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Hand-picked clips from the best free teachers. Each one sits on its star, comes with ready-made cards where we have them, and carries a Heddy Score.

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Every clip, with its Heddy Score and where it sits on your map.

Showing 25 clips
YouTube4:22

GCSE Chemistry - States of Matter & Changing State

CognitoChemistry
On your map
gcse-chem-5-2-2-1States of matter and the forces between particles · GCSE
c1Particle model & states · KS3 Y7
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YouTube4:50

GCSE Chemistry Revision "Introducing Electrolysis"

FreesciencelessonsChemistry
On your map
gcse-chem-5-4-3-1Electrolysis: the process · GCSE
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YouTube18:49

GENERAL CHEMISTRY explained in 19 Minutes

Wacky ScienceChemistry
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gcse-chem-5-2-1-5Metallic bonding · GCSE
gcse-chem-5-2-1-1The three types of chemical bond · GCSE
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YouTube11:19

Orbitals, Atomic Energy Levels, & Sublevels Explained - Basic Introduction to Quantum Numbers

The Organic Chemistry TutorChemistry
On your map
gcse-chem-5-1-1-7Electronic structure · GCSE
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YouTube6:32

GCSE Chemistry - Paper Chromatography

CognitoChemistry
On your map
gcse-chem-5-8-1-3Chromatography and Rf values · GCSE
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YouTube4:37

GCSE Chemistry Revision "Crude oil and Hydrocarbons"

FreesciencelessonsChemistry
On your map
gcse-chem-5-7-1-1aCrude oil and hydrocarbons · GCSE
gcse-chem-5-7-1-1bAlkanes · GCSE
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YouTube4:32

GCSE Chemistry Revision "Required Practical 5: Rates of Reaction"

FreesciencelessonsChemistry
On your map
gcse-chem-5-6-1-2Factors that affect the rate of reaction · GCSE
gcse-chem-5-6-1-1aMean rate of reaction · GCSE
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YouTube5:30

GCSE Chemistry - Crude Oil and Fractional Distillation

CognitoChemistry
On your map
gcse-chem-5-7-1-1aCrude oil and hydrocarbons · GCSE
gcse-chem-5-7-1-2Fractional distillation and petrochemicals · GCSE
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YouTube5:47

GCSE Chemistry Revision "Balancing Chemical Equations"

FreesciencelessonsChemistry
On your map
gcse-chem-5-1-1-1bNaming compounds and writing equations · GCSE
c52Balancing symbol equations · KS3 Y9
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YouTube3:42

GCSE Chemistry Revision "Required Practical 2: Carrying out a Titration" (Triple)

FreesciencelessonsChemistry
On your map
gcse-chem-5-4-2-2Neutralisation and making salts · GCSE
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YouTube4:05

GCSE Chemistry Revision "Exothermic and Endothermic Reactions"

FreesciencelessonsChemistry
On your map
gcse-chem-5-5-1-1Exothermic and endothermic reactions · GCSE
gcse-chem-5-5-1-2Reaction profiles and activation energy · GCSE
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YouTube3:27

GCSE Chemistry Revision "Reaction of Metals with Oxygen"

FreesciencelessonsChemistry
On your map
gcse-chem-5-4-1-1Metal oxides: oxidation and reduction · GCSE
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YouTube4:48

GCSE Chemistry Revision "Electrolysis of Aluminium Oxide"

FreesciencelessonsChemistry
On your map
gcse-chem-5-4-3-3Extracting metals by electrolysis · GCSE
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YouTube3:57

GCSE Chemistry Revision "Required Practical 3: Electrolysis"

FreesciencelessonsChemistry
On your map
gcse-chem-5-4-3-4Electrolysis of solutions in water · GCSE
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YouTube3:16

GCSE Chemistry Revision "Fractional Distillation of Crude Oil"

FreesciencelessonsChemistry
On your map
gcse-chem-5-7-1-2Fractional distillation and petrochemicals · GCSE
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YouTube4:34

GCSE Chemistry Revision "The Reactivity Series"

FreesciencelessonsChemistry
On your map
gcse-chem-5-4-1-2The reactivity series · GCSE
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YouTube3:33

GCSE Chemistry - What is a Polymer? Polymers / Monomers / Their Properties Explained (2026/27 exams)

CognitoChemistry
On your map
gcse-chem-5-2-2-5Polymers as very large molecules · GCSE
c29Polymers: long-chain molecules · KS3 Y8
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YouTube4:35

GCSE Chemistry Revision "Required Practical 6: Chromatography"

FreesciencelessonsChemistry
On your map
gcse-chem-5-8-1-3Chromatography and Rf values · GCSE
c17Chromatography · KS3 Y8
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YouTube23:55

Bonding (Ionic, Covalent & Metallic) - GCSE Chemistry - long version

Science ShortsChemistry
On your map
c36Groups & periods · KS3 Y8
gcse-chem-5-2-1-5Metallic bonding · GCSE
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YouTube11:16

Types of Bonding (Ionic, Covalent, Metallic) - GCSE Chemistry Revision

Miss Wetton - GCSE Science RevisionChemistry
On your map
gcse-chem-5-2-1-4aCovalent bonds and small molecules · GCSE
gcse-chem-5-2-1-1The three types of chemical bond · GCSE
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YouTube4:17

GCSE Chemistry Revision "Elements, Compounds and Mixtures"

FreesciencelessonsChemistry
On your map
c2Atoms, elements & compounds · KS3 Y7
c22Compounds vs mixtures · KS3 Y7
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YouTube2:36

GCSE Chemistry Revision "Properties of Hydrocarbons"

FreesciencelessonsChemistry
On your map
gcse-chem-5-7-1-3aHydrocarbon properties and molecule size · GCSE
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YouTube6:03

GCSE Chemistry - Moles, Concentration & Volume Calculations

CognitoChemistry
On your map
gcse-chem-5-3-2-5Concentration in grams per cubic decimetre · GCSE
ch1Moles — counting by weighing · GCSE
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