Chemical reactions are reversible and may reach a dynamic equilibrium. The position of equilibrium of a reversible reaction can be altered by changing the reaction conditions.
What is this symbol '⇌' used to represent?
A redox reaction
A reversible reaction
A physical change
What term is used to describe a chemical reaction in which the forward and reverse reaction rates are the same?
A static equilibrium
An equal equilibrium
A dynamic equilibrium
What is produced in the backward reaction in this equilibrium, when the reaction goes from right to left: NH4Cl(s) ⇌ NH3(g) + HCl(g)?
NH3(g) + HCl(g)
NH4Cl(s) + NH3(g) + HCl(g)
If the forward reaction is endothermic, what can be deduced about the reverse reaction?
It is also endothermic
There is no energy change
It is exothermic
When a reversible reaction is at equilibrium, which of these statements is true?
The concentration of products is greater than the concentration of reactants
The concentration of products remains constant over time
The concentration of products is equal to the concentration of reactants
The equation for the Haber process is: N2 + 3H2 ⇌ 2NH3.
What gases will be present at equilibrium?
Nitrogen and hydrogen
Nitrogen, hydrogen and ammonia
One of the stages in sulfuric acid production is described by this equation: 2SO2(g) + O2(g) ⇌ 2SO3(g). What will happen to the yield of SO3 if the pressure is increased? - Higher
It will go up
It will go down
It will stay the same
If the forward reaction in a reversible reaction is endothermic, what will be the effect of decreasing the temperature? - Higher
It increases the amount of product present at equilibrium
It decreases the amount of product present at equilibrium
It does not affect the equilibrium
What is the effect of decreasing the pressure on the following equilibrium 2NO(g) + O2(g) ⇌ 2NO2(g)? - Higher
Less NO2 will be produced
Less NO and O2 is formed
No change will occur
What effect on the equilibrium position is produced by adding a catalyst to a system in equilibrium? - Higher
It decreases the yield of product
It increases the yield of products
It has no effect