David Tan Chemistry - Invidious

David Tan Chemistry

Chemistry made clear — one concept at a time.

Clear, step-by-step Chemistry lessons for Singapore H2 / A-Level and O-Level students.

I explain difficult concepts, correct common misconceptions, and show the reasoning behind equations, structures, calculations and mechanisms. The goal is not simply to memorise Chemistry, but to understand why it works.

On this channel, you’ll find:

• A-Level and O-Level Chemistry explanations
• Short, focused concept lessons
• Exam-style MCQs and worked questions
• Organic, Physical and Inorganic Chemistry
• Common mistakes and misconceptions explained clearly

I’m David Tan, a Singapore-based Chemistry tutor and published author. I break each topic down to its essential idea before gradually building towards the full explanation and exam-level application.

For tuition enquiries, Chemistry books and free learning resources, explore the links below.

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4:45

How to Predict Products of Aqueous Electrolysis | O-Level Chemistry

David Tan Chemistry

Shared 2 weeks ago

14 views

4:22

Electrolysis of Aqueous Sodium Chloride | Competition for Discharge Explained

David Tan Chemistry

Shared 2 weeks ago

35 views

3:10

Electrolysis of Molten Lead(II) Bromide | Half-Equations Explained

David Tan Chemistry

Shared 2 weeks ago

31 views

3:10

Anode vs Cathode in Electrolysis | Oxidation and Reduction Explained

David Tan Chemistry

Shared 2 weeks ago

76 views

2:15

What Is Electrolysis? | Ions, Electrons, Anode and Cathode Explained

David Tan Chemistry

Shared 2 weeks ago

78 views

3:02

Giant Covalent Structures Explained | Diamond, Graphite and Silicon Dioxide

David Tan Chemistry

Shared 3 weeks ago

16 views

2:45

Why Do Simple Molecular Substances Have Low Melting Points?

David Tan Chemistry

Shared 3 weeks ago

17 views

2:39

Why Do Metals Conduct Electricity? | Delocalised Electrons Explained

David Tan Chemistry

Shared 3 weeks ago

28 views

2:46

What Is Metallic Bonding? | Delocalised Electrons Explained

David Tan Chemistry

Shared 3 weeks ago

15 views

2:53

Why Does Sodium Chloride Conduct Electricity? | Solid vs Molten vs Aqueous NaCl

David Tan Chemistry

Shared 3 weeks ago

41 views

3:27

Why Is Astatine So Rare? The Element Almost No One Has Ever Seen

David Tan Chemistry

Shared 3 weeks ago

25 views

2:52

What Is Covalent Bonding? | Electron Sharing Explained

David Tan Chemistry

Shared 3 weeks ago

81 views

2:50

Ionic Bonding Explained | Electron Transfer and Opposite Ions

David Tan Chemistry

Shared 4 weeks ago

26 views

2:47

What Are Ions? | Positive and Negative Ions Explained for O-Level Chemistry

David Tan Chemistry

Shared 4 weeks ago

28 views

3:01

Protons, Neutrons and Electrons Explained | Atomic Structure for O-Level Chemistry

David Tan Chemistry

Shared 4 weeks ago

58 views

2:38

What Is an Atom? | Atomic Structure Explained for O-Level Chemistry

David Tan Chemistry

Shared 1 month ago

42 views

1:59

Percentage Purity Made Easy | Pure Reactant in an Impure Sample

David Tan Chemistry

Shared 1 month ago

15 views

1:42

Percentage Yield Made Easy | Actual Product vs Theoretical Product

David Tan Chemistry

Shared 1 month ago

27 views

2:52

Are We Drinking Plastic? Microplastics in Bottled Water Explained

David Tan Chemistry

Shared 1 month ago

53 views

1:36

Limiting Reagent Made Easy | The Reactant That Runs Out First

David Tan Chemistry

Shared 1 month ago

22 views

1:35

How to Read Mole Ratios from Balanced Equations | Stoichiometry Explained

David Tan Chemistry

Shared 1 month ago

70 views

1:36

Moles from Gas Volume Made Easy | n = V / 24 Explained

David Tan Chemistry

Shared 1 month ago

18 views

1:51

Calculate Moles from Concentration and Volume | n = cV Explained

David Tan Chemistry

Shared 1 month ago

27 views

1:35

Moles from Mass Made Easy | n = m/Mr Explained

David Tan Chemistry

Shared 1 month ago

20 views

2:08

What Is a Mole in Chemistry? | Mole Concept Explained Clearly

David Tan Chemistry

Shared 1 month ago

23 views

9:39

How to Interpret Proton NMR Spectra Step by Step | A-Level Chemistry

David Tan Chemistry

Shared 2 months ago

156 views

6:41

Born-Haber Cycle Explained Without Memorising the Diagram

David Tan Chemistry

Shared 2 months ago

205 views

10:55

Degree of Unsaturation Explained | Rings, Double Bonds and Triple Bonds

David Tan Chemistry

Shared 2 months ago

48 views

7:44

How Many Hydrogens Does Each NMR Peak Represent? | Proton NMR Integration

David Tan Chemistry

Shared 2 months ago

38 views

9:57

Why Proton NMR Peaks Split | n+1 Rule Explained for A-Level Chemistry

David Tan Chemistry

Shared 3 months ago

79 views

5:33

Isotopes Explained | Same Protons, Different Neutrons | A Level Chemistry

David Tan Chemistry

Shared 3 months ago

144 views

6:51

Structure of the Atom | Subatomic Particles, Relative Mass, Relative Charge & Electric Field

David Tan Chemistry

Shared 3 months ago

38 views

7:16

How to Balance Redox Half Equations in Alkaline Solution

David Tan Chemistry

Shared 4 months ago

21 views

5:36

How to Balance Redox Half Equations in Acidic Solution

David Tan Chemistry

Shared 4 months ago

12 views

10:38

Chemical Shift in Proton NMR | Shielding, Deshielding, Upfield and Downfield

David Tan Chemistry

Shared 4 months ago

196 views

4:00

When CH₂ Hydrogens Are Not Equivalent | ¹H NMR Stereocenter Exception

David Tan Chemistry

Shared 4 months ago

10 views

7:26

Equivalent vs Non-Equivalent Protons in ¹H NMR | Alkene Cis-Trans Exception Explained

David Tan Chemistry

Shared 4 months ago

75 views

8:40

Equivalent and Non-Equivalent Protons in Proton NMR | How to Count NMR Peaks

David Tan Chemistry

Shared 4 months ago

264 views

6:03

Introduction to Proton NMR Spectroscopy | Chemical Shift, Upfield, Downfield & Number of Peaks

David Tan Chemistry

Shared 4 months ago

130 views

4:22

Why Does Chlorine Bleach Damp Litmus Paper? | Chlorine Gas Test Explained | Chemistry

David Tan Chemistry

Shared 4 months ago

51 views

4:26

Why Does Oxygen Relight a Glowing Splint? | Oxygen Gas Test Explained | Chemistry

David Tan Chemistry

Shared 4 months ago

170 views

2:59

Why Does CO₂ Turn Limewater Milky? (And Why It Turns Clear Again) | Chemistry

David Tan Chemistry

Shared 5 months ago

122 views

10:16

How to Convert Gas Volume to Moles | Mole Concept | O-Level Chemistry

David Tan Chemistry

Shared 5 months ago

8 views

5:31

2026 UAS Calculator Singapore | How to Calculate Your A-Level UAS (70-Point System)

David Tan Chemistry

Shared 5 months ago

41 views

3:57

How to Convert Mass to Moles | Mole Concept | O-Level Chemistry

David Tan Chemistry

Shared 5 months ago

9 views