Multiple Choice
What is meant by the term “dynamic equilibrium”?
16. Chemical Equilibrium
Intro to Chemical Equilibrium
Back16. Chemical Equilibrium
Intro to Chemical Equilibrium
- Multiple ChoiceWhich of the following statements about the equilibrium constant is false?
- Multiple ChoiceWrite the equilibrium constant expression for the following reaction:
CH4 (g) + 2 H2S (g) ⇆ CS2 (g) + 4 H2 (g)
- Multiple ChoiceA small K (K << 0) would indicate:
- Multiple ChoiceWhich of the following is true about the role of solids and liquids in equilibrium processes?
- Multiple Choice
Methane (CH4) reacts with hydrogen sulfide to yield hydrogen gas and carbon disulfide, a solvent used in the manufacturing rayon and cellophane. What is the value of Kc at 1000 K if the partial pressures in an equilibrium mixture at 1000 K are 0.20 atm methane, 0.15 atm hydrogen sulfide, 0.30 atm carbon disulfide and 0.10 atm hydrogen gas?
CH4 (g) + 2 H2S (g) ⇌ 4 H2 (g) + CS2 (g)
- Multiple Choice
Which of the following does not represent a heterogenous equilibrium?
I) CH4(g) + 2 O2(g) ⇌ CO2(g) + 2 H2O(g)
II) CO2(g) + C(s) ⇌ 2 CO(g)
III) 2 H2O(l) ⇌ 2 H2(g) + O2(g)
IV) CH3COOH(aq) + H2O(l) ⇌ CH3COO–(aq) + H3O+(aq) - Open Question
Which statement correctly describes a reaction in dynamic equilibrium? At dynamic equilibrium, the reactions stop and the amounts of reactants and products do not change. At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change. At dynamic equilibrium, the reactions stop but the amounts of reactants and products are changing. At dynamic equilibrium, the reactions continue and the amounts of reactants and products are changing.
- Multiple ChoiceA chemical system is said to have reached the state of equilibrium when:
- Multiple ChoiceWhich statement best describes the condition of a chemical system at equilibrium?
- Multiple ChoiceConsider the following reaction: CO(g) + 2H2(g) ⇌ CH3OH(g). The reaction between CO and H2 is carried out at a specific temperature with initial concentrations of CO = 0.31 M and H2 = 0.55 M. At equilibrium, the concentration of CH3OH is found to be 0.10 M. What is the equilibrium concentration of CO?
- Multiple ChoiceConsider the reaction A(aq) ⇌ B(aq) in an equilibrium state where KC < 1. The rate of the reaction A(aq) → B(aq) at equilibrium is 59.9 mol/s. What is the rate of the reaction B(aq) → A(aq) at equilibrium?
- Multiple ChoiceConsider the reaction A(aq) ⇌ B(aq) in an equilibrium state where K_C < 1. If the rate of the forward reaction A(aq) ⇌ B(aq) at equilibrium is 59.9 mol/s, what is the rate of the reverse reaction B(aq) ⇌ A(aq) at equilibrium?
- Multiple ChoiceCyclohexane, C6H12, undergoes a molecular rearrangement in the presence of AlCl3 to form methylcyclopentane, CH3C5H9, according to the equation: C6H12 ⇌ CH3C5H9. If Kc = 0.143 at 25°C for this reaction, what is the equilibrium concentration ratio of CH3C5H9 to C6H12?
- Multiple ChoiceFor the isomerization reaction butane ↔ isobutane, Kp equals 25 at 500°C. If the initial pressures of butane and isobutane are 10.0 atm and 0.0 atm, respectively, what are the pressures of the two gases at equilibrium?