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O LevelChemistryCambridge (CIE)Exam Questions2. Atoms, Elements & Compounds2.6 Giant Covalent Structures

Giant Covalent Structures (Cambridge (CIE) O Level Chemistry): Exam Questions

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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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