Using resources: GCSE Combined Science
Finite and renewable resources, potable water, waste water, life cycle assessment, recycling, corrosion and alloys
The short version
Potable water is not the same as pure water — it is safe to drink. LCA looks at a product from raw materials to disposal. Alloys are mixtures of metals with better properties.
Key idea
Name one finite and one renewable in any 2-mark definition
Grade 2–3: Oil and metal ores will run out. Wood can grow again if we plant trees.
Grade 5–6: I can define both words with examples and I know fresh water can still be scarce.
Grade 9: A 4-mark evaluate wants an advantage, a disadvantage, and a conclusion with a reason. Renewable does not mean infinite right now.
Go a bit deeper
UK: choose a low-contamination source → sand filter beds → sterilise
Grade 2–3: Safe to drink is not the same as pure water with nothing in it. Chlorine kills germs.
Grade 5–6: I can name filtration and chlorination, and I know sea water needs extra energy to remove salt.
Grade 9: A full RP answer names a test for the distillate (no crystals / no chloride ppt / BP near 100 °C), not just we distilled it.
Worked example
Worked example
Grade 2–3: Oil and metal ores will run out. Wood can grow again if we plant trees. Grade 5–6: I can define both words with examples and I know fresh water can still be scarce. Grade 9: A 4-mark evaluate wants an advantage, a disadvantage, and a conclusion with a reason. Renewable does not mean infinite right now.
Lessons in this topic
- Finite and renewable resources
- Potable water (required practical)
- Waste water
- Life cycle assessment
- Recycling
- Corrosion and alloys (Combined)
In the app each lesson is video (when we have a real YouTube id) then intro, learn and summary steps.
What the examiner wants
Required practical: distill salt water and test pH / boiling point. Waste water: screening, sedimentation, aerobic treatment, anaerobic sludge digestion. Sacrificial protection uses a more reactive metal.
Try these questions
Cover the answers and have a go first. Worked solutions are underneath.
A finite resource
Timber can be renewable if
Potable water means
In the UK, treated tap water is often sterilised with
Common mistakes
- Renewable does not mean infinite right now. Overfishing and deforestation can still destroy a renewable resource.
- Boiling at home kills microbes but does not remove most dissolved salts. Potable is not chemically pure.
- Do not swap aerobic and anaerobic. Sludge digestion is anaerobic; the effluent treatment tanks are aerobic.
- An LCA is not the same as a price tag. Cheap can still be environmentally costly. Do not quote only the stage that makes your product look good.
Answers and working
Frequently asked questions
Is GCSE Using resources on Combined Science and Triple?
Using resources is on Combined Science and on Triple Chemistry. Progress is shared in the ReviseEasy app.
Which exam board is this Using resources page for?
The ideas are board-agnostic for AQA, Edexcel, OCR, WJEC and CCEA. Paper lengths and question numbers differ — check your specification.
Is Using resources Foundation or Higher?
The core ideas appear on both tiers. Higher papers add extra application and some HT-only detail, marked in lessons with a Higher badge.
Learn, try, get feedback, fix the mistake
Open the stepped lesson, then the quiz with hints. Required-practical and calculation questions use the same method you will need in the paper.
Learn Using resources on ReviseEasy →Related revision
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