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WorksheetsChemical Equilibrium (Quiz)
Total questions: 14
Worksheet time: 30mins
Which of the following is TRUE about chemical equilibrium in a reaction?
the rates of the forward and backward reactions are directly proportional
forward and reverse reaction rates become equal
reaction has stopped
the concentrations of the reactant and product species are inversely proportional
If Q = [A]m[B]n[C]x[D]y and the equation is 4NH3(g) + 7O2(g) ⇌ 4NO2(g) + 6H2O(g). What is the value of n?
7
2
3
6
Write the concentration-based reaction quotient expression for this reactions:
2N2(g) + 6H2(g) ⇌ 4NH3(g)
(a)
Which of the following phase of matters are disregarded in writing reaction quotient?
gas
aqueous
liquid
None of the choices
Which of the following is TRUE when the reaction proceeds toward equilibrium in the reverse direction?
reactant concentrations increases
product concentration increases
reaction quotient consequently increases
denominator of Qc decreases
What law states that "At a given temperature, the reaction quotient for a system at equilibrium is constant"?
Law of mass action
Law of Chemical Equilibrium
Law of Thermodynamics
Law of Motion
CHECK YOUR LEARNING.
For the reaction
4NH3(g) + 7O2(g) ⇌ 4NO2(g) + 6H2O(g)
the concentrations at equilibrium are [NH3] = 0.17 M, [O2] = 2.8 M, and [NO2] = 7.7 M, [H2O] = 0.3 M
What is the value of the equilibrium constant, Kc?
(a)
CHECK YOUR LEARNING.
For the reaction
N2(g) + 3H2(g) ⇌ 2NH3(g)
The equilibrium mixture of gases was analyzed and found to contain 1.45 atm for N2, 0.47 atm for H2, and 0.77 atm NH3.
From these data, calculate the equilibrium constant Kp for the reaction:
(a)
What does a large K at equilibrium indicate?
very little reactant has been converted
It indicates how rapidly or slowly equilibrium will be reached
most of the reactant has been converted to product
All of the above
What is the value of K when equilibrium favors the products and equilibrium lies to the right?
>1
<1
1
0
What principle states that "if a stress (changes in reaction conditions) is applied to a system in equilibrium, then the systems adjust to reduce the effect of the stress applied"?
(a)
For the reaction
4NH3(g) + 7O2(g) ⇌ 4NO2(g) + 6H2O(g)
What is the equilibrium shift if more O2 is added?
forward
backward
No shift
For the reaction
Fe3O4(s) + 4H2(g) + heat ⇌ 3Fe(s) + 4H2O(g)
What is the effect to equilibrium if temperature is decreased?
increase
decrease
No effect
in the number of
moles
For the reaction
N2(g) + 3H2(g) ⇌ 2NH3(g)
If pressure is decreased, which side of the reaction will the equilibrium favor?
Reactant
Product
No effect
