Ch. 18 (Chemical Equilibrium)

CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g)  

This is the expression for the equilibrium constant for the reaction shown above.

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Tags

NGSS.HS-PS1-2

The hydrogen sulfide produced as a byproduct of petroleum refinement can be used to produce elemental sulfur: 

2H₂S(g) + SO₂(g) ⇌ 3S(l) + 2H₂O(g)

What is the equilibrium constant expression for this reaction?

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Tags

NGSS.HS-PS1-7

What can be determined if the ion product (Q_sp)  is compared to the solubility product constant (K_sp) ?

• equilibrium

• whether a substance will precipitate

• the law of mass action

• the volume of the solution

The value of any equilibrium constant is correct only at

• a specific volume.

• a specific pressure.

• a specific concentration.

• a specific temperature.

Tags

NGSS.HS-PS1-6

A system reaches chemical equilibrium when

• no new product is formed by the forward reaction.

• the reverse reaction no longer occurs in the system.

• the concentration of reactants in the system is equal to the concentration of products.

• the rate at which the forward reaction occurs equals the rate of the reverse reaction.

Tags

NGSS.HS-PS1-6

What does a value of K_eq greater than 1 mean?

• more reactants than products exist at equilibrium

• more products than reactants exist at equilibrium

• the rate of the forward reaction is high at equilibrium

• the rate of the reverse reaction is high at equilibrium

Tags

NGSS.HS-PS1-6

What might cause the solubility of a substance to decrease?

• a decrease in temperature

• a decrease in pressure

• the presence of a common ion

• all the choices are correct.

Use the following reaction to answer the following questions.

Reaction: N₂(g) + 3H₂(g) ⇌  2NH₃(g)

Which way will the equilibrium shift when the concentration of NH₃ is increased?

• The equilibrium shifts to the left.

• The equilibrium shifts to the right.

• The equilibrium does not change.

• The equilibrium constant changes.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

Use the following reaction to answer the following questions.

Reaction: N₂(g) + 3H₂(g) ⇌  2NH₃(g)

What will be the result if the volume of the reaction vessel is decreased (aka increase in pressure) for the reaction above?

• The equilibrium shifts to the left.

• The equilibrium shifts to the right.

• The equilibrium does not change.

• The equilibrium constant changes.

Tags

NGSS.HS-PS1-6

Use the following reaction to answer the following questions.

Reaction: N₂(g) + 3H₂(g) ⇌  2NH₃(g)

Which way will the equilibrium shift when the concentration of H₂ is decreased?

• The equilibrium shifts to the left.

• The equilibrium shifts to the right.

• The equilibrium does not change.

• The equilibrium constant changes.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6