Equilibrium Concepts

Define chemical equilibrium.

• A reaction is reversible.
• The concentration of the reactants is equal to the concentration of the products.
• The rate of a forward reaction is equal to the rate of the reverse reaction.
• The reaction stops and no further change in concentration occurs.

Tags

NGSS.HS-PS1-6

What are [A] and [B]?

• concentration of reactants
• concentration of products
• energy of reactants
• energy of products

Tags

NGSS.HS-PS1-5

When calculating Keq equilibrium constants, you do not include the concentration of liquids or solids.

• True

• False

When Keq < 1,

• There are more products than reactants when the reaction reaches equilibrium.

• There are more reactants than products when the reaction reaches equilibrium.

• The amount of reactants is equal to the amount of products when the reaction reaches equilibrium

• The reaction has come to completion

When K_eq > 1,

• There are more products than reactants when the reaction reaches equilibrium.

• There are more reactant than products when the reaction reaches equilibrium.

• The amount of reactants is equal to the amount of products when the reaction reaches equilibrium.

• The reaction has come to completion

For an equilibrium reaction that has a Keq value of 1x10^-8 the

• reactants are favored

• products are favored

• reaction is endothermic

• reaction is exothermic

• reactants = products

Which is the reactant - and why?

• A, as concentration decreases

• B, as concentration decreases

• A, as concentration increases

• B, as concentration increases

Tags

NGSS.HS-PS1-5

At what time does the reaction reach Equilibrium?

• At time = 0 seconds

• At time = 20 seconds

• At time = 40 seconds

• At time = 60 seconds

• At time = 80 seconds

Which of the two graphs shows a reaction that eventually reaches equilibrium?

• The left one.

• The right one.

• Both of them.

• Neither.

Tags

NGSS.HS-PS1-6

At what time does the reaction reach equilibrium?

• t₁

• t₂

• t₃

• t₄