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Worksheetsquiz 3 (chemical equilibrium)
Total questions: 11
Worksheet time: 18mins
2A + 3B <----> 2AB
The reverse reaction forms the substance __________.
A
B
AB
A + B
Which of the following is NOT true at equilibrium?
The forward and reverse reactions proceed at the same rate.
The concentrations of reactants and products do not change.
The concentration of the reactants is equal to the concentration of the products.
The forward and reverse reactions continue to occur.
For the reaction...
heat + N2 + O2 ↔ 2NO
If the heat is added to the chemical system, the equilibrium will shift _______.
left
right
left and right
neither left nor right
For the reaction...
H2 (g) + Cl2 (g) <−> 2HCl (g) + heat
If the temperature is cooled, the _________ reaction will be favored.
forward
reverse
forward and reverse
Le Chatelier's Principle states that:
a disturbing force must be applied to a system in order for it to reach equilibrium.
when a system at equilibrium is disturbed, a new equilibrium constant is established.
when a chemical system at equilibrium is disturbed, the system shifts in order to minimize the effect.
when a chemical system is at equilibrium it is no longer possible to alter the system.
For the reaction...
heat + N2 + O2 <−> 2NO
If NO is removed from the system, the concentration of N2 will _______.
increase
decrease
remain the same
double
The following factors affect the position of equilibrium EXCEPT
Concentration
State of Matter
Temperature
Pressure
What is the effect of increasing the pressure on the following equilibrium: 2NO(g) + O2 (g) ⇌2NO2(g)?
The yield of NO2 increases
The yield of NO2 decreases
The reaction is slower
The concentration of O2 increases.
Consider this system:
2CCl4(g) + O2(g)<->2COCl2(g) + 2Cl2(g) ΔH = -35 kJ/molrxn
Predict the effect of increasing temperature.
Speed up forward reaction.
Speed up reverse reaction.
No change.
For the reaction...
N2 (g) + 3 H2(g) ⇌ 2 NH3 (g)
If the pressure in the system is decreased, which substance(s) will increase in concentration?
N2
H2
N2 and H2
NH3
What is the equilibrium expression for:
Fe3O4(s) + 4H2(g) <=> 3Fe(s) + 4H2O(g)
Kc =
[Fe]3 [H2O]4 / [Fe3O4] [H2]4
[Fe3O4] [H2]4 / [Fe]3 [H2O]4
[H2O]4 / [H2]4
[Fe] [H2O] / [Fe3O4] [H2]
