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Equilibrium/LeChatelier's Principle
Test Description: Equilibrium and LeChatelier's Principle
Instructions: Answer all questions to get your test result.
1) What is a property of a reaction that has reached equilibrium?
A
The amount of products is equal to the amount of reactants
B
The amount of products is greater than the amount of reactants
C
The rate of the forward reaction is equal to the rate of the reverse reaction
D
The rate of the forward reaction if greater than the rate of the reverse reaction
2) Given the reaction at equilibrium: 2CO(g) + O2(g) <-> 2CO2(g) When the reaction is subjected to stress, a change will occur in the concentration of
A
both reactants and products
B
products, only
C
neither reactants nor products
D
reactants, only
3) In which reaction will the point of equilibrium shift to the left when the pressure on the system is increased?
A
CaCO3(s) <-> CaO(s) + CO2(g)
B
2H2(g) + O2(g) <-> 2H2O(g)
C
C(s) + O2(g) <-> CO2(g)
D
2Mg(s) + O2(g) <-> 2MgO(s)
4) Given the reaction at equilibrium: 2 SO2(g) + O2(g) <-> 2 SO3(g) + heat. Which change will shift the equilibrium to the right?
A
decreasing the pressure
B
increasing the temperature
C
adding a catalyst
D
adding more O2(g)
5) Given the reaction A2(g) + B2(g) <--> 2AB(g) + heat. An increase in the concentration of A2(g) will
A
increase the production of B2(g)
B
increase the frequency of collisions between A2(g) and B2(g)
C
decrease the frequency of collisions between A2(g) and B2(g)
D
decrease the production of AB(g)
6) Given the reaction at equilibrium: N2(g) + 3 H2(g) <--> 2 NH3 (g). If the pressure is increased at constant temperature, there will be an increase in the number of moles of
A
H2(g), only
B
NH3 (g), only
C
both N2(g) and H2(g)
D
N2(g), only
7) Given the equilibrium reaction in a closed system: H2(g) + I2(g) + heat <--> 2 HI(g). What will be the result of an increase in temperature?
A
The equilibrium will shift to the right and [HI] will increase
B
The equilibrium will shift to the left and [H2] will increase
C
The equilibrium will shift to the right and [HI] will decrease
D
The equilibrium will shift to the left and [H2] will decrease
8) AgCl(s) + heat <--> Ag+(aq) + Cl-(aq). Which change will cause an increase in the amount of AgCl(s)?
A
a decrease in pressure
B
an increase in the concentration of Cl-(aq)
C
an increase in temperature
D
a decrease in the concentration of Ag+(aq)
9) Given the reaction at equilibrium: 1/2 N2(g) +1/2 O2(g) + 21.6 kJ <--> NO(g). The equilibrium will shift to the right if the
A
pressure decreases
B
temperature decreases
C
pressure increases
D
temperature increases
10) A reaction will be spontaneous if it results in products that have
A
lower potential energy and more randomness
B
greater potential energy and less randomness
C
greater potential energy and more randomness
D
lower potential energy and less randomness
*select an answer for all questions
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