S2.4 From models to materials

S2.4 From models to materials Quiz

IB Chemistry SL: Quiz

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5 questions, one answer each

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  1. 1. Which compound has the smallest electronegativity difference? (Na 0.9, Cl 3.2, Mg 1.3, O 3.4, C 2.6, H 2.2, K 0.8, F 4.0)

    • A. NaCl
    • B. MgO
    • C. CH₄
    • D. KF

  2. 2. Which is the repeating unit of poly(tetrafluoroethene)?

    • A. –[CF₂=CF₂]–
    • B. –[CF₂–CF₂]–
    • C. –[CHF–CHF]–
    • D. –[CF–CF]–

  3. 3. Why is brass harder than pure copper?

    • A. Zinc forms covalent bonds with copper
    • B. Zinc atoms of a different size disrupt the layers of copper cations
    • C. Brass has no delocalised electrons
    • D. Zinc makes the bonding directional

  4. 4. Why do plastics soften at relatively low temperatures?

    • A. The C–C bonds in the chains break
    • B. Only weak intermolecular forces hold the chains together
    • C. They contain delocalised electrons
    • D. They are ionic

  5. 5. A compound has average EN 2.0 and ΔEN 2.4. Which property is predicted?

    • A. Conducts as a solid
    • B. Conducts when molten
    • C. Malleable
    • D. Low melting point

Quiz