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

Giant Covalent Structures (Cambridge O Level Chemistry)

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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 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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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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