sustainable chemistry
4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.
Lesson Overview
Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, Eduqas, CCEA
Learning Objectives
- Explain the key ideas of sustainable chemistry
- Apply sustainable chemistry to exam-style questions
- Develop independent study skills
- Build cross-topic connections
Prerequisites
- Read the revision notes for sustainable chemistry first (GCSE Revise summary)
- Key vocab to pre-teach: Sustainability, Corrosion, Sacrificial protection
- Basic skills: reading the summary notes and answering the practice questions there
Materials & Equipment
- Exercise book, coloured pens
- Scientific calculator
- Ruler
- Printed revision notes (link below)
- Internet for videos (see Resources)
Lesson 1: Introduction: sustainable chemistry
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Write down everything you already know about sustainable chemistry. Then check against the key terms: Sustainability, Corrosion, Sacrificial protection. Use a mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read the script below. Pre-teach key vocab: Sustainability, Corrosion, Sacrificial protection.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Before lesson: Read the script below. Pre-teach key vocab: Sustainability, Corrosion, Sacrificial protection.
If stuck: Re-read the revision notes (link above), then break the content into smaller steps.
Extension: See the Stretch & Challenge ideas in Lesson 4.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: sustainable chemistry. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Combined Science (Trilogy) because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
Mins 0-5 - Hook: "Today: sustainable chemistry. By the end you will be able to answer exam questions on it unaided. It connects to the rest of Combined Science (Trilogy) because the ideas here recur across the spec."
Mins 5-20 - Direct Instruction: Work through the core ideas below one at a time; after each, ask your student to explain it back in their own words.
Mins 20-30 - Guided Practice: Model the worked example together, then let your student attempt the first practice question with guidance.
Mins 30-35 - Independent Practice: 2-3 practice questions from Lesson 3 below, with immediate feedback.
First Look
Start with the revision notes summary, then attempt: explain the key ideas of sustainable chemistry
Plenary (5 minutes)
Check Out
Your student states one thing they learned and one question they still have about sustainable chemistry.
Lesson 2: Core Concepts: sustainable chemistry
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from Lesson 1 on sustainable chemistry. Check them against the notes below.
Main Content (35 minutes)
Sustainability: means meeting the needs of the present without compromising the ability of future generations to meet their own needs. In chemistry, this means using resources responsibly and minimising environmental impact.
The reduce, reuse, recycle principles help conserve finite resources and reduce waste and environmental impact.
Corrosion: is the deterioration of metals by reaction with substances in the environment. Rusting is the corrosion of iron, which requires both oxygen and water . Corrosion weakens metals and can be dangerous and expensive.
Sacrificial protection: works because a more reactive metal (e.g. zinc, magnesium) will oxidise in preference to iron. The more reactive metal sacrifices itself to protect the iron.
A life cycle assessment (LCA) assesses the environmental impact of a product at each stage of its life: raw materials , manufacturing , using , and disposing .
An alloy is a mixture of a metal with one or more other elements. Alloys are harder than pure metals because the different-sized atoms disrupt the regular structure, preventing layers from sliding over each other.
| Term | Meaning | Example |
|---|---|---|
| Reduce | Use less of a resource in the first place | Use less packaging; reduce energy consumption |
| Reuse | Use a product again for the same or a different purpose | Reuse glass bottles; repurpose containers |
| Recycle | Process waste materials to make new products | Recycle aluminium cans, glass, paper, plastics |
| Painting | Creates a barrier between the metal and air/water | Car bodies, bridges, garden gates |
| Oiling / greasing | Creates a water-repellent barrier | Bicycle chains, machine parts |
| Galvanising | Coating iron/steel with a layer of zinc . Zinc acts as a barrier and also provides sacrificial protection | Galvanised buckets, fencing, roofing |
| Sacrificial protection | Attaching a more reactive metal (e.g. zinc or magnesium) that corrodes instead of the iron | Ship hulls, underground pipes, bridge supports |
| Raw materials | Extraction, processing, transport; energy use and pollution | Crude oil extracted and refined (finite resource, energy, CO₂) |
Practice (10 minutes)
Q: explain the key ideas of sustainable chemistry
Answer:
Plenary (5 minutes)
Explain Back
Your student teaches the key points back to you without looking. Fill any gaps immediately.
Lesson 3: Application: sustainable chemistry
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
Recall the key terms: Sustainability, Corrosion, Sacrificial protection. Define each in one sentence.
Main Content (35 minutes)
Parent/Teacher Guide: Let your student attempt each question alone first, then compare with the model answer. Award method marks for correct working even if the final answer is wrong.
Work through the practice questions on the revision notes page for this topic.
Plenary (5 minutes)
Error Review
Review any questions answered incorrectly. Identify whether the error was knowledge, method, or reading the question.
Lesson 4: Exam Practice: sustainable chemistry
Duration: 50 minutes
Starter Activity (5 minutes)
Command Words
Review what these command words require: state (one point), describe (say what happens), explain (say why), compare (both sides), evaluate (judgement).
Main Content (35 minutes)
Extended Answer
Extended question: Extended Answer 6 marks: Explain how rusting occurs, describe three methods of preventing corrosion, and evaluate which method is best for protecting a ship's hull. <div class="
Rusting is the corrosion of iron, which requires both oxygen and water. The iron reacts with oxygen and water to form hydrated iron(III) oxide (rust), which is flaky and weakens the metal. Three methods of preventing corrosion are: painting, which creates a barrier between the metal and air/water; galvanising, which coats the iron with zinc providing both a barrier and sacrificial protection; and sacrificial protection, where a more reactive metal (zinc or magnesium) is attached to the iron and corrodes instead. For a ship's hull, sacrificial protection is the best method. Painting is impractical because it would need constant repainting on the underwater surface and any scratches would expose the iron. Galvanising is difficult to apply to large steel structures. Sacrificial protection using zinc or magnesium blocks bolted to the hull works because these metals are more reactive than iron and will corrode in its place. When the blocks wear away, they can be replaced, making this a practical and effective long-term solution. Mark scheme: 1 mark for rusting needs oxygen AND water; 1 mark for painting as barrier; 1 mark for galvanising (barrier + sacrificial); 1 mark for sacrificial p
Common Errors: Watch Out! 1. Wrong: Rusting only needs oxygen Correct: Rusting requires BOTH oxygen AND water — if either is absent, iron will not rust 2. Wrong: Galvanising only works as a barrier Correct: Galvanising provides BOTH a barrier AND sacrificial protection — even if the zinc layer is scratched, the zinc corrodes in preference to the iron 3. Wrong: Recycling always uses less energy than extracting from raw materials Correct: Recycling almost always uses less energy, but it still requires energy for collection, sorting, cleaning and reprocessing — it is not free 4. Wrong: Alloys are compounds Correct: Alloys are MIXTURES, not compounds — the different elements are mixed together but not chemical
AO3 - Reasoning & Interpretation: Copper pipe: made from copper ore (finite resource); manufacturing uses 50 MJ/m; lasts 80 years; can be recycled; costs £15/m | PVC pipe: made from crude oil (finite resource); manufacturing uses 8 MJ/m; lasts 50 years; cannot be easily recycled; costs £4/m
Stretch & Challenge (Grade 8-9):
- Synoptic links: explain how sustainable chemistry connects to another Combined Science (Trilogy) topic you have studied
- Real-world: research one real-world use or example of sustainable chemistry
- Critical: "What are the limitations of the models used in sustainable chemistry?"
Plenary (5 minutes)
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts - re-run Lesson 2
Homework & Consolidation
- Consolidation: Re-answer any Lesson 3 practice questions answered incorrectly (20 mins)
- Retrieval: Write flashcards for the key terms: Sustainability, Corrosion, Sacrificial protection (10 mins)
- Exam practice: One past-paper question on sustainable chemistry from the board websites (15 mins)
- Extension: Explain sustainable chemistry to someone else in your own words (10 mins)