapter 19 Chemical Thermodynamics
Chapter 19. Chemical Thermodynamics Sample Exercise 19.2 (p. 819) Elemental mercury is a silver liquid at room temperature. Its normal freezing point is -38.9 o C, and its molar enthalpy of fusion is H
More informationUNIT II - REVIEW EQUILIBRIA. Part I - Multiple Choice. 1. In which of the following does the entropy decrease?
CHEMISTRY 12 UNIT II - REVIEW EQUILIBRIA Part I - Multiple Choice 1. In which of the following does the entropy decrease? A. NaCl (s) Na + (aq) + Cl (aq) B. 4 NO (g) + 6 H 2 O (g) 4 NH 3 (g) + 5 O 2 (g)
More informationQUESTIONS: Equilibria AS & AS
QUESTION (2012:2) Phosphorus pentachloride gas, PCl 5 (g), decomposes to form phosphorus trichloride gas, PCl 3 (g), and chlorine gas, Cl 2 (g). The equilibrium can be represented as: PCl 5 (g) Ý PCl 3
More informationAP* Chapter 13. Chemical Equilibrium
AP* Chapter 13 Chemical Equilibrium Section 13.1 The Equilibrium Condition Chemical Equilibrium The state where the concentrations of all reactants and products remain constant with time. On the molecular
More information3 Chemical Equilibrium
Aubrey High School AP Chemistry 3 Chemical Equilibrium Name Period Date / / 3.1 Problems Chemical Analysis 1. Write the equilibrium constant expressions for the following reactions. How are they related
More informationc) Explain the observations in terms of the DYNAMIC NATURE of the equilibrium system.
Chemical Equilibrium - Part A: 1. At 25 o C and 101.3 kpa one mole of hydrogen gas and one mol of chlorine gas are reacted in a stoppered reaction vessel. After a certain time, three gases are detected
More informationC h a p t e r 13. Chemical Equilibrium
C h a p t e r 13 Chemical Equilibrium Chemical equilibrium is achieved when: the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products remain constant
More informationChemistry 192 Problem Set 2 Spring, 2018 Solutions
Chemistry 192 Problem Set 2 Spring, 2018 Solutions 1. The gas phase species NO 2 and N 2 O 4 equilibrate according to the reaction N 2 O 4(g) 2NO 2(g), and it is found that at 298K in a reaction vessel
More informationJanuary 03, Ch 13 SB equilibrium.notebook
Ch 13: Chemical Equilibrium exists when 2 opposing reactions occur simultaneously at the same rate (dynamic rather than static) Forward rate = reverse rate https://www.youtube.com/watch?v=wld_imyqagq The
More informationCh 6 Practice Problems
Ch 6 Practice Problems 1. Which of the following statements is true? A) When two opposing processes are proceeding at identical rates, the sstem is at equilibrium. B) Catalsts are an effective means of
More informationChemistry 12: Dynamic Equilibrium Practice Test
Chemistry 12: Dynamic Equilibrium Practice Test A. Multiple Choice: For each question, select the best answer and record your choice on the answer key provided. /25 1) A system at equilibrium is said to
More informationChemical Equilibrium
Chemical Equilibrium Concept of Equilibrium Equilibrium Constant Equilibrium expressions Applications of equilibrium constants Le Chatelier s Principle The Concept of Equilibrium The decomposition of N
More informationEquilibrium Multiple Choice
Equilibrium Multiple Choice January 1999 7. Consider the following graph: When equilibrium is reached, the rate of the forward reaction is A. 0.00 mol/min B. 0.25mol/min C. 1.0 mol/min D. 3.0 mol/min 8.
More informationClass Results Simulator:
Class Results http://chemconnections.org/general/chem120/equil-graph.html Simulator: http://chemconnections.org/java/equilibrium/ http://chemconnections.org/general/chem120/equil-graph.html The changes
More informationa) Write the expression for the equilibrium constant, K eq
Chemistry 12 K eq Calculations Worksheet Name: Date: Block: 1. Given the equilibrium equation below: A 2(g) + B 2(g) 2AB (g) If, at equilibrium, the concentrations are as follows: [A 2] = 3.45 M, [B 2]
More information1. The Haber- Bosch Process 2. K eq
Chemistry 12 Equilibrium III Name: Date: Block: 1. The Haber- Bosch Process 2. K eq The Haber- Bosch Process Almost all of the world s ammonia is produced via the Haber- Bosch process and almost all of
More informationCHEMICAL EQUILIBRIA: GENERAL CONCEPTS
CHEMICAL EQUILIBRIA: GENERAL CONCEPTS THE NATURE OF THE EQUILIBRIUM STATE: Equilibrium is the state where the concentrations of all reactants and products remain constant with time. (in stoichiometry,
More informationChapter 6: Chemical Equilibrium
Chapter 6: Chemical Equilibrium 6.1 The Equilibrium Condition 6.2 The Equilibrium Constant 6.3 Equilibrium Expressions Involving Pressures 6.4 The Concept of Activity 6.5 Heterogeneous Equilibria 6.6 Applications
More informationK P VERSUS K C PROPERTIES OF THE EQUILIBRIUM CONSTANT
K P VERSUS K C 1. What are the units of K p and K c for each of the following? a) 2H 2 S(g) 2H 2 (g) + S 2 (g) b) 4NH 3 (g) + 3O 2 (g) 2N 2 (g) + 6H 2 O(g) 2. What are the units of K p and K c for each
More informationand mol of Cl 2 was heated in a vessel of fixed volume to a constant temperature, the following reaction reached equilibrium.
Q1. When a mixture of 0.45 mol of PCl and 0.68 mol of Cl was heated in a vessel of fixed volume to a constant temperature, the following reaction reached equilibrium. PCl + Cl PCl 5 H = 9 kj mol 1 At equilibrium,
More informationEquilibrium point of any reaction is characterized by a single number: K eq is the equilibrium constant for the reaction
Lecture 19 Equilibrium Constant Equilibrium oint of any reaction is characterized by a single number: K eq is the equilibrium constant for the reaction In general: ja + kb R + qs K eq [ R] [ S] [ A] [
More informationChemical Equilibrium
Chemical Equilibrium What is equilibrium? Expressions for equilibrium constants, K eq ; Calculating K eq using equilibrium concentrations; Factors that affect equilibrium; Le Chatelier s Principle What
More informationEquilibrium. Reversible Reactions. Chemical Equilibrium
Equilibrium Reversible Reactions Chemical Equilibrium Equilibrium Constant Reaction Quotient Le Chatelier s Principle Reversible Reactions In most chemical reactions, the chemical reaction can be reversed,
More informationChemical Equilibrium. Chapter
Chemical Equilibrium Chapter 14 14.1-14.5 Equilibrium Equilibrium is a state in which there are no observable changes as time goes by. Chemical equilibrium is achieved when: 1.) the rates of the forward
More information2.0 Equilibrium Constant
2.0 Equilibrium Constant When reactions are reversible and chemical equilibrium is reached, it is important to recognize that not all of the reactants will be converted into products. There is a mathematical
More informationEquilibrium Written Response
Equilibrium Written Response January 1998 2. Consider the following equilibrium: CS2 (g) + 3Cl2 (g) CCl4 (g) + S2Cl2 (g) ΔH = -238 kj a) Sketch a potential energy diagram for the reaction above and label
More informationName Chem 6 Section #
Equilibrium Constant and its Meaning 1. Write the expressions for K eq for the following reactions. a) CH 4 (g) + 2 H 2 S(g) CS 2 (g) + 4 H 2 (g) b) 2 N 2 O 5 (g) 4 NO 2 (g) + O 2 (g) c) 3 O 2 (g) 2 O
More informationREACTION EQUILIBRIUM
REACTION EQUILIBRIUM A. REVERSIBLE REACTIONS 1. In most spontaneous reactions the formation of products is greatly favoured over the reactants and the reaction proceeds to completion (one direction). In
More informationAP Chemistry Chapter 16 Assignment. Part I Multiple Choice
Page 1 of 7 AP Chemistry Chapter 16 Assignment Part I Multiple Choice 1984 47. CH 4 (g) + 2 O 2 (g) CO 2 (g) + 2 H 2 O(l) H = 889.1 kj H f H 2 O(l) = 285.8 kj mol 1 H f CO 2 (g) = 393.3 kj mol 1 What is
More informationALE 9. Equilibrium Problems: ICE Practice!
Name Chem 163 Section: Team Number: ALE 9. Equilibrium Problems: ICE Practice! (Reference: 17.5 Silberberg 5 th edition) Equilibrium Calculations: Show all work with correct significant figures. Circle
More informationCalculations Involving the Equilibrium Constant K eq )
Calculations Involving the Equilibrium Constant K eq ) 1. Given the equilibrium equation below: A 2(g) + B 2(g) 2AB (g) If, at equilibrium, the concentrations are as follows: [A 2 ] = 3.45 M, [B 2 ] =
More informationLe Châtelier s Principle. 19 Copyright Pearson Education, Inc., or its affiliates. All Rights Reserved. Equilibrium: Le Châtelier s Principle
Factors Affecting : Le Châtelier s Principle Pressure Factors Affecting : Le Châtelier s Principle Pressure When volume decreases, the pressure increases. systems in which some reactants and products are
More informationHOMEWORK 1C. (d) 2D + E 2F K eq = 1 x 10 9 I C E
HOMEWORK 1A 1. Write the correct equilibriumconstant expressions for the following reactions. (a) 4NH 3 (g) + 7O 2 (g) 4NO 2 (g) + 6H 2 O (g) (b) 2NO 2 (g) + 7H 2 (g) 2NH 3 (g) + 4H 2 O (g) (c) NH 4 Cl
More informationThe Equilibrium Law. Calculating Equilibrium Constants. then (at constant temperature) [C] c. [D] d = a constant, ( K c )
Chemical Equilibrium 1 The Equilibrium Law States If the concentrations of all the substances present at equilibrium are raised to the power of the number of moles they appear in the equation, the product
More informationLecture Presentation. Chapter 15. Chemical Equilibrium. James F. Kirby Quinnipiac University Hamden, CT Pearson Education
Lecture Presentation Chapter 15 Chemical James F. Kirby Quinnipiac University Hamden, CT The Concept of N 2 O 4 (g) 2 NO 2 (g) Chemical equilibrium occurs when a reaction and its reverse reaction proceed
More informationKinetics & Equilibrium Review Packet. Standard Level. 1. Which quantities in the enthalpy level diagram are altered by the use of a catalyst?
Kinetics & Equilibrium Review Packet Standard Level 1. Which quantities in the enthalpy level diagram are altered by the use of a catalyst? Enthalpy I II III Time A. I and II only B. I and III only C.
More informationQ.1 Write out equations for the reactions between...
1 CHEMICAL EQUILIBRIUM Dynamic Equilibrium not all reactions proceed to completion some end up with a mixture of reactants and products this is because some reactions are reversible; products revert to
More informationAP Chapter 14: Chemical Equilibrium & Ksp
AP Chapter 14: Chemical Equilibrium & Ksp Warm-Ups (Show your work for credit) Name Date 1. Date 2. Date 3. Date 4. Date 5. Date 6. Date 7. Date 8. AP Chapter 14: Chemical Equilibrium & Ksp 2 Warm-Ups
More informationCHEMICAL EQUILIBRIUM Chapter 13
1 CHEMICAL EQUILIBRIUM Chapter 13 Pb 2+ (aq) + 2 Cl (aq) PbCl 2 (s) 1 Objectives Briefly review what we know of equilibrium Define the Equilibrium Constant (K eq ) and Reaction Quotient (Q) Determining
More informationChemical Equilibrium
Chemical Equilibrium 1 Equilibrium We ve already used the phrase equilibrium when talking about reactions. In principle, every chemical reaction is reversible... capable of moving in the forward or backward
More informationDr. Valverde s AP Chemistry Class
AP* Chemistry Dr. Valverde s AP Chemistry Class Chapter CHEMICAL 13 Review: EQUILIBRIA: Chemical Equilibrium GENERAL CONCEPTS THE NATURE OF THE EQUILIBRIUM STATE: Equilibrium is the state where the rate
More information1.6 Chemical equilibria and Le Chatelier s principle
1.6 Chemical equilibria and Le Chatelier s principle Reversible reactions: Consider the reaction: Mg(s) + H2SO4(aq) MgSO4(aq) + H2(g) The reaction stops when all of the limiting reagent has been used up.
More informationThe Equilibrium State. Chapter 13 - Chemical Equilibrium. The Equilibrium State. Equilibrium is Dynamic! 5/29/2012
Chapter 13 - Chemical Equilibrium The Equilibrium State Not all chemical reactions go to completion; instead they attain a state of equilibrium. When you hear equilibrium, what do you think of? Example:
More informationWhich of the following factors will not alter the position of equilibrium?
86 N( g) + 3H $ ( g) NH3 ( g) Which of the following factors will not alter the position of uilibrium? A a pressure decrease B a temperature increase C the presence of a catalyst D the addition of more
More informationCHEMICAL EQUILIBRIUM. 6.3 Le Chatelier s Principle
CHEMICAL EQUILIBRIUM 6.3 Le Chatelier s Principle At the end of the lesson, students should be able to: a) State Le Chatelier s principle b) Explain the effect of the following factors on a system at equilibrium
More informationChemical Equilibria 2
Chemical Equilibria 2 Reading: Ch 14 sections 6-9 Homework: Chapter 14: 27*, 29*, 31, 33, 41, 43, 45, 51*, 55, 61*, 63, 67*, 69* * = important homework question Review A chemical equilibrium and its respective
More informationChemical Equilibria & the Application of Le Châtelier s Principle to General Equilibria
Chemical Equilibria & the Application of Le Châtelier s Principle to General Equilibria CHEM 102! T. Hughbanks! Example of Equilibrium N 2 (g) + 3H 2 (g) 2 NH 3 (g) Reactions can occur, in principle, in
More informationThe Equilibrium State
15.1 The Equilibrium State All reactions are reversible and under suitable conditions will reach a state of equilibrium. At equilibrium, the concentrations of products and reactants no longer change because
More informationThe reactions we have dealt with so far in chemistry are considered irreversible.
1. Equilibrium Students: model static and dynamic equilibrium and analyse the differences between open and closed systems investigate the relationship between collision theory and reaction rate in order
More informationCHEMISTRY 12 UNIT II EQUILIBRIUM
CHEMISTRY 12 UNIT II EQUILIBRIUM F: Dynamic Equilibrium (The Quantitative Approach) It is expected that students will be able to F1: The Equilibrium Constant - Gather and interpret data on the concentration
More informationChemical Equilibrium. A state of no net change in reactant & product concentrations. There is a lot of activity at the molecular level.
Chemical Equilibrium A state of no net change in reactant & product concentrations. BUT There is a lot of activity at the molecular level. 1 Kinetics Equilibrium For an elementary step in the mechanism:
More informationAP Study Questions
Class: Date: AP 19.5-19.7 Study Questions Multiple Choice Identify the choice that best completes the statement or answers the question. 3. The value of G at 25 C for the formation of POCl 3 from its constituent
More informationAP Chem Chapter 12 Notes: Gaseous Equilibrium
AP Chem Chapter 12 Notes: Gaseous Equilibrium Equilibrium I. Equilibrium is reached when both the and reactions are occurring at. A. Dynamic Equilibrium: reactions are still occurring but the of reactants
More informationThe Extent of Chemical Reactions
Equilibrium: The Extent of Chemical Reactions The Equilibrium State and the Equilibrium Constant The Reaction Quotient and the Equilibrium Constant Equilibrium: The Extent of Chemical Reactions Expressing
More informationName AP CHEM / / Collected AP Exam Essay Answers for Chapter 16
Name AP CHEM / / Collected AP Exam Essay Answers for Chapter 16 1980 - #7 (a) State the physical significance of entropy. Entropy (S) is a measure of randomness or disorder in a system. (b) From each of
More informationEQUILIBRIUM CONSTANT, K eq or K. The Law of Chemical Equilibrium: (Guldberg & Waage, 1864)
1 EQUILIBRIUM CONSTANT, K eq or K The Law of Chemical Equilibrium: (Guldberg & Waage, 1864) States that: At equilibrium, there is a constant ratio between the concentration of the products and the concentration
More information1301 Dynamic Equilibrium, Keq,
1301 Dynamic Equilibrium, Keq, and the Mass Action Expression The Equilibrium Process Dr. Fred Omega Garces Chemistry 111 Miramar College 1 Equilibrium Concept of Equilibrium & Mass Action Expression Extent
More informationCHEM 1423 Chapter 17 Homework Questions TEXTBOOK HOMEWORK
CHEM 1423 Chapter 17 Homework Questions TEXTBOOK HOMEWORK 17.29 At 425 o C, Kp = 4.18x10-9 for the reaction 2HBr(g) H 2 (g) + Br 2 (g) In one experiment, 0.20 atm of HBr(g), 0.010 atm of H 2 (g), and 0.010
More information8. The table below describes two different reactions in which Reaction 1 is faster. What accounts for this observation? Reaction 1 Reaction 2.
Public Review - Rates and Equilibrium June 2005 1. What does X represent in the diagram below? (A) activation energy for the forward reaction (B) activation energy for the reverse reaction (C) heat of
More informationChapter 15. Chemical Equilibrium
Chapter 15. Chemical Equilibrium 15.1 The Concept of Equilibrium Consider colorless frozen N 2 O 4. At room temperature, it decomposes to brown NO 2. N 2 O 4 (g) 2NO 2 (g) At some time, the color stops
More informationChemical Kinetics and Equilibrium
Chemical Kinetics and Equilibrium 1 Which statement incorrectly describes a chemical reaction approaching equilibrium? As a chemical reaction approaches equilibrium, the net change in the amount of reactants
More informationRepresentative Exam Questions On The Topic of Equilibrium (Includes Acid / Base Equilibria)
Representative Exam Questions On The Topic of Equilibrium (Includes Acid / Base Equilibria) 1. If a chemical equilibrium very much favors the products over the reactants, what would we expect its equilibrium
More informationChp 13, 14, 15 SHOW ALL WORK AND CIRCLE FINAL ANSWERS. a) 1 only b) 2 only c) 3 only d) 1 and 2 only e) 1, 2, and H 2
Chp 13, 14, 15 Name: SHOW ALL WORK AND CIRCLE FINAL ANSWERS 1. Which of the following factors affect the initial rate of a reaction? 1) The nature of the reactants. 2) The concentration of the reactants.
More informationAP* Thermodynamics Free Response Questions page 1. Essay Questions
AP* Thermodynamics Free Response Questions page 1 Essay Questions 1991 The reaction represented above is a reversible reaction. BCl 3 (g) + NH 3 (g) Cl 3 BNH 3 (s) (a) Predict the sign of the entropy change,
More informationChemical Equilibrium
Chemical Equilibrium Chemical Equilibrium The Concept of Equilibrium (15.1) Ways of Expressing Equilibrium Constants (15.2) What Does the Equilibrium Constant Tell Us? (15.3) Factors that Affect Chemical
More informationCHEMpossible. Final Exam Review
CHEMpossible Final Exam Review 1. Given the following pair of reactions and their equilibrium constants: 2NO 2 (g) 2NO (g) + O 2 (g) K c = 15.5 2NO (g) + Cl 2 (g) 2 NOCl (g) K c = 3.20 10-3 Calculate a
More informationChapter 15 Chemical Equilibrium. Equilibrium
Chapter 15 Chemical The Concept of Chemical equilibrium occurs when a reaction and its reverse reaction proceed at the same rate. The Concept of As a system approaches equilibrium, both the forward and
More informationPrimary Topics in Equilibrium
Primary Topics in Equilibrium Outline 1. Equilibrium Expression 2. Calculating Concentration Given K 3. Calculating K Given Concentration Review 1. Equilibrium Expression (only gas and aqueous do not include
More informationCHEMISTRY 12 EQUILIBRIUM PROPERTIES & ENTROPY AND ENTHALPY WORKSHEET CHEMISTRY 12 EQUILIBRIUM PROPERTIES WORKSHEET
CHEMISTRY 12 EQUILIBRIUM PROPERTIES & ENTROPY AND ENTHALPY WORKSHEET CHEMISTRY 12 EQUILIBRIUM PROPERTIES WORKSHEET 1) Write six statements that apply to all chemical equilibrium systems. (2 marks) System
More information6. Which expression correctly describes the equilibrium constant for the following reaction? 4NH 3 (g) + 5O 2 (g) 4NO(g) + 6H 2 O(g)
1. Which of the following can we predict from an equilibrium constant for a reaction? 1. The extent of a reaction 2. Whether the reaction is fast or slow 3. Whether a reaction is exothermic or endothermic
More informationName: Name: Page 1 of 6
Name: Name: Name: Name: Worksheet 10: Q, Adding Equations, Equilibrium Calculations, and Le Châtelier Objectives: To be able to calculate Q, the reaction quotient, and know what it means. To be able to
More information3. Indicate the mass action expression for the following reaction: 2X(g) + Y(g) 3W(g) + V(g) a) [X] 2 [Y][W] 3 [V] [W] 3 [V] [X] 2 [Y] [3W][V] [2X][Y]
1. Which of the following statements concerning equilibrium is not true? a) A system that is disturbed from an equilibrium condition responds in a manner to restore equilibrium. b) Equilibrium in molecular
More informationChapter 15. Chemical Equilibrium
Chapter 15. Chemical Equilibrium 15.1 The Concept of Equilibrium Consider colorless frozen N 2 O 4. At room temperature, it decomposes to brown NO 2. N 2 O 4 (g) 2NO 2 (g) At some time, the color stops
More informationAll reversible reactions reach an dynamic equilibrium state.
11. Equilibrium II Many reactions are reversible + 3 2 All reversible reactions reach an dynamic equilibrium state. Dynamic equilibrium occurs when forward and backward reactions are occurring at equal
More information(b) Describe, and explain, what would happen to the position of the NO 2 /N 2 O 4 equilibrium if the following changes are made
1. Nitrogen dioxide, NO 2, and dinitrogen tetroxide, N 2 O 4, take part in the following equilibrium. 2NO 2 (g) N 2 O 4 (g) ΔH = 58 kj mol 1 (a) State le Chatelier s principle. (b) Describe, and explain,
More informationK eq. b) 4 HCl (g) + O 2(g) 2 H 2 O (g) + 2 Cl 2(g) c) NOCl (g) NO (g) + ½ Cl 2(g) 1. d) Fe 3+ (aq) + SCN (aq) FeSCN 2+ (aq)
Name: 1 Equilibrium Worksheet SOLUTIONS Complete the following questions on a separate piece of paper. 1. Write the uilibrium epression,, for each of the following reactions: a) NO (g) + O (g) NO (g) [
More informationEquilibrium means that the rxn rates are equal. evaporation H20(l) condensation
Reversible reactions Most chemical reactions are reversible they can occur backwards as well as forwards reactants products Consider an open container of water (non-equilibrium) A closed water bottle is
More informationChemical reactions with large K c (also K p) effectively go 100% to products.
th 7 Homework: Reading, M&F, ch. 13, pp. 506-524 (applications of equilibrium constants, Le Chatelier s Principle). Problems: Nakon, ch. 17, #9, 10, 12-15, 17, 24, 34; M&F, ch. 13, #41, 42, 44, 49, 51,
More informationREACTION RATES AND REVERSIBLE REACTIONS
NAME SCHOOL INDEX NUMBER DATE REACTION RATES AND REVERSIBLE REACTIONS 1. 1989 Q 4 P1 The graph shows the loss in total mass of a mixture of marble chips and dilute hydrochloric acid with time at 250C Loss
More informationChapter 18. Reversible Reactions. A chemical reaction in which the products can react to re-form the reactants is called a reversible reaction.
Section 1 The Nature of Chemical Equilibrium Reversible Reactions A chemical reaction in which the products can react to re-form the reactants is called a reversible reaction. Section 1 The Nature of Chemical
More information3 A (aq) + 2 D (aq) 4 C (g) + B (s) + 2 E (l)
AP Chemistry Test (Chapter 13) Multiple Choice (20%) 1) Which one best describes the K C for this reaction? 3 A (aq) + 2 D (aq) 4 C (g) + B (s) + 2 E (l) A) K c = [A] 3 [D] 2 B) K c = [C] 4 [B][E] 2 [C]
More information2nd- Here's another example of a reversible reaction - dissolving salt in a beaker of water, described by the following reaction: NaCl (s)
CHEMICAL EQUILIBRIUM AP Chemistry (Notes) Most chemical processes are reversible. Reactants react to form products, but those products can also react to form reactants. Examples of reversible reactions:
More informationDYNAMIC EQUILIBRIUM STUDY GUIDE multiple choice
DYNAMIC EQUILIBRIUM STUDY GUIDE multiple choice Multiple Choice Section: This study guide is a compilation of questions from provincial exams since April 1994. I urge you to become intimately familiar
More information(g) + 3 H 2. (g) 2 NH 3. 1) Only gases and dissolved species appear in an equilibrium expression. 4 NH 3. O(g) K c = (s) + 2N 2.
Chapter 16: Chemical Equilibrium What is meant by an equilibrium system? What is an equilibrium expression? N 2 +3 H 2 2 NH 3 1) Only gases and dissolved species appear in an equilibrium expression. 4
More information3 A (aq) + 2 D (aq) + 5 C (s) <==> 3 B (aq) + 4 E (aq) + 2 G (ppt)
AP Chemistry Test (Chapter 13) Multiple Choice (30%) 1) Which one best describes the K C for this reaction? 3 A (aq) + 2 D (aq) + 5 C (s) 3 B (aq) + 4 E (aq) + 2 G (ppt) A) K c = [A] 3 [D] 2 B) K
More informationChapter 6: Chemical Equilibrium
Chapter 6: Chemical Equilibrium 6.1 The Equilibrium Condition 6. The Equilibrium Constant 6.3 Equilibrium Expressions Involving Pressures 6.4 The Concept of Activity 6.5 Heterogeneous Equilibria 6.6 Applications
More information