Videos
IGCSE Chemistry
Pick a topic to watch.
12 video lessons
13:32
Topic 1
States of Matter
Sit in a room while someone makes coffee next door. Soon you can smell it, even from across the room. How? Everything around you is made of tiny particles, far…
16:42
Topic 2
Atoms & Bonding
Look at these two things. A diamond — the hardest material you can buy. And the soft, grey lead in a pencil. They could not seem more different. Yet both are…
15:33
Topic 3
Stoichiometry
Here is a chemist's problem. A single atom is far too small to see, and there are billions upon billions in the tiniest speck. So how do you count them? You…
10:25
Topic 4
Electrolysis
Electricity can do something amazing: it can tear a compound apart. Pass a current through a melted or dissolved compound, and it splits into its elements.…
5:51
Topic 5
Energetics
Snap a glow stick, and it lights up. Hold a hand-warmer, and it gets hot. Open an instant cold pack, and it turns icy. In every case, a chemical reaction is…
15:53
Topic 6
Rates & Equilibrium
Milk on the counter spoils in a day. In the fridge, it lasts a week. Same milk — but the reaction runs at a different speed. First, a quick check: a chemical…
13:06
Topic 7
Acids, Bases & Salts
Lemon juice, vinegar, and the acid in your stomach — acids are everywhere. So are their opposites: alkalis, like soap and oven cleaner. Mix an acid and an…
11:15
Topic 8
The Periodic Table
This is the most powerful chart in all of chemistry: the Periodic Table. It looks like a jumble of boxes, but it hides a beautiful secret. The elements are…
13:43
Topic 9
Metals
Why do we dig gold out of the ground as shiny nuggets, but iron only as dull, rusty rock? And why does a soda can never rust, while an iron nail does? The…
10:36
Topic 10
Chemistry of the Environment
Look at a glass of water, and the air in this room. Both look clean and simple. But natural water carries dissolved oxygen, minerals, and sometimes sewage and…
16:50
Topic 11
Organic Chemistry
Petrol, plastic bottles, vinegar, alcohol, and the proteins in your body. They seem completely unrelated. But every one of them is built from carbon. Carbon is…
13:26
Topic 12
Experimental Techniques
You are handed an unknown white powder and a colourless solution. No labels. How do you find out what they are? Chemistry gives you a detective's toolkit: add…