Question 1

What is the mass-action expression, Qc , for the following chemical reaction? Cu2+(aq) + 4NH3(aq)   Cu(NH3)42+(aq)

Accepted Answer

A)    
B)    
C)    
D)    
E)  None of the above is the correct mass-action expression. 
A)    
B)    
C)    
D)    
E)  None of the above is the correct mass-action expression.

Question 2

What is the mass-action expression, Qc , for the following chemical reaction? PbO(s) + CO(g)   Pb(l) + CO2(g)

Accepted Answer

A)    
B)    
C)    
D)    
E)  None of the above expressions is correct. 
A)    
B)    
C)    
D)    
E)  None of the above expressions is correct.

Question 3

When a chemical system is at equilibrium,

Accepted Answer

A)  the concentrations of the reactants are equal to the concentrations of the products. 
B)  the concentrations of the reactants and products have reached constant values. 
C)  the forward and reverse reactions have stopped. 
D)  the reaction quotient, Q, has reached a maximum. 
E)  the reaction quotient, Q, has reached a minimum. 
A)  the concentrations of the reactants are equal to the concentrations of the products. 
B)  the concentrations of the reactants and products have reached constant values. 
C)  the forward and reverse reactions have stopped. 
D)  the reaction quotient, Q, has reached a maximum. 
E)  the reaction quotient, Q, has reached a minimum.

Question 4

Carbon monoxide and chlorine combine in an equilibrium reaction to produce the highly toxic product, phosgene (COCl2) CO(g) + Cl2(g)    
COCl2(g)
If the equilibrium constant for this reaction is Kc = 248, predict, if possible, what will happen when the reactants and product are combined with the concentrations shown.
[CO] = [Cl2] = 0.0200 M; [COCl2] = 0.0992 M

Accepted Answer

A)  The reaction will proceed to the right. 
B)  The reaction will proceed to the left. 
C)  The reaction is at equilibrium, and no change in concentrations will occur. 
D)  The container volume needs to be specified before a prediction can be made. 
E)  The temperature needs to be specified before a prediction can be made. 
A)  The reaction will proceed to the right. 
B)  The reaction will proceed to the left. 
C)  The reaction is at equilibrium, and no change in concentrations will occur. 
D)  The container volume needs to be specified before a prediction can be made. 
E)  The temperature needs to be specified before a prediction can be made.

What is the mass-action expression, Q_c, for the following chemical reaction? Cu²⁺(aq) + 4NH₃(aq) Cu(NH₃)₄²⁺(aq)

What is the mass-action expression, Q_c, for the following chemical reaction? PbO(s) + CO(g) Pb(l) + CO₂(g)

When a chemical system is at equilibrium,

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 17: Equilibrium: the Extent of Chemical Reactions

What is the mass-action expression, Qc , for the following chemical reaction? Cu2+(aq) + 4NH3(aq) Cu(NH3)42+(aq)

What is the mass-action expression, Qc , for the following chemical reaction? PbO(s) + CO(g) Pb(l) + CO2(g)

When a chemical system is at equilibrium,

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

What is the mass-action expression, Q_c, for the following chemical reaction? Cu²⁺(aq) + 4NH₃(aq) Cu(NH₃)₄²⁺(aq)

What is the mass-action expression, Q_c, for the following chemical reaction? PbO(s) + CO(g) Pb(l) + CO₂(g)