How to explain chemistry to yourself to learn it

There is a moment every SPM Chemistry student knows: you read the explanation, it makes perfect sense, you move on, and a week later you cannot reproduce a word of it. Understanding while you read is not the same as owning an idea. The gap between the two is where marks are lost, and the fastest way to close it is deceptively simple: teach the topic to yourself, out loud, as if explaining it to someone who has never met it.

Why explaining beats reviewing

When you explain something, you cannot hide behind the textbook’s wording. You have to put the idea into your own words, in the right order, with the causes and effects joined up. The instant you reach a step you only half-understand, your explanation stalls. That stall is priceless. It is the exact spot your revision needs to go, and no amount of quiet re-reading would ever have revealed it.

This is sometimes called the Feynman technique, after the physicist who insisted that if you cannot explain something plainly, you do not really understand it. It works because it turns a passive idea into an active performance. And performing an explanation is far closer to what Paper 2 asks of you, “explain why,” “describe how”, than nodding along to a model answer ever is.

The four-step self-explanation loop

1. Pick one idea and say it aloud in plain words. Choose something specific: why a giant covalent structure like silicon dioxide has a high melting point, or why the rate of reaction falls as a reaction proceeds. Explain it out loud as if to a Form 3 student, using no jargon you cannot define.

2. Notice where you go vague. The moment you say “and then it just reacts” or “because of the electrons somehow,” stop. You have found the gap. Mark it.

3. Go back to the source and fix only that gap. Return to your notes, our glossary, or the relevant chapter, for organic routes, the carbon compounds page, and find the precise reason. For the rate example, the honest answer is: as reactant is used up, its concentration falls, so particles collide less frequently, so the rate drops until a reactant runs out.

4. Explain it again, cleanly, start to finish. This time the explanation should flow without stalling. If it stalls somewhere new, loop again. Two or three passes usually turn a fuzzy topic into one you could teach.

Ask yourself “why” and “how,” not just “what”

Weak revision collects facts; strong revision connects them. As you explain, keep interrogating your own statements:

• You say ionic compounds conduct electricity when molten. Why? Because the ions become free to move and carry charge, which they cannot do in the solid.
• You say adding a catalyst speeds up a reaction. How? It provides an alternative path with lower activation energy, so a larger fraction of collisions are successful.
• You say a stronger acid has a lower pH. Why? Because it ionises more completely in water, giving a higher concentration of hydrogen ions, H⁺.

Each “why” you can answer is understanding you actually own. Each one you cannot is a target for tonight.

Explain onto paper, then check the wording

Talking exposes gaps; writing sharpens phrasing. After you can say an idea cleanly, write the explanation as you would in the exam, then compare it against exam-safe wording. Chemistry rewards precise language, “ionises completely in water,” “particles collide with energy greater than the activation energy”, and self-explanation in your own loose words is the first draft, not the final answer. Tighten the keywords afterwards so your understanding and your mark match.

A quick worked example

Take electrolysis of molten lead(II) bromide. Explain it aloud: “The compound is heated until molten so the ions are free to move. At the cathode, lead(II) ions gain electrons and are reduced to lead metal; at the anode, bromide ions lose electrons and are oxidised to bromine.” If you stumbled on which electrode is which, or on the word “reduced,” you have just found precisely what to revise, and you found it in ninety seconds, not on results day.

Where a teacher makes explaining safer

The weakness of explaining to yourself is that you cannot always tell a confident-sounding wrong answer from a right one. In our online one-to-one lessons, our experienced SPM Chemistry teachers ask you to explain a topic back, then gently press on the exact step where your reasoning bends, the difference between “conducts because of electrons” and the answer that scores. Lessons run in English from RM50 an hour, with a paid one-hour trial so you can test the method on a chapter you find slippery. See how it works if you would like to try explaining a topic to a teacher who knows where it usually breaks.