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ICSE Class 7 Chemistry Question 11 of 11

Language of Chemistry — Question 11

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Question 11

Give word equations for the following chemical reactions and give the names of the products formed.

(a) Zn + 2HCl ⟶ ZnCl2 + H2

(b) CuO + H2SO4 ⟶ CuSO4 + H2O

(c) Zn + S ⟶ ZnS

(d) ZnCO3 →Δ\xrightarrow{\Delta} ZnO + CO2

(e) NH3 + HCl ⟶ NH4Cl

Answer

(a) Zinc + dilute Hydrochloric acid ⟶ Zinc chloride + Hydrogen
The products formed are zinc chloride and hydrogen.

(b) Copper (II) oxide + Sulphuric Acid ⟶ Copper (II) sulphate + water
The products formed are Copper (II) sulphate and water

(c) Zinc + Sulphur ⟶ Zinc Sulphide
The product formed is Zinc Sulphide.

(d) Zinc carbonate ⟶ Zinc oxide + Carbon dioxide
The products formed are Zinc oxide and Carbon dioxide

(e) Ammonia + Hydrogen chloride ⟶ Ammonium chloride
The product formed is Ammonium chloride.

ICSE Class VII Chemistry Chapter 4 12 Marks

Language of Chemistry — Quick Study Guide

Chemical symbols, formulae, and equations are the language chemists use to describe substances and reactions.

Key Concepts

  • Chemical symbol: Shorthand for an element (first letter capital, second lowercase)
  • Chemical formula: Shows types and numbers of atoms in a molecule
  • Cross-multiplication: Write symbols → valencies → cross → simplify
  • Balanced equation: Same number of each atom on both sides
  • Combination reaction: A + B → AB
  • Decomposition reaction: AB → A + B

Latin-Origin Symbols to Memorise

Na (Sodium), Fe (Iron), Au (Gold), Ag (Silver), K (Potassium), Cu (Copper), Hg (Mercury), Pb (Lead), Sn (Tin)

Exam Tips

  • Never change subscripts when balancing — only change coefficients
  • Use brackets for polyatomic ions when subscript > 1
  • Practice writing formulae using cross-multiplication daily
  • CO ≠ Co (carbon monoxide vs cobalt)

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