Chemistry · GCSE · Organic Chemistry

Cracking

gcse-chem-5-7-1-4aFree0:26Heddy Score 3 of 7, below the standard

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What you need to know

  • Cracking breaks long hydrocarbons into shorter, more useful ones.
  • It uses heat with a catalyst or steam.

In this clip

0:52–5:08Mean rate of reactiongcse-chem-5-6-1-1a
5:08–10:36Factors that affect the rate of reactiongcse-chem-5-6-1-2
10:36–11:37Catalysts and activation energygcse-chem-5-6-1-4
11:37–13:12Le Chatelier's principlegcse-chem-5-6-2-4
13:12–15:33Alkanesgcse-chem-5-7-1-1b
15:33–16:41Fractional distillation and petrochemicalsgcse-chem-5-7-1-2
16:41–17:07Crackinggcse-chem-5-7-1-4a
17:07–17:32Alkenes and the bromine water testgcse-chem-5-7-1-4b
17:32–17:47Complete combustion of hydrocarbonsgcse-chem-5-7-1-3b
17:56–18:50Pure substances & mixturesc13
18:50–19:26Chromatography and Rf valuesgcse-chem-5-8-1-3
19:26–20:11Testing common gasesc54
20:11–21:33Earth's early atmospherech7
21:33–22:22Greenhouse gasesgcse-chem-5-9-2-1
22:22–23:50Effects of global climate changegcse-chem-5-9-2-3
23:50–24:36Human activities and the evidence for climate changegcse-chem-5-9-2-2
24:36–24:55The carbon footprintgcse-chem-5-9-2-4
24:55–25:52Effects of atmospheric pollutantsgcse-chem-5-9-3-2
25:52–26:30The Earth's resources and sustainable developmentgcse-chem-5-10-1-1
26:30–27:30Making water safe to drinkch9
27:30–29:17Phytomining and bioleachinggcse-chem-5-10-1-4
29:17–30:51Life-cycle assessmentch8
36:47–38:33Polymers: long-chain moleculesc29
43:17–44:07Rusting & its preventionc56
44:07–44:37Properties of metals and alloysgcse-chem-5-2-2-7
44:37–45:02Ceramics & compositesc31
Heddy Score3/7, Below the standard
  • Trusted source · passed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · passed. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
How the Heddy Score works

Why we picked it

A long whole-paper AQA Chemistry Paper 2 revision run-through for Year 11; chapters after the combined-science marker are triple-only.

Primrose Kitten Academy | GCSE & A-Level Revision on YouTubechecked 2026-10-16