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 occurring 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)?
NH4Cl(s)
NH3(g) + HCl(g)
NH4Cl(s) + NH3(g) + HCl(g)
What is the balanced equation for the reaction which occurs when ammonia is made in the Haber process?
N2 + H2 ⇌ NH3
N2 + H2 ⇌ 2NH
N2 + 3H2 ⇌ 2NH3
What is the main source of the nitrogen used in the manufacture of ammonia?
Coal
Air
Natural gas
What conditions of temperature and pressure are used in the industrial manufacture of ammonia?
Temperature = 450 °C, pressure = 200 atmospheres
Temperature = 20 °C, pressure = 450 atmospheres
Temperature = 200 °C, pressure = 1 atmosphere
One of the stages in sulfuric acid production is described by this equation:
2SO2(g) + O2(g) ⇌ 2SO3(g). - Higher
What will happen to the yield of SO3 if the pressure is increased?
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 products
It increases the yield of products
It has no effect