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Equilibria
Test Description: Questions about Le'Chatelier's Principle.
Instructions: Answer all questions to get your test result.
1) The value of the equilibrium constant, K, does NOT depend on
A
the concentration of the reactants
B
the nature of the reactants
C
the nature of the products
D
the temperature of the system
2) In an equilibrium with K = 4.6 x 10^9 L/mol,
A
the concentration of reactants is about the same as the concentration of products
B
the concentration of reactants is much smaller than the concentration of products
C
the concentration of reactants is much larger than the concentration of products
D
You can't tell from the information given
3) If the concentration of product were to double, the equilibrium constant would
A
not change
B
become half its current value
C
double its value
D
quadruple its value
4) Consider the formation of ammonia gas from nitrogen and hydrogen, which is endothermic. Which change would shift the equilibrium to the right?
A
increasing the temperature
B
adding some NH3
C
decreasing the temperature
D
removing some N2
5) Consider the equilibrium in which 2 moles of HI gas are formed from 1 mole of H2 gas and 1 mole of solid iodine. Which change would shift the equilibrium to the left?
A
decreasing the pressure
B
increasing the pressure
C
removing solid iodine
D
adding solid iodine
6) At equilibrium,
A
the concentration of reactants is 0
B
the rate of the backward reaction is 0
C
the rate of the forward reaction is 0
D
the change in concentration of reactants is 0
7) When heat is added to an exothermic system at equilibrium,
A
the reaction goes to completion
B
the equilibrium shifts towards products
C
the equilibrium does not change
D
the equilibrium shifts towards reactants
8) Which of the following is an example of a system in equilibrium?
A
Water evaporating from an open water bottle
B
Water evaporating and condensing within a closed water bottle
C
None of these is a system in equilibrium
D
The reaction of hydrogen gas and oxygen gas to form water in a rocket plume
9) Which of the following is an example of a system in equilibrium?
A
The formation of carbonic acid in the ocean
B
The condensation of water on the outside of a cold glass
C
None of these is a system in equilibrium
D
The reaction of hydrochloric acid with minerals to test the mineral content
10) Which state of matter is written in the expression for an equilibrium constant?
A
gas
B
solid
C
none of these states is written in the equilibrium expression
D
liquid
*select an answer for all questions
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