The reaction between nitrogen and hydrogen to form ammonia is reversible.
The reaction mixture can reach a dynamic equilibrium.
Which of these statements describes what is happening at equilibrium?
Put ticks (✓) in the boxes next to the two correct statements.
The concentrations of nitrogen, hydrogen and ammonia are constant
The forward and reverse reactions happen at the same time
All of the nitrogen and hydrogen react to make ammonia.
Economic considerations
to be economically viable need to make as _________ ammonia as possible as ____________ as possible and the conditions are a ______________________ between these two factors.
Question 3
3.
Temperature.
Higher temperature shifts equilibrium to _________ as the reverse reaction is ________________ so the higher the temperature the __________the yield.
At lower temperature the rate of reaction is too _________
so a _______________ medium temperature of about 450°C is used
Other Answer Choices:
lower
left
endothermic
right
slow
compromise
exothermic
Question 4
4.
Note the Edexcel specification pressure is 200 Atm
Pressure
higher pressure shifts equilibrium to __________ the side with __________ (LHS 4 gas moles vs RHS 2 gas moles).
The higher the pressure the ___________ the yield because forward reaction decreases _____________
higher the pressure the tougher the reaction vessel has to be so that it does not burst
higher pressure increases _________ .
_______________ medium pressure of ________ atmospheres
Other Answer Choices:
right
fewer
higher
cost
200
compromise
pressure
Question 5
5.
Note the Edexcel specification pressure is 200 Atm
Catalyst
catalyst gives more product in same _________
catalyst allows use of __________ temperature for same rate
catalyst does not change ________________ position
(Note a catalyst provides an ________________ reaction pathway of lower _______________ energy so a greater proportion of the particles ___________ the activation energy so the frequency of _______________ collisions increases even though the total number of collisions is not changed).
Other Answer Choices:
activation
time
equilibrium
alternative
lower
successful
exceed
The reaction between nitrogen and hydrogen has stopped.
The concentration of ammonia is increasing.
The forward and reverse reactions happen at the same rate.