C17: Electrolysis
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, CCEA
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, CCEA
Learning Objectives
- Master core concepts of electrolysis
- Apply to exam questions confidently
- Develop independent study skills
- Build cross-topic connections
Prerequisites
- Review C16 reactions of acids
- Key vocab: key vocabulary for c17
- Basic skills: basic literacy and numeracy
Materials & Equipment
- Exercise book, coloured pens
- Scientific calculator
- Ruler, protractor, compass (if needed)
- Printed spec/textbook reference
- Internet for videos (see Resources)
Lesson 1: Introduction: Electrolysis
Duration: 50 minutes
Starter Activity (5 minutes)
Quick Recall
3 quick questions to activate prior knowledge about electrolysis. Use mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Electrolysis.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Electrolysis.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Electrolysis. Goal: by the end you can in electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Electrolysis is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Mins 0-5 - Hook: "Today: Electrolysis. Goal: by the end you can in electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Electrolysis is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- What is asked? In
- Recall knowledge:
- Apply:
- Check: Check the units named in the question and sense-check the size of your answer.
- Answer: State the complete final answer.
Tip: "Show working - method marks > answer marks."
Worked Example 2: Multi-step
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- Break down: Separate parts?
- Solve each:
- Combine: The parts chain: each answer feeds the next step of the question.
- Final answer: Evidence cited from the lesson content.
Worked Example 3: Data/Application
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- Read data: Axes, units, scale
- Patterns: Trends, anomalies
- Explain: Why? Using electrolysis
- Conclude: Evidence-based
Common Questions & Troubleshooting
Q: "Why does Electrolysis work this way?"
A: Analogy: "In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch". Try re-draw or re-write the worked example from memory, then check it against the model answer.
A: Analogy: "In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch". Try re-draw or re-write the worked example from memory, then check it against the model answer.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.
Assessment & Model Answers
Mastery Checklist:
- [ ] Define Electrolysis in own words
- [ ] Identify features in diagram
- [ ] Explain process step-by-step
- [ ] Apply to unfamiliar context
- [ ] Score 80%+ on past paper question
Model Answer: Past Paper Question
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- 1 mark: [Key terminology]
- 1 mark: [Mechanism/process]
- 1 mark: [Application/example]
- 1 mark: [Evaluation - Higher]
Model response: "[Complete answer with expected detail/terminology]"
Why full marks: [What makes this strong]
Stretch & Challenge (Grade 8-9):
- Synoptic links: Connect to C16-reactions-of-acids / C18-oxidation-and-reduction
- Real-world: Research use in industry, medicine or research
- Advanced calc: Try a more challenging variant
- Critical: "Evaluate limitations of today's model"
- Research: Recent discovery on electrolysis, summarise 100 words
Plenary (5 mins)
Label the Diagram
Unlabelled diagram - write all parts in 1 min
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts, needs reteaching
Lesson 2: Core Concepts: Electrolysis
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from last lesson on electrolysis. Use mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Electrolysis.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Electrolysis.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Electrolysis. Goal: by the end you can in electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Electrolysis is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Mins 0-5 - Hook: "Today: Electrolysis. Goal: by the end you can in electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Electrolysis is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- What is asked? In
- Recall knowledge:
- Apply:
- Check: Check the units named in the question and sense-check the size of your answer.
- Answer: State the complete final answer.
Tip: "Show working - method marks > answer marks."
Worked Example 2: Multi-step
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- Break down: Separate parts?
- Solve each:
- Combine: The parts chain: each answer feeds the next step of the question.
- Final answer: Evidence cited from the lesson content.
Worked Example 3: Data/Application
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- Read data: Axes, units, scale
- Patterns: Trends, anomalies
- Explain: Why? Using electrolysis
- Conclude: Evidence-based
Common Questions & Troubleshooting
Q: "Why does Electrolysis work this way?"
A: Analogy: "In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch". Try re-draw or re-write the worked example from memory, then check it against the model answer.
A: Analogy: "In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch". Try re-draw or re-write the worked example from memory, then check it against the model answer.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.
Assessment & Model Answers
Mastery Checklist:
- [ ] Define Electrolysis in own words
- [ ] Identify features in diagram
- [ ] Explain process step-by-step
- [ ] Apply to unfamiliar context
- [ ] Score 80%+ on past paper question
Model Answer: Past Paper Question
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- 1 mark: [Key terminology]
- 1 mark: [Mechanism/process]
- 1 mark: [Application/example]
- 1 mark: [Evaluation - Higher]
Model response: "[Complete answer with expected detail/terminology]"
Why full marks: [What makes this strong]
Stretch & Challenge (Grade 8-9):
- Synoptic links: Connect to C16-reactions-of-acids / C18-oxidation-and-reduction
- Real-world: Research use in industry, medicine or research
- Advanced calc: Try a more challenging variant
- Critical: "Evaluate limitations of today's model"
- Research: Recent discovery on electrolysis, summarise 100 words
Plenary (5 mins)
Label the Diagram
Unlabelled diagram - write all parts in 1 min
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts, needs reteaching
Lesson 3: Application: Electrolysis
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from last lesson on electrolysis. Use mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Electrolysis.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Electrolysis.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Electrolysis. Goal: by the end you can in electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Electrolysis is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Mins 0-5 - Hook: "Today: Electrolysis. Goal: by the end you can in electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Electrolysis is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- What is asked? In
- Recall knowledge:
- Apply:
- Check: Check the units named in the question and sense-check the size of your answer.
- Answer: State the complete final answer.
Tip: "Show working - method marks > answer marks."
Worked Example 2: Multi-step
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- Break down: Separate parts?
- Solve each:
- Combine: The parts chain: each answer feeds the next step of the question.
- Final answer: Evidence cited from the lesson content.
Worked Example 3: Data/Application
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- Read data: Axes, units, scale
- Patterns: Trends, anomalies
- Explain: Why? Using electrolysis
- Conclude: Evidence-based
Common Questions & Troubleshooting
Q: "Why does Electrolysis work this way?"
A: Analogy: "In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch". Try re-draw or re-write the worked example from memory, then check it against the model answer.
A: Analogy: "In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch". Try re-draw or re-write the worked example from memory, then check it against the model answer.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.
Assessment & Model Answers
Mastery Checklist:
- [ ] Define Electrolysis in own words
- [ ] Identify features in diagram
- [ ] Explain process step-by-step
- [ ] Apply to unfamiliar context
- [ ] Score 80%+ on past paper question
Model Answer: Past Paper Question
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- 1 mark: [Key terminology]
- 1 mark: [Mechanism/process]
- 1 mark: [Application/example]
- 1 mark: [Evaluation - Higher]
Model response: "[Complete answer with expected detail/terminology]"
Why full marks: [What makes this strong]
Stretch & Challenge (Grade 8-9):
- Synoptic links: Connect to C16-reactions-of-acids / C18-oxidation-and-reduction
- Real-world: Research use in industry, medicine or research
- Advanced calc: Try a more challenging variant
- Critical: "Evaluate limitations of today's model"
- Research: Recent discovery on electrolysis, summarise 100 words
Plenary (5 mins)
Exam Question Speed Round
5 quick questions, 1 min each. Mark together.
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts, needs reteaching
Lesson 4: Exam Practice: Electrolysis
Duration: 50 minutes
Starter Activity (5 minutes)
Review Previous Lesson
Quick recap: write 3 key points from last lesson on electrolysis. Use mini-whiteboard or paper.
Main Content (35 minutes)
Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Electrolysis.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: Electrolysis.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Electrolysis. Goal: by the end you can in electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Electrolysis is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Mins 0-5 - Hook: "Today: Electrolysis. Goal: by the end you can in electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch, using the method shown step by step. Connects to the previous lesson in this unit because you'll reuse its method throughout today's work."
Mins 5-15 - Direct Instruction: 1) Define: "Electrolysis is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch - a real example worked through in full..."
Mins 15-25 - Guided Practice: Ex1: Teacher models. Ex2: Student tries with guidance. Ex3: Student independent.
Mins 25-35 - Independent Practice: 3-5 questions. Immediate feedback.
Worked Example 1: Basic
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- What is asked? In
- Recall knowledge:
- Apply:
- Check: Check the units named in the question and sense-check the size of your answer.
- Answer: State the complete final answer.
Tip: "Show working - method marks > answer marks."
Worked Example 2: Multi-step
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- Break down: Separate parts?
- Solve each:
- Combine: The parts chain: each answer feeds the next step of the question.
- Final answer: Evidence cited from the lesson content.
Worked Example 3: Data/Application
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- Read data: Axes, units, scale
- Patterns: Trends, anomalies
- Explain: Why? Using electrolysis
- Conclude: Evidence-based
Common Questions & Troubleshooting
Q: "Why does Electrolysis work this way?"
A: Analogy: "In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch". Try re-draw or re-write the worked example from memory, then check it against the model answer.
A: Analogy: "In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch". Try re-draw or re-write the worked example from memory, then check it against the model answer.
Q: "Wrong answers on calculations."
A: Checklist: units? formula? calculator mode? sig figs?
A: Checklist: units? formula? calculator mode? sig figs?
Q: "Can't remember key terms."
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
A: Flashcards (term front, def+diagram back). Spaced repetition: day 1, 3, 7.
Q: "Exam wording confuses me."
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
A: Commands: Describe=what you see; Explain=reasons; Evaluate=pros/cons+judgement; Calculate=working+units.
Q: "Running out of time."
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.
A: 1 mark/min. Skip hard, return. Attempt all - partial marks count.
Assessment & Model Answers
Mastery Checklist:
- [ ] Define Electrolysis in own words
- [ ] Identify features in diagram
- [ ] Explain process step-by-step
- [ ] Apply to unfamiliar context
- [ ] Score 80%+ on past paper question
Model Answer: Past Paper Question
Q: In electrolysis, a direct current is passed through the electrolyte. The positive electrode is the anode and the negative electrode is the cathode. Ions move towards the electrode with the opposite ch
- 1 mark: [Key terminology]
- 1 mark: [Mechanism/process]
- 1 mark: [Application/example]
- 1 mark: [Evaluation - Higher]
Model response: "[Complete answer with expected detail/terminology]"
Why full marks: [What makes this strong]
Stretch & Challenge (Grade 8-9):
- Synoptic links: Connect to C16-reactions-of-acids / C18-oxidation-and-reduction
- Real-world: Research use in industry, medicine or research
- Advanced calc: Try a more challenging variant
- Critical: "Evaluate limitations of today's model"
- Research: Recent discovery on electrolysis, summarise 100 words
Plenary (5 mins)
Exam Question Speed Round
5 quick questions, 1 min each. Mark together.
Assessment Criteria
- Got it: Confident explanation + correct worked examples
- Getting there: Main points OK, needs support with detail
- Not yet: Confused on key concepts, needs reteaching
📝 Mark Scheme Guidance
How examiners mark C17: Read the command word carefully — State = one word/phrase (1 mark), Describe = pattern or detail (2 marks), Explain = reason with "because" (2–3 marks), Compare = similarities AND differences, Evaluate = both sides + conclusion. Method marks are awarded for correct working even if the final answer is wrong. Always show your working — unexplained answers score zero for AO2.
Success on C17 questions: Underline the command word, count the marks (one mark per point expected), and answer in the format the command word demands.
Board Notes & Revision Links
This lesson is examined by: AQA 8462 | Edexcel 1CH0 | OCR J248 | CCEA units. Tier and paper details vary - always check your board's current specification.
Follow-up revision: C14-electrolysis on GCSE Revise (notes, flashcards and auto-graded target tests for this exact topic).
📐 Reference Diagram
✏️ Draw-Along Instructions
Parent/teacher: Draw the key diagram for chemical-changes: start with the main structure, add labels with arrows, then annotate with the key facts from the lesson. Use a ruler for straight lines.
Display the reference diagram (or draw it live) while pupils copy. Check each label as it is added.
Homework & Consolidation
- Consolidation: Textbook end-of-topic questions (30 mins)
- Retrieval: 10 flashcards for key terms (15 mins)
- Exam practice: 2 past paper questions (20 mins)
- Extension: Research real-world application (optional, 30 mins)