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Giant Structures (CIE IGCSE Chemistry: Co-ordinated Sciences (Double Award))

Exam Questions

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Giant Structures

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Giant Structures

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11 mark

The structures of two solids X and Y are shown below.

q1-2-4-mcq-easy-cie-igcse-che

What are the correct uses of these structures?

  X Y
A industrial lubricating glass cutters
B industrial lubricating industrial lubricating
C glass cutters industrial lubricating
D glass cutters glass cutters

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    21 mark

    Graphite is used extensively as a lubricating material. It is also used in pencils and in the manufacture of electrodes for electrolysis.

    Which row describes how graphite can be used in electrolysis?

      property use
    A delocalised electrons conducts electricity
    B delocalised electrons acts as an insulator
    C low melting point acts as an insulator
    D low melting point conducts electricity

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      31 mark

      Graphite is used to produce electrodes due to its ability to conduct electricity.

      What other property does graphite have that makes it useful for this application?

      • Graphite is an unreactive substance and doesn’t react with the electrolyte.

      • Graphite is soft and easy to shape into electrodes.

      • Graphite has a low melting point due to the weak forces in between the layers.

      • Graphite dissolves readily in water.

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      41 mark

      Extended tier only

      Which statement correctly describes the bonding in metals?

      • A lattice of negative ions in a “sea of electrons”.

      • A lattice of positive ions in a “sea of electrons”.

      • A lattice of neutral atoms with delocalised electrons.

      • A lattice of negative ions with delocalised electrons.

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      51 mark

      Extended tier only

      Which row provides a correct description of the properties of metals?

        melting point boiling point conducts electricity
      A high low cross times
      B low high ✓
      C low low cross times
      D high high ✓

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        11 mark

        Which of the following statements about graphite and diamond are incorrect?

        1 They are allotropes of carbon.
        2 They both conduct electricity.
        3 They form different numbers of bonds within their structures.
        4 They have different uses.

        • 2 and 3

        • 2 only

        • 1, 3 and 4

        • 2 and 4

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        21 mark

        Which statement correctly describes the structure of macromolecules?

        • Giant molecular crystal which is held together by weak intermolecular forces.

        • Giant molecular crystal which is held together by strong ionic bonds.

        • Giant molecular crystal which is held together by weak metallic bonds.

        • Giant molecular crystal which is held together by strong covalent bonds.

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        31 mark

        Which statement about graphite and diamond is not correct?

        • Graphite is a good lubricant due to the weak forces in between the layers.

        • Diamond is used as a drill tip because it is an extremely hard substance.

        • Graphite has a low melting point due to the weak forces in between the layers.

        • Diamond is an allotrope of carbon.

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        41 mark

        Statements 1, 2 and 3 are about diamond and graphite.

        1   They have atoms that form three equally strong bonds 

        2   They each conduct electricity 

        3   They are both formed from the same element 

        Which statements are not correct? 

        • 1 only

        • 2 only

        • 1 and 3 

        • 1 and 2

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        11 mark

        Extended tier only

        Metallic bonds are very strong and give metals their properties. Which of the following definitions is correct for a metallic bond?

        • A metallic bond is formed by the electrostatic attraction that occurs due to electron transfer between metal atoms.

        • A metallic bond is formed by the electrostatic attraction between the positive ions and the delocalised electrons.

        • A metallic bond is formed by the electrostatic attraction that occurs due to the uneven sharing of electrons between metal atoms.

        • A metallic bond is formed by the intermolecular forces between the positive metal ions and the delocalised electrons.

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        21 mark

        Extended tier only

        Metals are malleable and ductile and can be hammered and pulled into useful shapes.

        Which statement correctly explains these properties?

        • Layers of atoms in the metal lattice are rigid and held strongly together so they cannot move.

        • Layers of atoms in a metal can slide over one another and break the attractive forces that hold them together.

        • Layers of atoms in a metal can slide over one another and new attractive forces are formed between the metal ions and the delocalised electrons.

        • Layers of atoms in a metal cannot slide over one another and the attractive forces between the metal ions and the delocalised electrons are unbreakable.

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