Quiz: Equilibrium


EquilibriumOnline version iykyk by Thư Nguyễn 1 What is a chemical equilibrium? Choose one or more answers a A dynamic process where the forward and reverse reactions proceed at equal rates. b A static state where all chemical reactions completely stop. c A process where only the forward reaction continues indefinitely. d A condition where the concentrations of all substances become zero. e 2 What are the rate values of forward and reverse reactions at the equilibrium state? a They are equal. b The forward reaction rate is much higher than the reverse. c The reverse reaction rate is slightly faster than the forward. d Both reaction rates become zero. 3 How does the concentration of N₂O₄ change over time at constant temperature? (Initial [NO₂] = 0) a It decreases. b It increases steadily. c It remains constant from the beginning. d It increases first then decreases. 4 How does the concentration of NO₂ change with time at constant temperature? (Initial [NO₂] = 0) a It increases from zero. b It decreases from its initial value. c It remains zero throughout the reaction. d It increases at first but then quickly drops to zero. 5 How does the forward reaction rate vary with time at constant temperature? a It is initially high but decreases over time. b It is constant throughout the entire process. c It starts at zero and increases continuously. d It increases rapidly at first then levels off. 6 How does the reverse reaction rate vary with time at constant temperature? a It starts at zero and increases rapidly. b It is initially high and then decreases. c It remains constant and equal to the forward rate from the start. d It starts high and increases even higher. 7 Do the rates of the dissociation of N₂O₄ and dimerization of NO₂ change at the same speed? a No, they change at different speeds. b Yes, they increase and decrease at identical rates. c Yes, they both start and end at the same value simultaneously. d No, the forward rate changes faster than the reverse rate. 8 When does the system reach chemical equilibrium? a When the forward and reverse reaction rates become identical. b When the color of the gas inside the tube stops changing. c As soon as the first product molecules are formed. d When the concentrations of reactant and product become equal. 9 Is the concentration of the reactant equal to the concentration of the product at equilibrium? a No, they are not necessarily equal. b Yes, their concentrations are always equal at equilibrium. c Yes, the law of mass action requires them to be equal. d No, the product concentration is always higher. 10 What is the main idea of the text? a To explain chemical equilibrium as a dynamic process using the N₂O₄/NO₂ reaction as an example. b To prove that all chemical reactions are reversible. c To demonstrate how temperature affects the color of a gas. d To show that reactions stop when equilibrium is reached.

1

What is a chemical equilibrium?

Choose one or more answers

a

A dynamic process where the forward and reverse reactions proceed at equal rates.

b

A static state where all chemical reactions completely stop.

c

A process where only the forward reaction continues indefinitely.

d

A condition where the concentrations of all substances become zero.

e

2

What are the rate values of forward and reverse reactions at the equilibrium state?

a

They are equal.

b

The forward reaction rate is much higher than the reverse.

c

The reverse reaction rate is slightly faster than the forward.

d

Both reaction rates become zero.

3

How does the concentration of N₂O₄ change over time at constant temperature? (Initial [NO₂] = 0)

a

It decreases.

b

It increases steadily.

c

It remains constant from the beginning.

d

It increases first then decreases.

4

How does the concentration of NO₂ change with time at constant temperature? (Initial [NO₂] = 0)

a

It increases from zero.

b

It decreases from its initial value.

c

It remains zero throughout the reaction.

d

It increases at first but then quickly drops to zero.

5

How does the forward reaction rate vary with time at constant temperature?

a

It is initially high but decreases over time.

b

It is constant throughout the entire process.

c

It starts at zero and increases continuously.

d

It increases rapidly at first then levels off.

6

How does the reverse reaction rate vary with time at constant temperature?

a

It starts at zero and increases rapidly.

b

It is initially high and then decreases.

c

It remains constant and equal to the forward rate from the start.

d

It starts high and increases even higher.

7

Do the rates of the dissociation of N₂O₄ and dimerization of NO₂ change at the same speed?

a

No, they change at different speeds.

b

Yes, they increase and decrease at identical rates.

c

Yes, they both start and end at the same value simultaneously.

d

No, the forward rate changes faster than the reverse rate.

8

When does the system reach chemical equilibrium?

a

When the forward and reverse reaction rates become identical.

b

When the color of the gas inside the tube stops changing.

c

As soon as the first product molecules are formed.

d

When the concentrations of reactant and product become equal.

9

Is the concentration of the reactant equal to the concentration of the product at equilibrium?

a

No, they are not necessarily equal.

b

Yes, their concentrations are always equal at equilibrium.

c

Yes, the law of mass action requires them to be equal.

d

No, the product concentration is always higher.

10

What is the main idea of the text?

a

To explain chemical equilibrium as a dynamic process using the N₂O₄/NO₂ reaction as an example.

b

To prove that all chemical reactions are reversible.

c

To demonstrate how temperature affects the color of a gas.

d

To show that reactions stop when equilibrium is reached.

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Equilibrium

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EquilibriumOnline version

by Thư Nguyễn

What is a chemical equilibrium?

Choose one or more answers

What are the rate values of forward and reverse reactions at the equilibrium state?

How does the concentration of N₂O₄ change over time at constant temperature? (Initial [NO₂] = 0)

How does the concentration of NO₂ change with time at constant temperature? (Initial [NO₂] = 0)

How does the forward reaction rate vary with time at constant temperature?

How does the reverse reaction rate vary with time at constant temperature?

Do the rates of the dissociation of N₂O₄ and dimerization of NO₂ change at the same speed?

When does the system reach chemical equilibrium?

Is the concentration of the reactant equal to the concentration of the product at equilibrium?

What is the main idea of the text?

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