Is this Class 9 Science worksheet on Atoms and Molecules free?

Yes — it is completely free, with no login and no ads. You can print it or save it as a PDF, and generate unlimited variations.

Does the Atoms and Molecules worksheet come with answers?

Yes. Every worksheet has a separate answer key with the correct answers, short explanations and marks, so it is ready for marking.

Can I choose how many questions and which types?

Yes. Open the generator for this chapter and set how many MCQs, short, long and HOTS questions you want; totals and marks update live, and you can swap any single question.

Which board and class is this for?

This worksheet is aligned to CBSE Class 9 Science, chapter “Atoms and Molecules”.

🧾 CBSE · Class 9

Class 9 Science: Atoms and Molecules Worksheet (with Answers)

A free, print-ready worksheet on Atoms and Molecules for CBSE Class 9 Science, with a matching answer key. Use the sample below, or build your own with the exact mix of questions you need — no login, no ads.

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Sample worksheet

7 of 18 questions from this chapter. Generate your own for the full set, more variations, and a clean print layout.

1. Mass is neither created nor destroyed in a reaction — this is the law of:
- (a) multiple proportions
- (b) constant proportions
- (c) conservation of mass
- (d) Avogadro
2. The smallest particle of an element is a/an:
- (a) compound
- (b) ion
- (c) molecule
- (d) atom
3. A charged particle formed by losing or gaining electrons is a/an:
- (a) molecule
- (b) isotope
- (c) ion
- (d) atom
4. One mole of a substance contains how many particles?
- (a) 6.022 × 10²⁴
- (b) 3.011 × 10²³
- (c) 6.022 × 10²³
- (d) 6.022 × 10²²
5. State the law of constant proportions.
6. What is the value of Avogadro number?
7. State the postulates of Dalton's atomic theory.

View answers

1. (c) conservation of mass — It is the law of conservation of mass.
2. (d) atom — An atom is the smallest particle of an element.
3. (c) ion — Such a charged particle is an ion.
4. (c) 6.022 × 10²³ — Avogadro number is 6.022 × 10²³.
5. A pure compound always contains the same elements combined in the same fixed ratio by mass.
6. 6.022 × 10²³ particles per mole.
7. All matter is made of tiny indivisible atoms; atoms of a given element are identical in mass and properties; atoms of different elements differ; atoms combine in small whole-number ratios to form compounds; and atoms are neither created nor destroyed in a chemical reaction.

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How it works

Every question is drawn from StudyMatic’s own Science bank for Atoms and Molecules — nothing is auto-generated or invented. Pick how many of each type you want, add your own questions if you like, choose 1–4 paper sets for anti-cheating, and print the worksheet and answer key separately or save them as PDF.

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FAQ

Is this Class 9 Science worksheet on Atoms and Molecules free?: Yes — it is completely free, with no login and no ads. You can print it or save it as a PDF, and generate unlimited variations.
Does the Atoms and Molecules worksheet come with answers?: Yes. Every worksheet has a separate answer key with the correct answers, short explanations and marks, so it is ready for marking.
Can I choose how many questions and which types?: Yes. Open the generator for this chapter and set how many MCQs, short, long and HOTS questions you want; totals and marks update live, and you can swap any single question.
Which board and class is this for?: This worksheet is aligned to CBSE Class 9 Science, chapter “Atoms and Molecules”.