Energy and Reactions Flashcards
Give an example of a exothermic reaction?
Respiration.
What is the difference between a exothermic reaction and a endothermic reaction?
An endothermic reaction takes in energy and an exothermic reaction gives out energy
Give two examples of endothermic reactions?
Thermal decomposition.
Photosynthesis.
How does the volume of the products in the Haber process compare to the volume of the reactants?
The volume of the reactants is much greater than the volume of the products.
How can we get the maximum yield of ammonia?
Make the pressure as high as possible.
What is wrong with a really high pressure during the Haber process?
Because pipes which can withstand the high-pressure are expensive and explosions are also a risk.
What needs to happen in the Haber process in terms of pressure?
We have to make a compromise between using very high pressures we could produce a draft of ammonia and the expense of building a chemical plant which can withstand those high pressures.
In the Haber process, why is the effect on temperature more complicated than the effects on pressure?
Because the forward reaction is exothermic so carrying out at a low temperature will increase the amount of ammonia in the reaction however at a low temperature the reaction would be very slow because the particles would collide less often I would have less energy and we need to make it as fast as possible to you don’t have to wait for it to be produced.
What comprise do you have to make regarding temperature in the Haber process?
We need to have a reasonably high temperature so the reaction is a reasonable rate even that reduces the amount of ammonia. We also need to use an iron catalyst in the reaction.
