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
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