Reversible Reactions and Equilibrium

The equilibrium constant expression for the reaction BrF_5(g) —> Br_2(g) + F_2(g) is

• Kc = [Br₂] [F₂] / [BrF_5]

• Kc = [BrF₅]² / [Br₂][F₂]⁵

• Kc = [Br₂] [F₂]⁵ / [BrF₅]²

• Kc = 2[BrF₅]² / ([Br₂] × 5[F₂]⁵)

• Kc = [Br₂] [F₂]² / [BrF₅]⁵

Around what time does the reaction reach equilibrium?

• 25 min

• 70 min

• 45 min

• 80 min

Tags

NGSS.HS-PS1-6

The following factors affect the position of equilibrium EXCEPT

• Concentration

• State of Matter

• Temperature

• Pressure

What states of matter are omitted when writing K_eq expressions?

• solids and liquids

• aqueous solutions and gas

• solids, liquids, aqueous solutions and gases

• aqueous solutions & liquids

When K_eq < 1,

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

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

• The amount of reactants is equal to the amount of products.

Calculate [H₂O] if K_eq = 1.2,

[CO₂] = 0.846M, and [CH₄]= 0.0713M

4CuO_(s) +CH_4(g) ⇌ CO_2(g)+4Cu_(s) +2H₂O_(g)

• 0.101 M

• 0.318 M

• 0.0102 M

• 3.77 M

What is the relationship between the forward rate of reaction and the reverse rate of reaction in a reversible reaction at equilibrium?

• forward is greater

• reverse is greater

• the two are equal

• can not determine unless you know the rate law and k.

This symbol indicates that a reaction is ____________

• reversible

• irreversible

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

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.