Homeschool Guide: These lesson plans are a guide for parents. Content may contain errors ā€” always cross-reference with official exam board specifications.

C24: Cracking And Alkenes

FoundationHigherAll Boards

4 detailed 50-minute lessons with teaching scripts, worked examples, parent guides, and assessment criteria.

Fastmail

Lesson Overview

Total Lessons: 4
Tier: Foundation and Higher
Duration: 50 minutes per lesson (200 minutes total)
Exam Boards: AQA, Edexcel, OCR, CCEA

Learning Objectives

Prerequisites

Materials & Equipment

Lesson 1: Introduction: Cracking And Alkenes

Duration: 50 minutes

Starter Activity (5 minutes)

Quick Recall

3 quick questions to activate prior knowledge about cracking and alkenes. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: key terminology for c24.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Cracking And Alkenes. Goal: deliver a c24 lesson confidently, addressing the key concepts and common misconceptions. Connects to C23 hydrocarbons and crude oil because each lesson builds on the last, so revise the prior topic before starting."
Mins 5-15 - Direct Instruction: 1) Define: "Cracking And Alkenes is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like connect c24 to a real-world situation students recognise..."
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: A standard exam question on c24.

  1. What is asked? Explain
  2. Recall knowledge: The key facts about c24 from your revision notes.
  3. Apply: Work through the c24 method step by step, showing all reasoning.
  4. Check: Check units and sense-check your answer against what you expect.
  5. Answer: State the complete final answer with appropriate units or detail.

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: A multi-step question on c24.

  1. Break down: Separate parts?
  2. Solve each: Break the question into parts and solve each one, showing working.
  3. Combine: Each part feeds the next ā€” chain your answers logically.
  4. Final answer: State the complete final answer to the multi-step question on c24.
Worked Example 3: Data/Application

Q: Interpret the data in the context of c24.

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using cracking and alkenes
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does the core principle of c24 work this way?"
A: Analogy: "a comparison that makes c24 memorable". Try re-write the key points from memory, then check against the lesson notes.
Q: "Wrong answers on calculations."
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.
Q: "Exam wording confuses me."
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.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Cracking And Alkenes 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: An exam question on c24 - AQA style]

  • 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 C23 hydrocarbons and crude oil / C25 alcohols carboxylic acids and esters
  • 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 cracking and alkenes, summarise 100 words

Plenary (5 mins)

Label the Diagram

Unlabelled diagram - write all parts in 1 min

Assessment Criteria

Lesson 2: Core Concepts: Cracking And Alkenes

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on cracking and alkenes. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: key terminology for c24.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Cracking And Alkenes. Goal: deliver a c24 lesson confidently, addressing the key concepts and common misconceptions. Connects to C23 hydrocarbons and crude oil because each lesson builds on the last, so revise the prior topic before starting."
Mins 5-15 - Direct Instruction: 1) Define: "Cracking And Alkenes is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like connect c24 to a real-world situation students recognise..."
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: A standard exam question on c24.

  1. What is asked? Explain
  2. Recall knowledge: The key facts about c24 from your revision notes.
  3. Apply: Work through the c24 method step by step, showing all reasoning.
  4. Check: Check units and sense-check your answer against what you expect.
  5. Answer: State the complete final answer with appropriate units or detail.

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: A multi-step question on c24.

  1. Break down: Separate parts?
  2. Solve each: Break the question into parts and solve each one, showing working.
  3. Combine: Each part feeds the next ā€” chain your answers logically.
  4. Final answer: State the complete final answer to the multi-step question on c24.
Worked Example 3: Data/Application

Q: Interpret the data in the context of c24.

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using cracking and alkenes
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does the core principle of c24 work this way?"
A: Analogy: "a comparison that makes c24 memorable". Try re-write the key points from memory, then check against the lesson notes.
Q: "Wrong answers on calculations."
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.
Q: "Exam wording confuses me."
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.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Cracking And Alkenes 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: An exam question on c24 - AQA style]

  • 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 C23 hydrocarbons and crude oil / C25 alcohols carboxylic acids and esters
  • 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 cracking and alkenes, summarise 100 words

Plenary (5 mins)

Label the Diagram

Unlabelled diagram - write all parts in 1 min

Assessment Criteria

Lesson 3: Application: Cracking And Alkenes

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on cracking and alkenes. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: key terminology for c24.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Cracking And Alkenes. Goal: deliver a c24 lesson confidently, addressing the key concepts and common misconceptions. Connects to C23 hydrocarbons and crude oil because each lesson builds on the last, so revise the prior topic before starting."
Mins 5-15 - Direct Instruction: 1) Define: "Cracking And Alkenes is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like connect c24 to a real-world situation students recognise..."
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: A standard exam question on c24.

  1. What is asked? Explain
  2. Recall knowledge: The key facts about c24 from your revision notes.
  3. Apply: Work through the c24 method step by step, showing all reasoning.
  4. Check: Check units and sense-check your answer against what you expect.
  5. Answer: State the complete final answer with appropriate units or detail.

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: A multi-step question on c24.

  1. Break down: Separate parts?
  2. Solve each: Break the question into parts and solve each one, showing working.
  3. Combine: Each part feeds the next ā€” chain your answers logically.
  4. Final answer: State the complete final answer to the multi-step question on c24.
Worked Example 3: Data/Application

Q: Interpret the data in the context of c24.

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using cracking and alkenes
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does the core principle of c24 work this way?"
A: Analogy: "a comparison that makes c24 memorable". Try re-write the key points from memory, then check against the lesson notes.
Q: "Wrong answers on calculations."
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.
Q: "Exam wording confuses me."
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.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Cracking And Alkenes 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: An exam question on c24 - AQA style]

  • 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 C23 hydrocarbons and crude oil / C25 alcohols carboxylic acids and esters
  • 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 cracking and alkenes, summarise 100 words

Plenary (5 mins)

Exam Question Speed Round

5 quick questions, 1 min each. Mark together.

Assessment Criteria

Lesson 4: Exam Practice: Cracking And Alkenes

Duration: 50 minutes

Starter Activity (5 minutes)

Review Previous Lesson

Quick recap: write 3 key points from last lesson on cracking and alkenes. Use mini-whiteboard or paper.

Main Content (35 minutes)

Parent/Teacher Guide:
Before lesson: Read script below. Prepare materials. Pre-teach key vocab: key terminology for c24.
If stuck: See Troubleshooting below. Break into smaller steps.
Extension: See Stretch & Challenge section.
Teaching Script (35 mins):
Mins 0-5 - Hook: "Today: Cracking And Alkenes. Goal: deliver a c24 lesson confidently, addressing the key concepts and common misconceptions. Connects to C23 hydrocarbons and crude oil because each lesson builds on the last, so revise the prior topic before starting."
Mins 5-15 - Direct Instruction: 1) Define: "Cracking And Alkenes is..." 2) Key principle: "Most important:..." 3) Draw diagram, label live. 4) Real example: "Like connect c24 to a real-world situation students recognise..."
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: A standard exam question on c24.

  1. What is asked? Explain
  2. Recall knowledge: The key facts about c24 from your revision notes.
  3. Apply: Work through the c24 method step by step, showing all reasoning.
  4. Check: Check units and sense-check your answer against what you expect.
  5. Answer: State the complete final answer with appropriate units or detail.

Tip: "Show working - method marks > answer marks."

Worked Example 2: Multi-step

Q: A multi-step question on c24.

  1. Break down: Separate parts?
  2. Solve each: Break the question into parts and solve each one, showing working.
  3. Combine: Each part feeds the next ā€” chain your answers logically.
  4. Final answer: State the complete final answer to the multi-step question on c24.
Worked Example 3: Data/Application

Q: Interpret the data in the context of c24.

  1. Read data: Axes, units, scale
  2. Patterns: Trends, anomalies
  3. Explain: Why? Using cracking and alkenes
  4. Conclude: Evidence-based

Common Questions & Troubleshooting

Q: "Why does the core principle of c24 work this way?"
A: Analogy: "a comparison that makes c24 memorable". Try re-write the key points from memory, then check against the lesson notes.
Q: "Wrong answers on calculations."
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.
Q: "Exam wording confuses me."
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.

Assessment & Model Answers

Mastery Checklist:
  • [ ] Define Cracking And Alkenes 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: An exam question on c24 - AQA style]

  • 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 C23 hydrocarbons and crude oil / C25 alcohols carboxylic acids and esters
  • 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 cracking and alkenes, summarise 100 words

Plenary (5 mins)

Exam Question Speed Round

5 quick questions, 1 min each. Mark together.

Assessment Criteria

šŸ“ Mark Scheme Guidance

How examiners mark C24: Read the command word carefully ā€” State = one word/phrase (1 mark), Describe = pattern or detail (2 marks), Explain = reason with "because" (2ā€“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 ā€” unexplained answers score zero for AO2.

Success on C24 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: all chemistry topics on GCSE Revise (notes, flashcards and auto-graded target tests for this exact topic).

šŸ“ Reference Diagram

Nucleus pāŗ nā° Electron eā» Electron shell

āœļø Draw-Along Instructions

Parent/teacher: Draw the key diagram for organic: 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

Recommended Resources

šŸŽ“ Smart Lesson (Guided)