Haber Process Flashcards
What needs to happen for two molecules to react with each other?
Collide with enough energy to react.
Temp. of reaction rose from 20-25C. What type of reaction is it?
Exothermic
What is meant by BENDOMEX?
Bendo-endothermic needs more energy to break bonds than released when making them.
Mex-exothermic needs more energy to make bonds that released when breaking them.
Give an example of endothermic reaction.
Photosynthesis
What does = with arrows on mean?
Reversible reaction.
How can you tell in a graph when the reaction was the fastest?
Steepest line
What is an enzyme?
Biological catalyst
What is made in the Haber process?
Ammonia
What do we call the minimum energy molecules need to have in order to react?
Activation energy
When does the reaction finish on a graph?
When it first reaches the top and makes a straight line.
What is the equation for the Haber process?
N2+3H2=2NH3
Explain why increasing surface area of a solid increases the rate of reaction.
There is a higher chance of collisions.
What pressure do we choose for Haber process and why?
250atm because a high pressure increases rate and yield.
What temperature do we choose for the Haber process and why?
400C, medium temperature because high temp increases rate of reaction but decreases yield.
Where does the Nitrogen come from in the Haber process?
Air
Give an example of an exothermic reaction.
Displacement
Neutralisation
Combustion
Where does the hydrogen come from for the Haber process.
Natural gas
How could I prove a reaction is exothermic?
Measure temperature
React
Measure again
If temp has risen it is an exothermic reaction
How do you find out loss of mass in first 100s?
Go up to the line at 100s then across.
Diagram for endothermic reaction?
Reactants lower than products. Energy on the side.
How would you sketch a line on a graph to show what happens with a higher temp?
Steeper but reaches the same maximum.
Why does increasing pressure increase rate of reaction?
There is more energy so particles move faster so there are more collisions.
Why does adding a catalyst increase the rate of reaction?
Lowers activation energy so there are more successful collisions.
What catalyst do we use for Haber process and why?
Iron because it increases rate without having an effect on the yield.
