Question 1 (matching worth 3 points)
(07.07 mc)

match the action to the effect on the equilibrium position for the reaction n2(g) + 3h2(g) ⇌ 2nh3(g).

match term definition
removing ammonia a) no effect
removing hydrogen gas b) shift to the left
adding a catalyst c) shift to the right
question 2(multiple choice worth 3 points)
(07.07 mc)

nitrogen dioxide gas is dark brown in color and remains in equilibrium with dinitrogen tetroxide gas, which is colorless.

2no2(g) ⇌ n2o4(g)

when the light brown color equilibrium mixture was moved from room temperature to a lower temperature, the mixture turned lighter brown in color. which of the following conclusions about this equilibrium mixture is true?

this reaction is endothermic because the system shifted to the left on cooling.
this reaction is endothermic because the system shifted to the right on cooling.
this reaction is exothermic because the system shifted to the left on cooling.
this reaction is exothermic because the system shifted to the right on cooling.
question 3(multiple choice worth 3 points)
(07.07 lc)

according to le châtelier's principle, how will a decrease in concentration of a reactant affect the equilibrium system?

shift it toward the products
shift it toward the reactants
shift it toward the side with higher total mole concentration
shift it toward the side with lower total mole concentration
question 4(multiple choice worth 3 points)
(07.07 mc)

what change would shift the equilibrium system to the left?

a(g) + b(s) + energy ⇌ 3c(g)

adding more of gas c to the system
heating the system
increasing the volume
removing some of gas c from the system
question 5(multiple choice worth 3 points)
(07.07 mc)

a chemical equilibrium between gaseous reactants and products is shown.

n2(g) + 3h2(g) ⇌ 2nh3(g)

how will the reaction be affected if the pressure on the system is decreased?

it will shift toward the reactant side because the reactant side has one more mole of gas than the product side.
it will shift toward the product side as there are more oxygen atoms in the gas on the product side.
it will shift toward the reactant side as there is lower pressure on the reactant side.
it will shift toward the product side as there is higher pressure on the product side.
question 6 (true/false worth 2 points)
(07.07 lc)

according to le châtelier's principle, an increase in temperature will shift the equilibrium position toward the products in an endothermic reaction.

true
false
question 7(multiple choice worth 3 points)
(07.07 mc)

what stress would shift the equilibrium position of the following system to the right?

n2o3(g) ⇌ no(g) + no2(g); δh is negative

decreasing the concentration of n2o3
heating the system
adding a catalyst
increasing the concentration of no