Using Resources
KS4CH-KS4-D010
The Earth's finite resources and how they are used sustainably. Covers finite and renewable resources, the sustainable use of water, the production and disposal of materials including metals, ceramics, glass and polymers, the life cycle assessment of products, and the principles of green chemistry and the circular economy.
National Curriculum context
Using resources is the most socially engaged domain of the GCSE Chemistry specification, requiring pupils to evaluate the sustainability of chemical processes and materials. The DfE subject content requires pupils to understand that the Earth's resources are finite and unevenly distributed, to explain the purification of water for potable use, and to compare the properties and uses of different materials including metals, ceramics, glass and polymers. Life cycle assessment is used as a systematic tool for evaluating the environmental impact of products from cradle to grave. Pupils are required to evaluate the social, economic and environmental trade-offs of different resource choices, including the use of recycling, bioplastics and alternative fuels. This domain integrates directly with Chemistry of the Atmosphere and provides a rich context for chemistry in everyday life.
1
Concepts
1
Clusters
3
Prerequisites
1
With difficulty levels
Lesson Clusters
Evaluate environmental impact using life cycle assessment and sustainable chemistry
practice CuratedLife cycle assessment and sustainable chemistry is the single concept in this domain; it provides the analytical tool for evaluating the environmental cost of products across their entire life span.
Teaching Suggestions (1)
Study units and activities that deliver concepts in this domain.
Atmospheric Chemistry and Climate Science
Science Enquiry Secondary Data AnalysisPedagogical rationale
Secondary data analysis is the appropriate enquiry type for atmospheric chemistry because the data is collected at global scale over decades — it cannot be replicated in a school laboratory. Analysing real scientific datasets develops critical evaluation skills: pupils must assess data quality, distinguish correlation from causation, and understand why scientific consensus is based on converging evidence from multiple independent sources. This enquiry also develops scientific literacy — the ability to evaluate claims about climate change using evidence rather than opinion.
Prerequisites
Concepts from other domains that pupils should know before this domain.
Concepts (1)
Life Cycle Assessment and Sustainable Chemistry
knowledge AI DirectCH-KS4-C014
Life cycle assessment (LCA) systematically evaluates the environmental impact of a product throughout its entire life: raw material extraction, manufacturing, use, and end-of-life disposal or recycling. LCA provides an evidence base for comparing the sustainability of different materials and processes. Sustainable chemistry (green chemistry) aims to design processes that minimise waste, use renewable feedstocks, use safer solvents and reduce energy consumption.
Teaching guidance
Compare LCAs for different products (e.g., plastic vs glass bottles, paper vs plastic bags). Pupils should understand that LCAs are useful but have limitations — they require value judgements about how to weight different types of environmental impact, and data quality varies. Connect to the Using Resources domain: recycling reduces the need for raw material extraction; bioplastics use renewable feedstocks but may compete with food production for land.
Common misconceptions
Students assume recycled materials always have lower environmental impact than virgin materials — this depends on the energy required for recycling, transport distances and other factors. Students also assume 'natural' materials are always more sustainable than synthetic ones — LCA provides the evidence for making such comparisons objectively.
Difficulty levels
Knows that recycling is good for the environment and that some resources are finite, but cannot explain the concept of a life cycle assessment or evaluate sustainability systematically.
Example task
What is meant by a 'finite resource'? Give two examples.
Model response: A finite resource is one that exists in a limited quantity and will eventually run out because it is not being replaced at the rate it is being used. Examples: crude oil (fossil fuel formed over millions of years) and iron ore (mineral deposits that cannot be renewed).
Can describe the four stages of a life cycle assessment, explain why recycling conserves resources, and describe water treatment for potable water.
Example task
Describe the four stages of a life cycle assessment for a plastic carrier bag.
Model response: 1) Raw materials: crude oil extraction and refining to produce ethene monomer. 2) Manufacturing: polymerisation of ethene to polyethene, extrusion into bag form. 3) Use: carrying shopping (typically used once). 4) Disposal: landfill (takes hundreds of years to decompose), incineration (releases CO₂ and toxic gases), or recycling (melted and reformed into new products). The LCA reveals that the single-use nature of carrier bags means most environmental impact comes from manufacturing for minimal use.
Compares the LCA of alternative products, evaluates the trade-offs in sustainability decisions, and explains the principles of green chemistry.
Example task
Compare the life cycle assessments of a paper bag and a plastic bag. Which is more sustainable?
Model response: Paper bag: raw materials from trees (renewable but requires land and water); manufacturing uses more energy and water than plastic; heavier, so greater transport emissions; biodegrades readily but recycling requires de-inking. Plastic bag: raw materials from crude oil (finite); manufacturing uses less energy and water; lighter (lower transport emissions); does not biodegrade but can be recycled if collected separately. Counter-intuitively, a paper bag must be reused at least 3-4 times to have a lower environmental impact than a single-use plastic bag (due to higher manufacturing energy). The most sustainable option is a reusable bag used many times. This illustrates why LCA is essential: intuitive judgements about sustainability are often wrong.
Critically evaluates the limitations of LCA, analyses circular economy principles, and applies sustainability thinking to novel materials and processes.
Example task
Evaluate the claim that bioplastics are more sustainable than conventional plastics. What are the limitations of this comparison?
Model response: Bioplastics are derived from renewable biological sources (corn starch, sugarcane) rather than fossil fuels, so they reduce dependence on finite resources and may have lower production emissions if the biomass absorbs CO₂ during growth. However, the sustainability comparison is complex: bioplastic crops compete with food production for land and water; fertiliser and pesticide use has its own environmental impact; many bioplastics are not biodegradable in practical conditions (they require industrial composting at specific temperatures); and mixing bioplastics with conventional plastics in recycling streams contaminates both. The LCA limitation is that it requires assumptions about system boundaries, allocation methods and impact weighting that are inherently subjective. Different LCA methodologies can produce contradictory conclusions about the same comparison. A truly circular approach might focus on reducing plastic use and designing for recyclability rather than simply switching feedstock.
Delivery rationale
Secondary science knowledge concept — factual/theoretical content with clear misconceptions to diagnose.