Intermolecular forces and physical properties

Intermolecular forces and physical properties Quiz

Spec 7.5 · Edexcel International A Level Chemistry: Quiz

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5 questions, one answer each

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  1. 1. Why does the boiling temperature of straight-chain alkanes increase from ethane to hexane?

    • A. The C–C bonds get stronger
    • B. Hydrogen bonds form between the molecules
    • C. More electrons per molecule give stronger London forces
    • D. The molecules become polar

  2. 2. Which has the higher boiling temperature, hexane or 2,2-dimethylbutane, and why?

    • A. Hexane, because unbranched molecules have more surface contact
    • B. 2,2-Dimethylbutane, because it has more branches
    • C. Hexane, because it has more electrons
    • D. 2,2-Dimethylbutane, because its molecules are more polar

  3. 3. Ethane and methanol have the same number of electrons. Why is the boiling temperature of methanol higher?

    • A. Methanol forms hydrogen bonds
    • B. Methanol has stronger London forces
    • C. The C–O bond is stronger than the C–C bond
    • D. Methanol has more carbon atoms

  4. 4. Which hydrogen halide has the highest boiling temperature?

    • A. HCl
    • B. HBr
    • C. HI
    • D. HF

  5. 5. Why does HI have a higher boiling temperature than HCl?

    • A. HI forms hydrogen bonds
    • B. The H–I bond is stronger than the H–Cl bond
    • C. HI has more electrons so stronger London forces
    • D. HI is more polar than HCl

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