Equilibrium
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Dynamic equilibrium
SubtopicDynamic equilibrium under Equilibrium for Grade 11 IB.
Preview questions (no answers)
- 1.
If the equilibrium constant for a reaction is very large, what does this say about the equilibrium position?
A.It lies far to the right (products favored)
B.It lies far to the left (reactants favored)
C.Equilibrium cannot be reached
D.The reaction is very slow
- 2.
Which of the following describes a system that has reached equilibrium starting from pure reactants?
A.The concentration of products has reached its maximum possible value
B.The concentration of reactants has reached zero
C.The reaction rate forward is zero
D.The reaction rate reverse is equal to the forward rate
- 3.
In a reaction mixture at equilibrium, if you were to look at the molecules at a microscopic level, what would you see?
A.Molecules frozen in place
B.Reactants only
C.Products only
D.Molecules constantly reacting in both directions
- 4.
What is the relationship between the Gibbs free energy change () and a system at equilibrium?
A.is at its maximum positive value
B.is zero
C.is equal to the enthalpy change
D.is always negative and decreasing
- 5.
Which graph correctly represents the change in rates of forward and reverse reactions as a system approaches equilibrium?
A.Forward rate increases, reverse rate decreases until they are equal.
B.Forward rate decreases, reverse rate increases until they are equal.
C.Both rates increase until they reach a maximum.
D.Forward rate remains constant while reverse rate increases.
- 6.
For a reaction with , which of the following is the most accurate description of the reaction mixture at equilibrium?
A.It contains mostly reactants.
B.It contains mostly products.
C.It contains equal amounts of reactants and products.
D.The reaction has not yet started.
- 7.
How does the addition of an inert gas at constant volume affect the equilibrium ?
A.Shifts the equilibrium to the right.
B.Shifts the equilibrium to the left.
C.Has no effect on the equilibrium position.
D.Increases the value of .
- 8.
Given for , what is the concentration of when at equilibrium?
A.B.C.D. - 9.
A flask contains an equilibrium mixture of , , and . If the flask is opened to the atmosphere, what happens to the equilibrium?
A.It remains in dynamic equilibrium.
B.The rate of the reverse reaction becomes zero.
C.It is no longer a closed system, so equilibrium is lost.
D.The value of changes.
- 10.
For a reaction where is very small (), which statement is correct?
A.The reaction goes almost to completion.
B.The equilibrium mixture consists almost entirely of reactants.
C.The rate of the forward reaction is zero.
D.The activation energy of the forward reaction is zero.
Download the worksheet for Equilibrium - Dynamic equilibrium to practice offline. It includes additional chapter-level practice questions.
The state of dynamic equilibrium
SubtopicThe state of dynamic equilibrium under Equilibrium for Grade 11 IB.
Preview questions (no answers)
- 1.
Dynamic equilibrium can be established in which type of change?
A.Only chemical changes.
B.Only physical changes.
C.Both chemical and physical changes.
D.Neither chemical nor physical changes.
- 2.
In the reaction , what happens to the rate of the forward reaction as and are consumed?
A.It increases.
B.It decreases.
C.It remains constant until the end.
D.It oscillates up and down.
- 3.
Which statement about the concentration of reactants at equilibrium is correct?
A.It must be equal to the concentration of products.
B.It must be zero.
C.It must be constant.
D.It must be exactly half of the initial concentration.
- 4.
A system where the rate of the forward process equals the rate of the reverse process is called:
A.An endothermic state.
B.A dynamic equilibrium.
C.An irreversible state.
D.A stoichiometric balance.
- 5.
Which of the following is NOT a characteristic of a system at equilibrium?
A.The rate of the forward reaction equals the rate of the reverse reaction.
B.The concentrations of reactants and products are equal.
C.Macroscopic properties remain constant.
D.The system is closed.
- 6.
If the reaction has , which statement is most accurate?
A.The reaction is essentially complete.
B.The equilibrium mixture contains mostly reactants.
C.The equilibrium mixture contains mostly products.
D.The reaction does not occur at all.
- 7.
Which of the following would NOT be included in the expression for a reaction occurring in aqueous solution?
A.A dissolved gas
B.An aqueous ion
C.A pure liquid solvent (like in dilute solution)
D.A dissolved solid
- 8.
Which of the following is correct regarding the effect of temperature on the rate of reaching equilibrium and the position of equilibrium for an exothermic reaction?
A.Higher temperature: Equilibrium reached faster, more products formed
B.Higher temperature: Equilibrium reached slower, more reactants formed
C.Higher temperature: Equilibrium reached faster, more reactants formed
D.Lower temperature: Equilibrium reached faster, more products formed
- 9.
For the equilibrium , the enthalpy change is kJ. If the temperature is increased, how do the values of and the partial pressure of change?
A.increases, increases
B.decreases, decreases
C.increases, decreases
D.decreases, increases
- 10.
A reaction has . If the concentration of is M and is M, and a catalyst is added, what happens to the ratio ?
A.Increases
B.Decreases
C.Remains at
D.Becomes
Download the worksheet for Equilibrium - The state of dynamic equilibrium to practice offline. It includes additional chapter-level practice questions.
The equilibrium law (HL)
SubtopicThe equilibrium law (HL) under Equilibrium for Grade 11 IB.
Preview questions (no answers)
- 1.
- The equilibrium law (HL): practice question 1 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 2.
- The equilibrium law (HL): practice question 2 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 3.
- The equilibrium law (HL): practice question 3 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 4.
- The equilibrium law (HL): practice question 4 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 5.
- The equilibrium law (HL): practice question 5 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 6.
- The equilibrium law (HL): practice question 6 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 7.
- The equilibrium law (HL): practice question 7 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 8.
- The equilibrium law (HL): practice question 8 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 9.
- The equilibrium law (HL): practice question 9 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
- 10.
- The equilibrium law (HL): practice question 10 for Equilibrium?
A.Option A
B.Option B
C.Option C
D.Option D
Download the worksheet for Equilibrium - The equilibrium law (HL) to practice offline. It includes additional chapter-level practice questions.