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ICSE Class 8 Language of Chemistry — practice questions

Explore 18 free Language of Chemistry questions in ICSE Class 8 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Language of Chemistry questions and exercises with answers

Showing questions 1–18 of 18.

Which is the correctly capitalised symbol for calcium?Read the answer and worked solution →What do 2H and H2 represent, respectively?Read the answer and worked solution →H2SO4 contains how many elements and atoms per molecule?Read the answer and worked solution →In Ca(OH)2, the oxygen and hydrogen atom counts are?Read the answer and worked solution →Three H2O molecules contain how many H and O atoms?Read the answer and worked solution →When balancing a fixed reaction, which numbers may be adjusted?Read the answer and worked solution →Mg has valency 2 and Cl has valency 1. Magnesium chloride is?Read the answer and worked solution →Mg and O each have valency 2. Their simplest compound formula is?Read the answer and worked solution →Valencies: Ca=2, hydroxide OH=1. Correct formula?Read the answer and worked solution →Magnesium + oxygen yields MgO. Choose the simplest balanced equation.Read the answer and worked solution →For N2 + H2 -> NH3, the least whole-number coefficients are?Read the answer and worked solution →2H2 + O2 -> 2H2O: three molecules become two. Why is mass conserved?Read the answer and worked solution →How is 4H2 + 2O2 -> 4H2O classified?Read the answer and worked solution →Complete: 2Na + 2H2O -> 2NaOH + ?Read the answer and worked solution →Which pair reacts as written in C + O2 -> CO2?Read the answer and worked solution →Which state-label mapping is correct in chemical equations?Read the answer and worked solution →Bare 2H2 + O2 -> 2H2O lacks conditions. What cannot be read from it?Read the answer and worked solution →What does + separate in H2 + Cl2 -> 2HCl?Read the answer and worked solution →

Worked practice questions

Which is the correctly capitalised symbol for calcium?

  1. CA, both letters capitalised
  2. Ca, with C capitalised
  3. cA, with A capitalised
  4. ca, both letters lowercase
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Correct answer: B. Ca, with C capitalised

An element symbol begins with a capital letter, followed by a lowercase letter when a second letter is present.

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What do 2H and H2 represent, respectively?

  1. Two atoms; one molecule
  2. Two molecules; one atom
  3. One molecule; two atoms
  4. One atom; two molecules
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Correct answer: A. Two atoms; one molecule

The coefficient counts two separate hydrogen atoms, while the subscript in H2 joins two atoms in one molecule.

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H2SO4 contains how many elements and atoms per molecule?

  1. 7 elements, 3 atoms
  2. 4 elements, 7 atoms
  3. 3 elements, 7 atoms
  4. 3 elements, 4 atoms
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Correct answer: C. 3 elements, 7 atoms

Hydrogen, sulfur and oxygen are three elements, and their atom counts add to 2+1+4=7.

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More Chemistry topics

Alcohols Phenols EthersAlkenesAtomic combinationsAtomsAtoms and ElementsAtoms and MoleculesChemical EquilibriumChemistry