AQA GCSE Chemistry 4.10 Using resources: a complete overview

What topic 4.10 actually demands

Using resources is the applied, real-world topic that closes the course. Topic 4.10 rewards clear definitions, a sound grasp of water treatment and life cycle assessments, and balanced evaluation of sustainability. It links to chemistry of the atmosphere (carbon footprint), organic chemistry (finite fossil fuels) and chemical analysis (pure versus potable water).

This guide walks through all three dot points of the topic in specification order, then sets out the exam patterns AQA repeats. Each dot point has a matching page with practice questions; this overview ties them together.

Finite and renewable resources

Natural resources come from the Earth, sea and air; chemistry makes synthetic alternatives. A finite resource (fossil fuels, metal ores) is used up faster than it forms; a renewable resource can be replaced as fast as it is used. Sustainable development meets today's needs without harming future generations. As high-grade ores run out, phytomining (plants) and bioleaching (bacteria) extract metals from low-grade ores, avoiding traditional mining but working slowly.

Potable water and water treatment

Potable water is safe to drink but not pure, as it contains dissolved substances; pure water has only water molecules. Fresh water is filtered then sterilised (chlorine, ozone or UV). Sea water can be desalinated by distillation or reverse osmosis, both energy intensive. Waste water is treated by screening, settling and biological treatment before being returned to the environment.

Life cycle assessment and recycling

A life cycle assessment evaluates a product's environmental impact across four stages: raw materials, manufacture, use and disposal (plus transport). Some impacts are hard to measure and involve value judgements, so LCAs can be biased. Reducing, reusing and recycling conserve resources and energy, and recycling metals avoids extracting them from ore.

How topic 4.10 is examined

A typical AQA profile for this topic:

• Definitions. Finite versus renewable, potable versus pure, and sustainable development.
• Processes. Water treatment, desalination and waste water treatment, and phytomining and bioleaching.
• Evaluation. Interpreting and critiquing a life cycle assessment and discussing recycling.
• Application. Linking resource use to sustainability and the carbon footprint.

Check your knowledge

A mix of recall and explanation questions covering topic 4.10. Attempt them under timed conditions, then check against the solutions.

1. Explain the difference between a finite and a renewable resource. (2 marks)
2. Define sustainable development. (1 mark)
3. Describe how phytomining extracts a metal. (2 marks)
4. Explain the difference between potable water and pure water. (2 marks)
5. Describe the two steps used to make fresh water potable. (2 marks)
6. Name two methods used to desalinate sea water. (2 marks)
7. State the four stages of a life cycle assessment. (2 marks)
8. Explain why recycling metals saves energy. (2 marks)