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WorksheetsChemical Equilibrium
Total questions: 10
Worksheet time: 9mins
Name
Class
Date
1.
Such reactions which continue in both directions are called:
a)
Irreversible reactions
b)
Reversible reactions
c)
Non-reactive reactions
d)
dynamic reactions
2.
At elevated temperatures ammonium carbonate, NH2COONH4, is 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?
a)
K = 2 [NH3][CO2]
[NH2COONH4]
b)
K = [NH3]2[CO2]
[NH2COONH4]
c)
K = 2 [NH3][CO2]
d)
K = [NH3]2[CO2]
3.
Changes in pressure will only affect substances that are in the __________ state.
a)
gaseous
b)
liquid
c)
solid
d)
plasma
4.
What is the equilibrium-constant expression for
CO2(g) + H2(g) ↔ CO(g) + H2O(l)
CO2(g) + H2(g) ↔ CO(g) + H2O(l)
a)
Kc= [CO][H2O] / [CO2][H2]
b)
Kc= [CO2][H2] / [CO]
c)
Kc= [CO2][H2] / [CO][H2O]
d)
Kc= [CO] / [CO2][H2]
5.
For the following reaction: H2(g) + Cl2 (g) ↔ 2HCl(g), calculate the concentration of HCl when Keq= 2.3x10-5, [H2]= 0.0056mol, [Cl2]= 0.0048mol.
a)
6.2 x 10-10 M
b)
2.5 x 10-5 M
c)
1.1 M
d)
1.2 M
6.
What are the two factors to look for when determining if the reaction is at equilibrium?
a)
Forward reaction rate is faster than the reverse and concentrations are equal
b)
Forward and reverse reaction rates are equal and concentration is constant
c)
Forward and revers reaction rates are equal and concentration is equal
d)
Forward reaction rate is faster than the reverse and concentration is equal
7.
This symbol indicates that a reaction is ____________
a)
reversible
b)
irreversible
8.
Which of the following is NOT true at equilibrium?
a)
The forward and reverse reactions proceed at the same rate.
b)
The concentrations of reactants and products do not change.
c)
The concentration of the reactants is equal to the concentration of the products.
d)
The forward and reverse reactions continue to occur.
9.
2A + 3B <----> 2AB
The forward reaction forms the substance __________.
The forward reaction forms the substance __________.
a)
A
b)
B
c)
AB
d)
A + B
10.
2A + 3B <----> 2AB
The reverse reaction forms the substance __________.
The reverse reaction forms the substance __________.
a)
A
b)
B
c)
AB
d)
A + B
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