Ch.14 - Chemical EquilibriumWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds
Problem

Consider the following reaction at equilibrium:

2 CO2(g) ⇌ 2 CO(g) + O2(g)                ∆H° = –514 kJ

The prediction is that adding O2(g) to the reaction container will lead to a(n):

A. increase in the partial pressure of CO(g)

B. decrease in the partial pressure of CO2(g)

C. increase in the value of the equilibrium constant

D. increase in the partial pressure of CO2(g)

E. decrease in the value of the equilibrium constant

Solution

We are asked to predict what happens when we add O2(g) to the reaction.


2 CO2(g) ⇌ 2 CO(g) + O2(g)                ∆H° = –514 kJ


According to Le Chatelier’s Principle, if a system (chemical reaction) is at equilibrium and we disturb it, then the system will readjust to maintain its equilibrium state.



When we add reactants or remove products the chemical reaction will shift in the forward direction to re-establish equilibrium. This causes an increase in the products and a decrease in the reactants. 

Products-Reactant-Forward-Direction


Products and Reactants (Forward Direction)


When we remove reactants or add products the chemical reaction will shift in the reverse direction to re-establish equilibrium. This causes a decrease in the products and an increase in the reactants. 

Products-Reactants-Reverse

Products and Reactants (Reverse Direction)


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