Official Class 8 Science Worksheets: Language of Chemistry
Access comprehensive chapter-wise worksheets for Language of Chemistry using the CBSE Class 8 Science Language of Chemistry Worksheet Set 04. Designed to align with the 2026-27 academic syllabus for Class 8 Science, these printable practice sets help students reinforce key concepts and improve their overall exam readiness.
Solved Practice Worksheets for Science
Access the complete worksheet PDF for Class 8 Science below. Regular practice with these targeted academic tasks builds familiarity with standard question patterns and helps secure higher marks in final school examinations.
A. Check Point
1. Write the symbols: calcium, chlorine, sodium, iodine, aluminium, mercury.
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Answer: Ca, Cl, Na, I, Al, Hg.
Teacher's Note: Mercury's symbol comes from its Latin name hydrargyrum.
2. The symbol of helium is He. What does it represent?
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Answer: It represents one atom of helium (and the element helium as a whole).
Teacher's Note: Give an example if the question allows.
3. The combining capacities of aluminium and oxygen in Al2O3.
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Answer: Aluminium has a combining capacity (valency) of 3 and oxygen has 2.
Teacher's Note: Write a short, clear answer.
4. What does the formula of a substance signify?
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Answer: It tells the name of the substance, the elements present in it, the number of atoms of each element in one molecule, and its molecular mass.
Teacher's Note: Remember this for your exam.
5. What are monoatomic and diatomic molecules?
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Answer: A monoatomic molecule has one atom, such as helium (He), neon (Ne) and argon (Ar). A diatomic molecule has two atoms, such as hydrogen (H2), oxygen (O2) and chlorine (Cl2).
Teacher's Note: Learn this point and write it in your own words.
6. Name the elements: K, Na, Pb, Ca, Zn, Sn, Br, Cl.
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Answer: Potassium, sodium, lead, calcium, zinc, tin, bromine, chlorine.
Teacher's Note: K, Na, Pb and Sn come from Latin names: kalium, natrium, plumbum and stannum.
B. Balanced Equations
7. Write balanced equations for the word equations.
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Answer: 1. 2KNO3 → 2KNO2 + O2
2. N2 + O2 → 2NO
3. C + 4HNO3 (conc.) → CO2 + 4NO2 + 2H2O
4. 2Fe + 3H2O (steam) → Fe2O3 + 3H2
5. (NH4)2CO3 → 2NH3 + CO2 + H2O
6. 2ZnS + 3O2 → 2ZnO + 2SO2
7. 2Na + 2H2O → 2NaOH + H2
8. CO2 + C → 2CO (the usual reaction that forms carbon monoxide from carbon dioxide)
9. 2Na3PO4 + 3Ca(NO3)2 → 6NaNO3 + Ca3(PO4)2
10. Zn + H2O (steam) → ZnO + H2
Teacher's Note: Count the atoms of each element on both sides to check that the equation is balanced.
C. Chemical Equations
1. What is a chemical equation?
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Answer: A chemical equation is the short way of writing a chemical reaction using the symbols and formulae of the reactants and products.
Teacher's Note: Write a short, clear answer.
2. Why must a chemical equation be balanced? Name the law.
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Answer: Atoms are neither created nor destroyed in a reaction, so the number of atoms of each element must be the same on both sides. This is the law of conservation of mass.
Teacher's Note: Remember this for your exam.
3. What is the principle of a chemical equation?
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Answer: It follows the law of conservation of mass: the total mass of the reactants equals the total mass of the products.
Teacher's Note: Learn this point and write it in your own words.
4. Write the valencies of the radicals, with signs: Mg, Ca, Na, Al, PO4, O, Cl, SO4, CO3.
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Answer:
| Radical | Valency |
|---|---|
| Mg | 2+ |
| Ca | 2+ |
| Na | 1+ |
| Al | 3+ |
| PO4 (phosphate) | 3- |
| O (oxide) | 2- |
| Cl (chloride) | 1- |
| SO4 (sulphate) | 2- |
| CO3 (carbonate) | 2- |
Teacher's Note: Use the key term in your answer.
D. Balance the Equations
12. Balance these equations.
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Answer: 1. 4Al + 3O2 → 2Al2O3
2. 2NaOH + H2SO4 → Na2SO4 + 2H2O
3. MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O
4. 2KClO3 → 2KCl + 3O2
5. 2KMnO4 + 16HCl → 2KCl + 2MnCl2 + 5Cl2 + 8H2O
Teacher's Note: Give an example if the question allows.
E. Keywords
13. Define: chemical formula, chemical equation, symbol, valency.
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Answer: Chemical formula: the short way of representing a molecule of a substance using symbols and numbers. Chemical equation: the short way of representing a chemical reaction. Symbol: a short form of the name of an element, such as Fe for iron. Valency: the combining capacity of an atom of an element.
Teacher's Note: Write a short, clear answer.
F. Exercise
(i) The symbol of nitrogen. (ii) The valency of hydrogen. (iii) The formula of sodium oxide. (iv) The principle involved in a chemical equation. (v) A limitation of a chemical equation.
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Answer: (i) (a) N; (ii) (a) 1; (iii) (b) Na2O; (iv) (a) law of conservation of mass; (v) (a) it does not tell the conditions of the reaction.
Teacher's Note: Remember this for your exam.
15. Fill in the blanks.
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Answer: 1. NaCl + HNO3 → HCl↑ + NaNO3
2. FeSO4 + 2NaOH → Fe(OH)2↓ + Na2SO4
3. Al2O3 + 6HCl → 2AlCl3 + 3H2O
4. MgO + H2SO4 → MgSO4 + H2O
5. 3KOH + FeCl3 → Fe(OH)3 + 3KCl
6. Pb(NO3)2 + Na2SO4 → PbSO4↓ + 2NaNO3
7. FeCl2 + 2NaOH → Fe(OH)2↓ + 2NaCl
8. NaCl + AgNO3 → AgCl↓ + NaNO3
9. CuO + 2HCl → CuCl2 + H2O
10. NaOH + HCl → NaCl + H2O
Teacher's Note: The arrows show a gas given off (up) and a precipitate formed (down).
16. True or False (rewrite the false statements): 1. Symbols were first used by the Swedish chemist John Dalton. 2. To study chemicals we need the fundamental building block, the molecule. 3. Chemical reactions always involve the input or release of energy. 4. The molecular formula of baking soda is Na2O3. 5. The law of constant proportion is involved in balancing a chemical equation.
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Answer: 1. False. The Swedish chemist Berzelius introduced the letter symbols (Dalton used circles). 2. False. The fundamental building block is the atom. 3. True. 4. False. The formula of baking soda is NaHCO3. 5. False. The law of conservation of mass is involved in balancing.
Teacher's Note: Use the key term in your answer.
1. What is a chemical equation? What information does it give? What are its limitations?
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Answer: It is the symbolic representation of a reaction. It tells the reactants and products, the number of atoms and molecules involved, and (by the arrows) gas or precipitate formation. Its limitations: it does not tell the speed of the reaction, the conditions needed (temperature, pressure, catalyst), whether heat is given out or taken in, or the concentration.
Teacher's Note: Give an example if the question allows.
2. How do we write a chemical formula? Give examples.
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Answer: Write the symbols of the elements, put the valency of each below the other symbol (criss-cross), and simplify. For example, for aluminium oxide: Al (3) and O (2) gives Al2O3; for sodium chloride: Na (1) and Cl (1) gives NaCl; for calcium chloride: Ca (2) and Cl (1) gives CaCl2.
Teacher's Note: Write a short, clear answer.
3. Write the formulae.
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Answer:
| Compound | Formula |
|---|---|
| Sodium carbonate | Na2CO3 |
| Ferric hydroxide | Fe(OH)3 |
| Magnesium phosphate | Mg3(PO4)2 |
| Mercuric oxide | HgO |
| Ferrous sulphide | FeS |
| Calcium oxide | CaO |
| Sodium hydrogen carbonate | NaHCO3 |
| Ammonium sulphate | (NH4)2SO4 |
| Aluminium chloride | AlCl3 |
| Zinc sulphate | ZnSO4 |
Teacher's Note: Remember this for your exam.
4. Explain: symbol, compound, chemical equation, limitations of a chemical equation, law of conservation of mass.
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Answer: Symbol: a short form of an element's name. Compound: a pure substance formed by the chemical combination of two or more elements in a fixed ratio. Chemical equation: a short representation of a chemical reaction. Limitations: it does not show the conditions, the rate, the heat change or the physical state unless written. Law of conservation of mass: mass can neither be created nor destroyed in a chemical reaction.
Teacher's Note: Learn this point and write it in your own words.
Free study material for Science
Free CBSE Practice Worksheets: Class 8 Science Language of Chemistry
Download Chapter Worksheets: Class 8 Science
Access structured practice worksheets for Language of Chemistry aligned with the 2026 CBSE curriculum. These downloadable exercises for Class 8 Science help students build accuracy and reinforce core concepts for upcoming school tests.
Concept Clarification for Language of Chemistry
Each worksheet draws directly from authorized standard textbooks to maintain academic accuracy. Evaluating your finished exercises against expert-verified solutions helps master the formal presentation standards expected in school evaluations.
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FAQs
You can download the latest chapter-wise printable worksheets for Class 8 Science Language of Chemistry for free from StudiesToday.com. These have been made as per the latest CBSE curriculum for this academic year.
Yes, Class 8 Science worksheets for Language of Chemistry focus on activity-based learning and also competency-style questions. This helps students to apply theoretical knowledge to practical scenarios.
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Yes, our Class 8 Science test sheets are mobile-friendly PDFs and can be printed by teachers for classroom.
For Language of Chemistry, regular practice with our worksheets will improve question-handling speed and help students understand all technical terms and diagrams.