Organic ChemistryLow Exam FrequencyAQA

Cracking (HT)

Revise Cracking (HT) in Organic Chemistry for GCSE Chemistry with 24 exam-style questions and 15 flashcards. This topic appears less often, but it can still pick up marks when it appears in mixed-topic papers.

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The Oil Refinery Dilemma

Introduction 2

The Chemistry of Cracking

Deep Dive 3

Industrial Cracking Methods (Higher Tier)

Higher Tier 4

Cracking Process Overview

Diagram 5

Why Cracking Always Produces At Least One Alkene

How It Works 6

Writing and Balancing Cracking Equations

Worked Example 7

Testing for Alkenes: The Bromine Water Test

Deep Dive 8

Industrial Importance of Cracking

Key Facts 9

Key Definitions

Definitions 10

Common Misconceptions

Misconceptions 11

Memory Aid: CRACK a Big Biscuit

Memory Aid 12

Exam Focus: Cracking

Exam Focus 13

Exam Tips: Cracking

Exam Tips 14

Knowledge Organiser: Cracking

Summary

Sample Flashcards

What is cracking?

Breaking down long-chain hydrocarbons into shorter, more useful molecules

Why is cracking needed?

Long alkanes are less useful. Cracking produces shorter alkanes for fuel and alkenes for polymers

Exam questions for Cracking (HT)

What is cracking in chemistry?

A. Joining small molecules together to form polymers
B. Adding oxygen to hydrocarbon molecules
C. Breaking down long-chain hydrocarbons into shorter, more useful molecules
D. Removing hydrogen atoms from alkane molecules

1 markfoundation

Describe the conditions used in thermal cracking and state the types of product formed.

3 marksstandard

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Combustion

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Alkenes