Equilibrium

Which of the following statements is CORRECT for a reaction at an equilibrium?

• The rate of forward and reverse reactions are equal.

• The final concentrations of product and reactant are equal.

• The initial concentrations of product and reactant are equal.

• The rate constant of the forward and reverse reactions are equal.

Tags

NGSS.HS-PS1-6

For the graph, choose the CORRECT statement.

• The rate of reaction slowly increase

• The systems never reach equilibrium

• At equilibrium, more NO₂ is present than N₂O₄.

• At start of reaction, only NO₂ was present.

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

For the reaction, choose the CORRECT equilibrium constant, K_c.

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Tags

NGSS.HS-PS1-6

From the reaction, choose the CORRECT equilibrium constant, K_p.

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Tags

NGSS.HS-PS1-6

At elevated temperatures ammonium carbonate, NH₂COONH₄, is in equilibrium with NH₃ and CO₂ according to the equation;

NH₂COONH₄(s) ↔ 2 NH₃(g) + CO₂(g)

What is the equilibrium expression for this reaction?

• K = 2 [NH₃][CO₂]

  [NH₂COONH₄]

• K = [NH₃]²[CO₂]

  [NH₂COONH₄]

• K = 2 [NH₃][CO₂]

• K = [NH₃]²[CO₂]

Changes in pressure will only affect substances that are in the __________ state.

• gaseous
• liquid
• solid
• plasma

What is the equilibrium-constant expression for 
CO₂(g) + H₂(g) ↔ CO(g) + H₂O(l)

• K_c= [CO][H₂O] / [CO₂][H₂]  
• K_c= [CO₂][H₂] / [CO]
• K_c= [CO₂][H₂] / [CO][H₂O]
• K_c= [CO] / [CO₂][H₂]  

Tags

NGSS.HS-PS1-6

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Tags

NGSS.HS-PS1-6

Which of the following is true for a chemical reaction at equilibrium?

• Only the forward reaction stops

• Both the forward and reverse reactions stop

• The reaction quotient value is equal to equilibrium constant

• The rate constants for the forward and reverse reactions are equal

Tags

NGSS.HS-PS1-6

Which of the following are equal for a chemical system at equilibrium?

• The concentrations of reactant and products are equal

• The rate constants for the forward and reverse reactions are equal

• The time that a particular atom or molecule spends as a reactant and product are equal

• The rate of the forward and reverse reaction as the equilibrium has achieved

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6