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Formula Sheet

The Language of Chemistry

ICSE · Class 9 · Chemistry

All formulas from The Language of Chemistry in ICSE Class 9 Chemistry. Key equations, constants, and identities for board exam preparation.

44 questions30 flashcards5 concepts

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An infographic comparing elements, molecules, and compounds, showing how atoms combine to form different types of substances. Includes examples of monoatomic, diatomic, and polyatomic elements, and si
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17 Formulas · 4 Sections

Formulas

Symbols, Formulas, and Molecules

A symbol represents one atom of an element

Chemical formula = symbols of elements with subscripts

Molecular formula of water = H2O

Molecular formula of ammonia = NH3

Molecular formula of sodium carbonate = Na2CO3

Valency and Radicals

Valency = combining capacity of an atom or radical

Valency from outer electrons: 1→1, 2→2, 3→3, 4→4, 5→3, 6→2, 7→1, 8→0

Variable valency naming: lower = ous, higher = ic

Writing Chemical Formulae

Criss-cross method

Formula of magnesium chloride = MgCl2

Formula of aluminium hydroxide = Al(OH)3

Formula of ammonium sulphate = (NH4)2SO4

Naming Compounds and Acids

Metal + non-metal: name metal first, add ide to non-metal

Two non-metals: use prefixes tri, tetra, penta, etc.

Oxo-salt naming: hypo- for less than 2 oxygen, ite for 2, ate for 3, per- for more than 3

Binary acids: hydro + second element + ic acid

Acids with polyatomic radicals do not use hydro

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Frequently Asked Questions

What are the important topics in The Language of Chemistry for ICSE Class 9 Chemistry?
Key topics in The Language of Chemistry include How to Write a Chemical Formula Using the Criss-Cross Method (With Common Mistake Warnings), The Language of Chemistry — Complete Concept Map, The Language of Chemistry — Key Concepts Overview. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in The Language of Chemistry — ICSE Class 9 Chemistry?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for The Language of Chemistry

All 9 chapters — ICSE Class 9 Chemistry Formula Sheet

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