10.4.1 The Haber process Used to manufacture ammonia to produce nitrogen-based fertilisers Equation Nitrogen + hydrogen ⇌ ammonia N2 (g) + 3H2 (g) ⇌ 2NH3 (g) Purified gases passed over… (conditions) Iron catalyst High temp - 450°C High pressure - 200atm Explain why...
10.3.1 Corrosion and its prevention Corrosion Destruction of materials by chemical reactions with substances in the environment Eg rusting 4Fe + 3O2+ 6H2O → 4Fe(OH)3 How to prevent corrosion? Surface coating Sacrificial protection Apply a coating – acts as barrier Eg...
10.2.1 Life cycle assessment (LCAs) Life cycle assessments (LCAs) are carried out to assess the environmental impact of products in each of these stages: Extracting and processing raw materials Manufacturing and packaging Use and operation during its lifetime Disposal...
10.1.1 Using the Earth's resources and sustainable development Human use of Earth’s resources – provide warmth, shelter, food & transport Natural resources, supplemented by agriculture – provide food, timber, clothing & fuels Finite resources, ocean,...