Some chemical reactions can be reversed. Reversible reactions can reach a dynamic equilibrium. Changing the conditions can change the amount of product made.
What is the 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:
NH4Cl(s) ⇌ NH3(g) + HCl(g)?
NH3(g) + HCl(g)
NH4Cl(s) + NH3(g) + HCl(g)
If the forwards 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 is the effect on an equilibrium if the concentration of a product is decreased? - Higher
It increases the amount of the reactants
It moves the position of equilibrium to the right
It has no effect