Equilibrium Expressions

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

Tags

NGSS.HS-PS1-7

The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science. CO_2(g) + H₂O_(l) —> H₂CO3(aq)

Which one of the following is the correct equilibrium constant expression (Kc) for this reaction?

• Kc= 1/ [H₂CO₃]

• Kc= [CO₂]/ [H₂CO₃]

• Kc= [H₂CO₃] / [CO₂]

• Kc= [CO₂] [H₂O] / [H₂CO₃]

• Kc= [H₂CO₃] / [CO₂] [H₂O]

What is the K_eq expression for this reaction?

• K_c = [NO₂]² / [NO]² [O₂]

• K_c = [NO]² [O₂] / [NO₂]²

• K_c = [NO]² [O₂] [NO₂]²

• K_c = [NO₂]² / [NO]² + [O₂]

Tags

NGSS.HS-PS1-7

The following reaction : SO_{2 (g)} + NO_{2 (g)} ⇌ SO_{3 (g)} + NO (g) established equilibrium and was found to contain 0.40 M SO₃ , 0.30 M NO, 0.15 M NO₂ , and 0.20 M SO₂. Calculate the equilibrium constant for this reaction.

• 4.0

• .42

• .25

• 1.0

Tags

NGSS.HS-PS1-7

TRUE or FALSE:

"At equilibrium, the CONCENTRATIONS of products STAY the SAME"

• True

• False

Tags

NGSS.HS-PS1-6

Which of the following statements correctly describes any chemical reaction that has reached equilibrium?

• The reaction is now irreversible.

• The rates of the forward and reverse reactions are equal.

• Both forward and reverse reactions have halted.

• The concentrations of products and reactants are equal.

TRUE or FALSE:

"At equilibrium, the CONCENTRATIONS of reactants and products are EQUAL"

• True

• False

Tags

NGSS.HS-PS1-6

Which is the correct equilibrium constant expression for the following reaction? Fe₂O_3(s) + H_2(g) —> Fe_(s) + H₂O_(g)

• K = [H₂O]3 / [H₂]³

• K = [Fe₂O₃] [H₂]³ / [Fe]²[H₂O]³

• K = [Fe]²[H₂O]³ / [Fe_2O₃] [H₂]³

• K= [Fe] [H₂O] / [Fe₂O₃] [H₂]

• K = [H₂O] / [H₂]

When the forward and reverse reactions are occurring at the same rate, the reaction is said to be at:

• Chemical equilibrium

• Chemical reaction

• Chemical constant

• Chemical peace

Tags

NGSS.HS-PS1-6

TRUE or FALSE:

"At equilibrium, the RATES of the forward and reverse reactions are EQUAL"

• True

• False