Atoms and Molecules · Class 9 Science · Chapter 3
🔬 Atoms and Molecules
CBSE Class 9 Science · Science · Chapter 1
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📖Notes Deck
Full lecture deck with teaching paragraphs, misconception red-boxes, and glossary. Read this first.
Download PDF →📝Quick Drill
15 pattern-tagged MCQs with per-Q time budget. Drill under a 20-min timer.
Download PDF →📄Exam Paper
Full exam-pattern paper with sections. Sit it closed-book before checking the marking scheme.
Download PDF →✅Marking Scheme + Topper Templates
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Download PDF →⚡Cheat Sheet
1-page exam-day card: key points, top question patterns, 90-minute revision flow.
Download PDF →👨👩👧For Parents
1-page plain-language parent guide: what's being learned + questions to ask your child.
Download PDF →Top question patterns · CBSE annual / SQP aggregate
| 88% | Mole calculation — given mass, find number of moles, atoms or molecules — Write n = m/M. Compute molar mass. Multiply by N_A for particles. Show all three steps with units. | 3 MARKS |
| 80% | Molecular / formula unit mass calculation of a given compound — List atomic masses, multiply by number of atoms, sum. Always quote atomic masses you used. | 2 MARKS |
| 72% | Law of Conservation of Mass — state + verify with numerical example — State the law + add reactant masses + add product masses + show equality. | 3 MARKS |
| 65% | Write chemical formulae using valencies (4-5 compounds asked) — Criss-cross method. Polyatomic ions go in brackets when subscript >1: Ca(NO₃)₂. | 2 MARKS |
| 55% | Postulates and limitations of Dalton's atomic theory — Any 3 postulates (1 mark) + any 2 limitations (1.5 marks) + how modern theory accounts for them (0.5 mark). | 3 MARKS |
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