Dynamic Equilibrium

At equilibrium, __________.

• all chemical reactions have ceased

• the rates of the forward and reverse reactions are equal

• the rate constants of the forward and reverse reactions are equal

• the value of the equilibrium constant is 1

• ) the limiting reagent has been consumed

When the system A + B C + D is at dynamic equilibrium

• the sum of the concentrations of A and B must equal the sum of the concentrations of C and D.

• ,the forward reaction has stopped.

• both the forward and the reverse reactions have stopped.

• the reverse reaction has stopped

• neither the forward nor the reverse reaction has stopped.

This symbol indicates that a reaction is ___________

• reversible

• irreversible

Tags

NGSS.HS-PS1-6

2A + 3B <----> 2AB

The forward reaction forms the substance __________.

• A

• AB

• B

• A + B

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]

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

What is the equilibrium-constant expression for

CO₂(g) + H₂(g) ↔ CO(g) + H₂O(g)

• K_c= [CO][H₂O] / [CO₂][H₂]

• K_c= [CO][H₂O] / [CO₂][H₂]

• K_c= [CO₂][H₂] / [CO]

• K_c= [CO] / [CO₂][H₂]

Tags

NGSS.HS-PS1-7

Given the following equilibrium constants, Which of the following will produce the greatest amount of product.

• 6.2 x 10^-10 M

• 2.5 x 10^-5 M

• 1.1x10⁵ M

• 1.2x 1¹ M

Tags

NGSS.HS-PS1-5

Which of the following statements is true about dynamic equilibrium in chemical reactions.

• A large K value produces a reverse reaction

• a large K value produces more products than reactants.

• A small K value produces a greater amount of product.

• A small K value forces a forward reaction

An equilibrium constant with a value of 4.6 x10¹⁵ indicates that at equilibrium

• the reactants are favored.

• the products are favored.

• approximately equal concentrations of reactants and products are present.

Which of the following is TRUE of a system for which K << 1?

• t will take a long time to reach equilibrium

• he equilibrium favors the reverse reaction.

• It will take a short time to reach equilibrium.

• The equilibrium favors the forward reaction.