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

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

Exam code: 5070

2 hours29 questions

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2.6 Giant Covalent Structures

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1
1 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

    Choose your answer

    2
    1 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

      Choose your answer

      3
      1 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.

      Choose your answer

      1
      1 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

      Choose your answer

      2
      1 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.

      Choose your answer

      3
      1 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.

      Choose your answer

      4
      1 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.

      Choose your answer

      5
      1 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

      Choose your answer

      6
      1 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

        Choose your answer

        7
        1 mark

        Silicon(IV) oxide and phosphorus(V) oxide are oxides of elements in Period 3 of the Periodic Table.

        Which row describes the correct properties of these two oxides?

        nature of the oxides

        type of bonding

        melting point of silicon(IV) oxide

        melting point of phosphorus(V) oxide

        A

        acidic

        covalent

        high

        low

        B

        acidic

        covalent

        low

        low

        C

        basic

        ionic

        high

        low

        D

        basic

        ionic

        low

        low

          Choose your answer

          1
          1 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.

          Choose your answer

          2
          1 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

          Choose your answer

          3
          1 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

            Choose your answer

            4
            1 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

            ✓

              Choose your answer