Ch 18 Chemical Equilibrium

Around what time does the reaction reach equilibrium?

• 25 min

• 70 min

• 45 min

• 80 min

What are the two factors that help determine that equilibrium is reached?

• Forward reaction rate is faster than the reverse and the concentrations are equal

• Forward and reverse reaction rates are equal and concentrations are equal

• Forward and reverse reaction rates are equal and concentrations are constant

Tags

NGSS.HS-PS1-6

Which of the two graphs reaches equilibrium?

• Neither

• The left

• Both

• The right

Which of the following is NOT true at equilibrium?

• The concentrations of reactants and products do not change.

• The forward and reverse reactions proceed at the same rate.

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

• The forward and reverse reactions continue to occur.

The following factors affect the position of equilibrium EXCEPT

• Concentration

• State of Matter

• Temperature

• Pressure

Tags

NGSS.HS-PS1-5

Consider the following equilibrium:

2NO_{2(g) <->} N₂O_4(g)

A 1.00 L flask contains 0.030 mol NO₂ and 0.040 mol N₂O₄ at equilibrium.

The value of K_eq is

• 0.023

• 0.67

• 1.3

• 44

Consider the following reaction:

2Hg_(g) + O_2(g) <-> 2HgO_(s)

The equilibrium constant expression for the reaction is

• A

• B

• C

• D

Which of the following is the correct K_p expression for the reaction?

• [NH₄Cl]/([NH₃][HCl])

• P_NH4Cl / (P_NH3)(P_HCl)

• 1 / (P_NH3)(P_HCl)

• (P_NH3)(P_HCl)

Tags

NGSS.HS-PS1-6

What kind of equilibrium does the reaction below show?

H_2(g) +I_2(g) ↔ 2HI_(g)

• Heterogeneous equilibrium, all the reactants and products are in the same physical state.

• Homogeneous equilibrium, all the reactants and products are in the same physical state.

• Heterogeneous equilibrium, the reactants and products are present in more than one physical state

• Homogeneous equilibrium, the reactants and products are present in more than one physical state

An equilibrium constant with a large magnitude indicates…

• A very fast reaction
• Higher concentration of products at equilibrium
• Higher concentration of reactants at equilibrium
• Nothing, without considering the stoichiometry of the reaction