6.3. Reversible reactions and equilibrium
A subsection of Chemistry, 0620, through 6. Chemical reactions
Listing 10 of 390 questions
Ammonia is an important chemical. Ammonia is manufactured by the Haber process. The reaction is reversible. What is the sign for a reversible reaction? State the essential conditions for the manufacture of ammonia by the Haber process starting from hydrogen and nitrogen. Include a chemical equation to show the reaction which occurs. Name one raw material which is a source of the hydrogen used in the Haber process. Ammonia is a base and reacts with sulfuricacid to form the salt, ammoniumsulfate. What is meant by the term base? Name the industrial process used to manufacture sulfuricacid. Write a chemical equation for the reaction between ammonia and sulfuricacid. When aqueous ammonia is added to aqueous iron(sulfate a green precipitate is seen. This green precipitate turns red-brown at the surface. Name the green precipitate. Suggest why the green precipitate turns red-brown at the surface. State what happens when an excess of aqueousammonia is added to the green precipitate. Ammonia reacts with oxygen as shown. 4NH3+ 5O24NO+ 6H2OCalculate the volume of oxygen at room temperature and pressure, in dm3, that reacts with 4.80 dm3 of ammonia.  volume = dm3 The chemical equation for the reaction can be represented as shown. H N H H + O O H O H + N O Use the bond energies in the table to calculate the energy change, in kJ / mol, which occurs when one mole of NH3 reacts. bond N–H O=O N=O O–H bond energy in kJ / mol ● ● Energy needed to break bonds.  kJ ● ● Energy released when bonds are formed.  kJ ● ● Energy change when one mole of NH3 reacts.  energy change = kJ / mol  
0620_w19_qp_42
THEORY
2019
Paper 4, Variant 2
View
Questions Discovered
390