Combined Science: Synergy 8465: Guiding Spaceship Earth Towards a Sustainable Future Topical Past Paper Questions

Figure 3 shows how the National Grid links a nuclear power station to consumers. Figure 3 1 Explain why step-up transformers are used in the National Grid. [4 marks] 2 Explain why step-down transformers are used in the National Grid. 2) Explain why step-down transformers are used…

This question is about metal extraction. Copper compounds can be extracted from low-grade copper ores using: • plants bacteria. 1 Name the process that uses plants to extract copper compounds from low-grade copper ores. [1 mark] 2 Name the process that uses bacteria to extract co…

This question is about life cycle assessments (LCAs). Shopping bags can be made from paper or plastic. Table 1 gives some information from LCAs about the environmental impact of paper bags and plastic bags. Each type of bag can carry the same volume of shopping. Table 1 Evaluate…