Giant covalent structures — Paper 2 · IGCSE Chemistry (9-1) 0971

4 The ‘lead’ in a pencil is made of a mixture of graphite and clay. ‘lead’ When the percentage of graphite is increased, the pencil slides across the paper more easily. Which statement explains this observation? A Graphite has a high melting point. B Graphite is a form of carbon. C Graphite is a lubricant. D Graphite is a non-metal.

1 marks

Answer: C

This question in 0971/21 May/June 2018

6 Which substance is not a macromolecule? A diamond B graphite C silicon(IV) oxide D sulfur

1 marks

Answer: D

This question in 0971/21 May/June 2018

7 Which statement about the structure and properties of silicon(IV) oxide is not correct? A It has a giant structure similar to that of diamond. B It has a high melting point due to the strong attractive force between molecules. C There are strong covalent bonds between silicon and oxygen. D There are no free electrons, so silicon(IV) oxide does not conduct electricity.

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2019

10 Which statement explains why graphite is used as a lubricant? A All bonds between the atoms are weak. B It conducts electricity. C It has a low melting point. D Layers in the structure can slide over each other.

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2020

6 The arrangement of particles in each of two solids, S and T, are shown. S T What are S and T? S T A diamond silicon(IV) oxide B diamond sodium chloride C graphite silicon(IV) oxide D graphite sodium chloride

1 marks

Answer: B

This question in 0971/21 May/June 2021

6 Information about four substances E, F, G and H is shown. melting point / C electrical conductivity E 1710 does not conduct when solid F 3500 conducts when solid G 120 does not conduct H 801 conducts when molten E, F, G and H are graphite, poly(ethene), sodium chloride and silicon(IV) oxide but not in that order. What are E, F, G and H? E F G H A graphite poly(ethene) silicon(IV) oxide sodium chloride B sodium chloride graphite poly(ethene) silicon(IV) oxide C poly(ethene) sodium chloride graphite silicon(IV) oxide D silicon(IV) oxide graphite poly(ethene) sodium chloride

1 marks

Answer: D

This question in 0971/22 May/June 2021

6 Some properties of diamond are shown. 1 It is very hard. 2 Every atom forms four bonds. 3 It does not conduct electricity. Which properties are also shown by silicon(IV) oxide? A 1 only B 1 and 2 C 1 and 3 D 2 and 3

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2021

8 Which substance is described as a macromolecule? A ammonia B graphite C iron D sodium chloride

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2021

5 The diagrams show the structures of three macromolecules P, Q and R. P Q R What are P, Q and R? P Q R A diamond silicon(IV) oxide graphite B graphite diamond silicon(IV) oxide C silicon(IV) oxide diamond graphite D silicon(IV) oxide graphite diamond

1 marks

Answer: C

This question in 0971/22 May/June 2022

24 The diagram represents the structure of a solid. Which solids does the diagram represent? brass graphite sodium chloride A Jv v x B Jv x x Cc x v v D x x v

1 marks

Answer: B

This question in 0971/21 May/June 2023

4 Which structure does silicon(IV) oxide most closely resemble? A carbon dioxide B diamond C graphite D sodium chloride

1 marks

Answer: B

This question in 0971/22 May/June 2023

6 Which substance has the lowest melting point? A graphite B methanol C silicon(IV) oxide D sodium chloride

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2023

5 The structures of three substances are shown. 1 2 3 Which substances are hard and have a high melting point? A 1, 2 and 3 B 1 only C 2 only D 2 and 3 only

1 marks

Answer: D

This question in 0971/22 May/June 2024

8 Diamond and graphite have giant covalent structures of carbon atoms. Which statement describes graphite? A It has a strong, rigid three-dimensional structure. B It has four strong covalent bonds between each carbon atom. C It has layers, which can slide over each other. D It has no delocalised electrons so does not conduct electricity.

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2024

6 Which statement about silicon(IV) oxide, SiO2, is correct? A It conducts electricity because it contains delocalised electrons. B It has a giant covalent structure with each silicon atom bonded to four oxygen atoms. C It is a simple covalent molecule. D Its structure is similar to that of graphite.

1 marks

Answer: B

This question in 0971/22 May/June 2025

8 Graphite and diamond are both forms of the element carbon. Which row shows the number of other carbon atoms that each carbon atom is covalently bonded to in graphite and in diamond? graphite diamond A 3 3 B 3 4 C 4 3 D 4 4

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2025