Formulae

Formulae Quiz

Spec 3.1 · Cambridge IGCSE Chemistry: Quiz

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5 questions, one answer each

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  1. 1. What is the molecular formula of a compound?

    • A. The number and type of different atoms in one molecule
    • B. The simplest whole number ratio of atoms in a compound
    • C. The total mass of all atoms in a compound
    • D. The arrangement of atoms around a central nucleus

  2. 2. Which of the following is the correct formula for sodium chloride?

    • A. Na₂Cl
    • B. NaCl
    • C. NaCl₂
    • D. Na₃Cl

  3. 3. A compound contains 2 nitrogen atoms and 5 oxygen atoms per molecule. What is its molecular formula?

    • A. NO₂
    • B. N₂O₅
    • C. N₅O₂
    • D. NO₅

  4. 4. A hydrocarbon contains 6 carbon atoms and 12 hydrogen atoms. What is the empirical formula?

    • A. C₆H₁₂
    • B. CH₂
    • C. C₃H₆
    • D. C₂H₄

  5. 5. Magnesium reacts with oxygen to form magnesium oxide. Which symbol equation with correct state symbols represents this reaction?

    • A. Mg + O → MgO
    • B. 2Mg(s) + O₂(g) → 2MgO(s)
    • C. Mg(s) + O₂(s) → MgO(l)
    • D. 2Mg(g) + O₂(g) → 2MgO(g)

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