How to build a Chemistry formula sheet that sticks

Most students make a formula sheet the way they highlight a textbook: they copy everything out neatly, feel productive, and then never look at it again. A formula sheet only earns its place if the formulae end up in your head, not just on the paper. This guide shows you what to put on an SPM Chemistry formula sheet, how to organise it so it makes sense, and, most importantly, how to revise from it so the formulae actually stick.

Why a formula sheet is worth the effort

SPM Chemistry rewards students who can pick the right equation quickly under time pressure. In Paper 1, Paper 1 is an objective (multiple-choice) paper, you cannot afford to stall on a calculation. The act of building the sheet yourself, deciding what matters and writing it in your own words, is already half the learning, which is why copying a friend’s sheet, or printing one off the internet, does almost nothing. The sheet is a by-product; the thinking that makes it is the point.

The core calculations to include

Keep it tight. A good sheet is one page of the equations you actually use, not a copy of the syllabus. For SPM Chemistry the essentials are:

• Moles from mass: number of moles = mass / molar mass. Molar mass is the sum of the relative atomic masses, in grams per mole.
• Moles from concentration: number of moles = molarity × volume (with volume in dm³). This is the backbone of every titration question.
• Moles of a gas: number of moles = volume / molar volume. Remember the molar volume: 24 dm³ mol⁻¹ dm³ mol⁻¹ at room conditions, and 22.4 dm³ mol⁻¹ dm³ mol⁻¹ at STP.
• Number of particles: number of particles = number of moles × the Avogadro constant, 6.02 x 10²³ mol⁻¹.
• Concentration conversion: concentration in g dm⁻³ = concentration in mol dm⁻³ × molar mass.
• Dilution: M1V1 = M2V2, for diluting a stock solution.
• Percentage yield: (actual yield / theoretical yield) × 100, to express it as a percentage.
• Percentage purity: (mass of pure substance / mass of sample) × 100.
• Heat change: heat released or absorbed = mass × specific heat capacity × temperature change (often written Q = mcθ).
• Heat of reaction per mole: heat change / number of moles.
• Average rate of reaction: change in quantity of reactant or product / time taken.

If you want to check any of these worked out step by step, our Chemistry calculations hub sets out each one with examples, and the mole calculator lets you test your own numbers against a correct answer.

Organise by the quantity you are solving for

The mistake most students make is listing formulae by chapter, which is useless in the exam because the question does not tell you which chapter it belongs to. Organise your sheet by what you are trying to find. Group all the routes to “number of moles” together, from mass, from concentration and volume, from gas volume, from number of particles, because a huge proportion of Chemistry problems come down to finding moles first and then converting. When your sheet mirrors how you actually think through a problem (“what am I solving for, and what do I know?”), it becomes a thinking tool rather than a wall of symbols.

Make every formula mean something

Do not just write the symbols; write, in a few words, what each one is for and a trap to avoid. Next to the gas formula, note “volume must be in dm³, not cm³, divide cm³ by 1000.” Next to concentration, note “molarity is mol dm⁻³; do not confuse it with g dm⁻³.” These little annotations are where the marks are won and lost, because in SPM most calculation errors are unit slips and confused quantities, not arithmetic. A formula you understand is remembered; a formula you merely copied is forgotten.

How to make it stick: active recall

Here is the part almost everyone skips. Once the sheet exists, do not re-read it, that feels like studying but teaches little. Instead, test yourself:

1. Read the sheet once, carefully.
2. Turn it face down and write out every formula you can remember on a blank page.
3. Flip it back and check what you missed.
4. Repeat, focusing on the gaps.

This “blank page” method, reproducing the sheet from memory, is far more powerful than reading it ten times, because retrieving a fact is what strengthens the memory of it. Do this for a few minutes, two or three times a week, and within a fortnight the whole sheet lives in your head. Pair it with actually using the formulae on past-paper questions, so recall and application train together.

Keep it alive

A formula sheet is not a one-time craft project; it is a living document. Every time a question catches you out, a formula you forgot, a unit trap you fell for, add a note to the sheet. Over a term it becomes a personalised map of exactly the mistakes you tend to make, which is worth more than any generic printout. Keep the technical terms straight as you go using the Chemistry glossary, so the words on your sheet mean precisely what the exam expects. Build it yourself, organise it by what you are solving for, understand every line, and drill it with active recall, do that, and the sheet will not just sit in your file, it will sit in your memory when the paper is in front of you.