Q.1
PCl3 (g) + Cl2 (g) ↔ PCl5 (g) + energyWhich of the following causes an increase in the moles of PCl5 present at equilibrium shown?
  • decreasing the volume of the container
  • raising the temperature
  • adding a mole of He gas at constant volume
  • adding a mole of He gas at constant pressure
Q.2
2SO2(g)+O2(g)⇌2SO3(g)Decreasing volume of container will
  • shift equilibrium right
  • shift equilibrium left
  • change K
  • have no change
Q.3
At elevated temperatures ammonium carbonate, NH2COONHis in equilibrium with NH3 and CO2 according to the equation;NH2COONH4(s) ↔ 2 NH3(g) + CO2(g)What is the equilibrium expression for this reaction?
  • K = 2 [NH3][CO2] [NH2COONH4]
  • K = [NH3]2[CO2] [NH2COONH4]
  • K = 2 [NH3][CO2]
  • K = [NH3]2[CO2]
Q.4
How do catalysts increase the rate of reaction?
  • The frequency of collisions is the increased
  • the activation energy is lowered
  • the energy of collisions is increased
  • Both the frequency and energy of collisions is increased
Q.5
What is the Keq expression for this reaction? 2 NO(g) + O2(g) ⇌ 2 NO2(g)
  • Keq = [NO2]2 / [NO]2 [O2]
  • Keq = [NO]2 [O2] / [NO2]2
  • Keq = [NO]2 [O2] [NO2]2
  • Keq = [NO2]2 / [NO]2 + [O2]
Q.6
What is the molarity of 1 mole of Ba+ in 2 L of water
  • 1 M
  • 2 M
  • .5 M
  • .25 M
Q.7
What is the molarity of 3 mole of hydrochloric acid in 3 L of water.
  • 3
  • 1
  • 6
  • 9
Q.8
What is the molarity of a solution which contains 22.grams of NaCl in 50.0 mL of solution?
  • 0.488 M
  • 7.67 mol
  • 7.67 M
  • 0.00767 M
Q.9
During the reaction P4 + 5O2 → P4O0.mole of product was made in 15.0 seconds. What is the rate of reaction?
  • 56.8 g/min
  • 908 g/min
Q.10
What makes an effective collision?
  • When molecules collide.
  • When molecules collide with the proper orientation.
  • When molecules collide with proper orientation and enough kinetic energy.
  • High Temperature.
Q.11
If the system is shifted to the left, it means that.....
  • Q < Kc
  • Q > Kc
  • Q = Kc
Q.12
Which one is wrong for the characteristics of a system in equilibrium?
  • Rate forward more than rate reverse
  • Reaction still ongoing, but the [reactant] & [product] remain constant
  • Must take place in close system
  • Must be reversible reaction
Q.13
If the system is shifted to right, it means that.....
  • Q < Kc
  • Q > Kc
  • Q = Kc
Q.14
What will happen to the equilibrium constant if a catalyst was added to an equilibrium system?
  • Changed
  • Unchanged
Q.15
What will happen to the equilibrium constant if we change the pressure on an equilibrium system?
  • Changed
  • Unchanged
Q.16
What will happen to the equilibrium composition if we change the temperature?
  • Changed
  • Unchanged
Q.17
What will happen to the equilibrium composition if we change the pressure on an equilibrium system?
  • Changed
  • Unchanged
Q.18
What will happen to the chemical composition if a catalyst was added to the equilibrium system?
  • Changed
  • Unchanged
Q.19
Does equilibrium constant have a unit?
  • Yes
  • No
Q.20
What will happen to the equilibrium constant if we change the temperature on an equilibrium system?
  • Changed
  • Unchanged
0 h : 0 m : 1 s