IGCSEScienceCambridge (CIE)Co-ordinated Sciences (Double Award)ChemistryExam Questions2. Atoms, Elements & CompoundsGiant Structures

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

Exam code: 0654 & 0973

2 hours32 questions

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Giant 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

      4
      1 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.

      Choose your answer

      5
      1 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

      ✓

        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

        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

        Choose your answer

        1
        1 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.

        Choose your answer

        2
        1 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.

        Choose your answer