O LevelChemistryCambridgeExam Questions2. Atoms, Elements & Compounds2.6 Giant Covalent Structures

Giant Covalent Structures (Cambridge O Level Chemistry)

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2.6 Giant Covalent Structures

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2.6 Giant Covalent 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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      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

      The following statements describe the structure and properties of silicon(IV) oxide.

      1. Giant covalent structure held together by many strong covalent bonds.
      2. It is a very hard substance.

      Which of the following is correct for statements 1 and 2?

      • Statement 2 is correct but statement 1 is incorrect.

      • Both statements are incorrect.

      • Both are correct and statement 1 explains statement 2.

      • Both are correct and statement 2 explains statement 1.

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      51 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 incorrect? 

      • 1 only

      • 2 only

      • 1 and 3 

      • 1 and 2

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      61 mark

      The diagrams show the structures of two solids, P and Q.

      q7-cie-o-level-chemistry-june-2021-paper-1

      Which row is correct?

       

      has covalent bonding

      conducts electricity

      A

      P only

      P only

      B

      P only

      Q only

      C

      both P and Q

      P only

      D

      both P and Q

      Q only

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        11 mark

        Which statement correctly describes the arrangement of atoms in silicon dioxide?

        • Each silicon atom is bonded to two oxygen atoms and each oxygen atom is bonded to one silicon atom.

        • Each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to two silicon atoms.

        • Each silicon atom is bonded to four oxygen atoms and each oxygen atom is bonded to four silicon atoms.

        • Each silicon atom is bonded to two oxygen atoms and each oxygen atom is bonded to four silicon atoms.

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        21 mark

        Which of the following statements about silicon(IV) dioxide and diamond are correct?

        1 Silicon(IV) dioxide forms a giant ionic lattice structure.
        2 They are both compounds.
        3 They both have very high melting points.
        4 There are strong covalent bonds in silicon(IV) dioxide.

        • 1 and 3

        • 1 only 2

        • 1, 2 and 4

        • 3 and 4

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        31 mark

        Which row correctly describes the use of graphite and silicon(IV) dioxide?

          graphite silicon(IV) dioxide
        A electrodes production of plastics
        B electrolyte production of glass
        C electrolyte production of plastics
        D electrodes production of glass

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          41 mark

          Which row provides a correct description of the structure and properties of silicon(IV) oxide?

            forms an acidic oxide has a giant structure conducts electricity
          A ✓ ✓ cross times
          B ✓ cross times ✓
          C cross times ✓ cross times
          D cross times cross times ✓

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