What does the word equilibrium mean to you? Warm Up.
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Transcript of What does the word equilibrium mean to you? Warm Up.
![Page 1: What does the word equilibrium mean to you? Warm Up.](https://reader035.fdocuments.in/reader035/viewer/2022062417/55149ddf550346f06e8b58c4/html5/thumbnails/1.jpg)
What does the word equilibrium mean to you?
Warm Up
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Chapter 18.2Reversible Reactions and
Equilibrium
Darren Dressen
Chemistry CP
Los Altos High School
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Key Concepts/Tasks
What does chemical equilibrium really mean and how does an equilibrium change with time?
Be capable of writing an equilibrium expression by just looking at a reaction.
What does the value of Keq indicate about the equilibrium position of a reaction?
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Vocabulary
Reversible Reaction Chemical Equilibrium Equilibrium Position
Equilibrium Constant, Keq
Le Chatelier’s Principle (later)
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Khan’s Academy
Chapter 18.1 - Introduction to Kinetics/Reaction Rates
Chapter 18.2 - Reversible Reactions and Equilibrium
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Reversible Reaction
2SO2(g) + O2(g) 2SO3(g)
Forward Reaction
Reverse Reaction
2SO2(g) + O2(g) 2SO3(g)
2SO2(g) + O2(g) 2SO3(g)
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Chemical Equilibrium
At chemical equilibrium, no net change occurs in the actual amounts of the components
(reactants and products) of the system (chemical reaction).
A common misconception: Once a reaction is at equilibrium everything stops
Equilibrium is a dynamic process … the reaction does not stop
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Equilibrium Position
A B(20%) (80%)
A(80%)
B(20%)
Equilibrium does not mean 50:50!
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Equilibrium Position:Kf and Kr rate constants
A B(20%) (80%)
Kf
kr
Kf is the rate constant for the forward reactionKr is the rate constant for the reverse reaction
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Equilibrium Constant, Keq
The equilibrium constant (Keq) is the ratio of product concentrations to reactant concentrations at equilibrium.
Keq is derived from Kf and Kr …..
Keq = Kf/Kr
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Solving for Keq
aA + bB cC + dD
Moles of B
Moles of D
Concentration of B (M)
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Exception
If a molecule in the reaction is a pure solid or pure liquid, then it is removed from the equilibrium expression.
2Ag(s) + CuCl2(aq) Cu(s) + 2AgCl(aq)
Keq = [AgCl]2
[CuCl2]
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Why don’t solids and liquids count?
Since concentrations of pure liquids and solids remain constant, these substances can be ignored in equilibrium constant expression.
Known as a heterogeneous equilibrium
Concept question??? What is the difference between a homogeneous and heterogeneous equilibrium?
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What Keq Tells Us
aA + bB cC + dD
If Keq > 1; More products at equilibriumIf Keq < 1; More reactants at equilibrium
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Cool Down
H2(g) + I2(g) 2 HI(g)
What is the equilibrium expression for this reaction?
What is the equilibrium expression for this reaction?
SnO2(s) + 2CO(g) Sn(s) + 2CO2(g)
Keq =[HI]2
[H2] x [I2]
Keq =[CO2]2
[CO]2