(a(i))[1]
Nitrogen for this process is obtained from air. State the percentage by volume of nitrogen present in clean, dry air.
(a(ii))[1]
State one source of hydrogen used in the Haber process.
(b(i))[2]
Explain, using bond breaking and bond making, why this reaction is exothermic.
(b(ii))[1]
The transfer of thermal energy during a chemical reaction is known as the enthalpy change. Write the symbol used for an enthalpy change. Include the sign for an exothermic enthalpy change.
(c(i))[1]
Name the salt that is made when aqueous ammonia reacts with dilute nitric acid.
(c(ii))[1]
Name the experimental method used to prepare a solution of this salt from dilute nitric acid and aqueous ammonia.