Fertilisers Flashcards
Name the 3 essential elements required by plants
Nitrogen
Phosphorus
Potassium
What are fertilisers
Chemicals that replace
nutrients in the soil
Name 2 substances that can be used to make soluble nitrogen containing slts for fertilisers
Ammonia and nitric acid
Describe the smell, colour and solubility of ammonia
Pungent, colourless and very soluble
gas
Write the general equation for ammonia reacting with an acid
Ammonia + acid -> Ammonium salt + water
Write a word equation for ammonia reacting with nitric acid
Ammonia + nitric acid ->ammonium nitrate + water
What is the Haber process used for
To mass produce ammonia (NH3)
What are the reactants in the Haber process
N2 H2
Write a balanced formula equation to show what happens in the Haber Process
N2 + 3H2 >< 2NH3
What catalyst is used in the Haber process?
Iron
Why is the Haber process carried out at a moderate temperature
To increase the speed of production
What happens to the unreacted gases in the Haber process
They get recycled back into the process
Ammonia is the starting material to produce which substance
Nitric acid
What reactants are required in the Ostwald process
NH3+ N2 + H20
ammonia
nitrogen
water
What catalyst is used in the Ostwald process
Platinum
