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.

View channel on YouTube

Switch Invidious Instance

Videos

newest

oldest

popular

2:52

What Is Covalent Bonding? | Electron Sharing Explained

David Tan Chemistry

Shared 19 hours ago

6 views

2:50

Ionic Bonding Explained | Electron Transfer and Opposite Ions

David Tan Chemistry

Shared 2 days ago

3 views

2:47

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

David Tan Chemistry

Shared 3 days ago

7 views

3:01

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

David Tan Chemistry

Shared 4 days ago

25 views

2:38

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

David Tan Chemistry

Shared 5 days ago

23 views

1:59

Percentage Purity Made Easy | Pure Reactant in an Impure Sample

David Tan Chemistry

Shared 5 days ago

6 views

1:42

Percentage Yield Made Easy | Actual Product vs Theoretical Product

David Tan Chemistry

Shared 6 days ago

14 views

2:52

Are We Drinking Plastic? Microplastics in Bottled Water Explained

David Tan Chemistry

Shared 1 week ago

27 views

1:36

Limiting Reagent Made Easy | The Reactant That Runs Out First

David Tan Chemistry

Shared 1 week ago

21 views

1:35

How to Read Mole Ratios from Balanced Equations | Stoichiometry Explained

David Tan Chemistry

Shared 1 week ago

62 views

1:36

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

David Tan Chemistry

Shared 1 week ago

14 views

1:51

Calculate Moles from Concentration and Volume | n = cV Explained

David Tan Chemistry

Shared 1 week ago

20 views

1:35

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

David Tan Chemistry

Shared 1 week ago

15 views

2:08

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

David Tan Chemistry

Shared 1 week ago

18 views

9:39

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

David Tan Chemistry

Shared 1 month ago

109 views

6:41

Born-Haber Cycle Explained Without Memorising the Diagram

David Tan Chemistry

Shared 1 month ago

115 views

10:55

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

David Tan Chemistry

Shared 1 month ago

34 views

7:44

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

David Tan Chemistry

Shared 1 month ago

29 views

9:57

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

David Tan Chemistry

Shared 2 months ago

75 views

5:33

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

David Tan Chemistry

Shared 2 months ago

117 views

6:51

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

David Tan Chemistry

Shared 2 months ago

37 views

7:16

How to Balance Redox Half Equations in Alkaline Solution

David Tan Chemistry

Shared 3 months ago

17 views

5:36

How to Balance Redox Half Equations in Acidic Solution

David Tan Chemistry

Shared 3 months ago

11 views

10:38

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

David Tan Chemistry

Shared 3 months ago

166 views

4:00

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

David Tan Chemistry

Shared 3 months ago

10 views

7:26

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

David Tan Chemistry

Shared 3 months ago

61 views

8:40

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

David Tan Chemistry

Shared 3 months ago

233 views

6:03

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

David Tan Chemistry

Shared 3 months ago

122 views

4:22

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

David Tan Chemistry

Shared 4 months ago

45 views

4:26

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

David Tan Chemistry

Shared 4 months ago

156 views

2:59

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

David Tan Chemistry

Shared 4 months ago

63 views

10:16

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

David Tan Chemistry

Shared 4 months ago

8 views

5:31

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

David Tan Chemistry

Shared 4 months ago

37 views

3:57

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

David Tan Chemistry

Shared 4 months ago

9 views