Define chemical equilibrium.

The rate of a forward reaction is equal to the rate of the reverse reaction.

The concentration of the reactants is equal to the concentration of the products.

The reaction stops and no further change in concentration occurs.

Which of the following is NOT true at equilibrium?

The concentration of the reactants is equal to the concentration of the products.

The forward and reverse reactions proceed at the same rate.

The concentrations of reactants and products do not change.

The forward and reverse reactions continue to occur.

Which of the following will allow chemical equilibrium to be established?

The reactants and products are all aqueous solutions.

Gas continually bubbles out of a container.

A precipitate forms in the reaction vessel.

The reaction is not reversible.

What is the K c expression for this reaction? 2 NO (g) + O 2(g) ⇌ 2 NO 2(g)

K c = [NO 2 ] 2 / [NO] 2 [O 2 ]

K c = [NO] 2 [O 2 ] / [NO 2 ] 2

K c = [NO 2 ] 2 / [NO] 2 + [O 2 ]

Given: 2A(g) <=> 2B(g) + C(g). At a particular temperature, K c = 16000. Raising the pressure, by decreasing the volume of the container, will...

have no effect on the value of K c as temperature does not change

cause the value of K c to increase

cause the value of K c to decrease

If the equilibrium constant is much greater than one (K >> 1) then

Equilibrium lies to the right (products are favored)

Equilibrium is not established.

Equilibrium lies to the left (reactants are favored)

Neither products or reactants are favored.

The rates of reaction for both the reverse and the forward reaction of a reversible reaction are shown in the graph on the left. Which of the following statements is true when the reaction reaches an equilibrium state?

The rates of the reverse and forward reactions are equal at equilibrium.

The forward reaction rate is higher than the reverse reaction rate at equilibrium.

Both the reverse and forward reactions stop when equilibrium is reached.

The amount of product formed decreases when equilibrium is reached.

Le Chatelier's principle can be used to predict how changes in ________ affect a system in chemical equilibrium.

concentration, temperature, and pressure

concentration, temperature, particle size, and catalysts

concentration, temperature, and catalysts

Why are solids eliminated from equilibrium expressions?

Their concentrations do not change.

Their concentrations are always zero.

Their concentrations are always one.

Equilibrium Quiz

33 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

2A + 3B <----> 2AB
The forward reaction points towards the __________.

left

right

up

down

Tags

NGSS.HS-PS1-6

2.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

2A + 3B <----> 2AB
The forward reaction forms the substance __________.

A

B

AB

A + B

Tags

NGSS.HS-PS1-2

3.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

2A + 3B <----> 2AB
The reverse reaction forms the substance __________.

A

B

AB

A + B

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For the reaction...
SO₂ + O₂ <−> SO₃
If the concentration of SO₂is increased, the equilibrium of the reaction will shift ___________.

left

right

left and right

neither left nor right

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

5.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the right, the concentration of O₂ will ___________.

increase

decrease

remain the same

double

Tags

NGSS.HS-PS1-6

6.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the right, the concentration of SO₃ will ___________.

increase

decrease

remain the same

double

Tags

NGSS.HS-PS1-6

7.

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

For the reaction...
SO₂ + O₂ <−> SO₃
If the concentration of O₂is decreased, the equilibrium of the reaction will shift ___________.

left

right

left and right

neither left nor right

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-5

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Equilibrium

2A + 3B <----> 2AB
The forward reaction points towards the __________.

2A + 3B <----> 2AB
The forward reaction forms the substance __________.

2A + 3B <----> 2AB
The reverse reaction forms the substance __________.

For the reaction...
SO₂ + O₂ <−> SO₃
If the concentration of SO₂is increased, the equilibrium of the reaction will shift ___________.

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the right, the concentration of O₂ will ___________.

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the right, the concentration of SO₃ will ___________.

For the reaction...
SO₂ + O₂ <−> SO₃
If the concentration of O₂is decreased, the equilibrium of the reaction will shift ___________.

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the left, the concentration of SO₃ will ___________.

For the reaction...
heat + N₂ + O₂ <−> 2NO
If NO is removed from the system, the concentration of N₂ will _______.

For the reaction...
heat + N₂ + O₂ <−> 2NO
If the heat is added to the chemical system, the equilibrium will shift _______.

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Equilibrium

2A + 3B <----> 2ABThe forward reaction points towards the __________.

2A + 3B <----> 2ABThe forward reaction forms the substance __________.

2A + 3B <----> 2ABThe reverse reaction forms the substance __________.

For the reaction...SO2 + O2 <−> SO3If the concentration of SO2 is increased, the equilibrium of the reaction will shift ___________.

For the reaction...SO2 + O2 <−> SO3If the equilibrium shifts to the right, the concentration of O2 will ___________.

For the reaction...SO2 + O2 <−> SO3If the equilibrium shifts to the right, the concentration of SO3 will ___________.

For the reaction...SO2 + O2 <−> SO3If the concentration of O2 is decreased, the equilibrium of the reaction will shift ___________.

For the reaction...SO2 + O2 <−> SO3If the equilibrium shifts to the left, the concentration of SO3 will ___________.

For the reaction...heat + N2 + O2 <−> 2NOIf NO is removed from the system, the concentration of N2 will _______.

For the reaction...heat + N2 + O2 <−> 2NOIf the heat is added to the chemical system, the equilibrium will shift _______.

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2A + 3B <----> 2AB
The forward reaction points towards the __________.

2A + 3B <----> 2AB
The forward reaction forms the substance __________.

2A + 3B <----> 2AB
The reverse reaction forms the substance __________.

For the reaction...
SO₂ + O₂ <−> SO₃
If the concentration of SO₂is increased, the equilibrium of the reaction will shift ___________.

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the right, the concentration of O₂ will ___________.

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the right, the concentration of SO₃ will ___________.

For the reaction...
SO₂ + O₂ <−> SO₃
If the concentration of O₂is decreased, the equilibrium of the reaction will shift ___________.

For the reaction...
SO₂ + O₂ <−> SO₃If the equilibrium shifts to the left, the concentration of SO₃ will ___________.

For the reaction...
heat + N₂ + O₂ <−> 2NO
If NO is removed from the system, the concentration of N₂ will _______.

For the reaction...
heat + N₂ + O₂ <−> 2NO
If the heat is added to the chemical system, the equilibrium will shift _______.