Home / iGCSE Chemistry Multiple Choice (Extended) : 2.6 Giant covalent structures: Exam Style Questions Paper 2

iGCSE Chemistry Multiple Choice (Extended) : 2.6 Giant covalent structures: Exam Style Questions Paper 2

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters
Question

Which row identifies a property and an explanation of the property for both diamond and silicon(IV) oxide?

 propertyexplanation of property
Avery harddiamond has a giant covalent structure and silicon(IV) oxide has a giant ionic structure
Bhigh melting pointboth have giant covalent structures with many strong bonds between the atoms
Cgood lubricantboth have layers of atoms, which can slide over each other
Dpoor conductorboth contain only non-metal elements and are simple molecules
▶️ Answer/Explanation
Solution

Ans: B

Both diamond and silicon(IV) oxide (silica) have giant covalent structures with strong covalent bonds between their atoms. This explains their high melting points as a lot of energy is needed to break these strong bonds.

Option A is incorrect because silicon(IV) oxide has a giant covalent structure, not ionic. Option C is wrong because neither has layered structures (graphite does, but not diamond or silica). Option D is incorrect because while they are poor conductors, it’s not because they’re simple molecules – they’re actually giant structures.

Question

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.

▶️ Answer/Explanation
Solution

Ans: C

Graphite has a layered structure where each carbon atom forms three covalent bonds, creating hexagonal sheets. These layers can slide over each other, which is why graphite is slippery and used in pencils.

Option A describes diamond’s structure. Option B is incorrect because graphite has only three bonds per carbon atom (not four). Option D is wrong because graphite does have delocalized electrons between layers, which allows it to conduct electricity.

Question

Which pair of statements about diamond and graphite is correct?

A. Diamond and graphite are both pure carbon. They are both macromolecules.
B. Diamond and graphite can both be used as electrodes. Graphite is also used as a lubricant.
C. Diamond has covalent bonds. Graphite has ionic bonds.
D. Diamond is hard with a high melting point. Graphite is soft with a low melting point.

Answer/Explanation

Ans:

A

Question

Which diagram represents the structure of silicon(IV) oxide?

Answer/Explanation

Ans: D

More iGCSE Chemistry Paper 2 Questions.............
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