Giant Covalent Structures Quiz
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5 questions, one answer each
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1. Which statement best describes the structure of diamond?
- A. Each carbon atom is bonded to four other carbon atoms in a continuous 3D network of covalent bonds
- B. Each carbon atom is bonded to three other carbon atoms arranged in layers
- C. Carbon atoms are arranged in rings with delocalised electrons throughout the structure
- D. Each carbon atom is bonded to two other carbon atoms in a linear arrangement
2. Why is graphite useful as a lubricant?
- A. Its layers can slide past each other easily because weak van der Waals forces hold them together
- B. It contains free electrons that reduce friction between surfaces
- C. Its rigid structure prevents it from sticking to other materials
- D. The covalent bonds between layers are easily broken by movement
3. Silicon(IV) oxide, SiO₂, has a similar structure to diamond. Which property would you expect SiO₂ to share with diamond?
- A. A very high melting point and extreme hardness
- B. The ability to conduct electricity at room temperature
- C. Solubility in polar solvents like water
- D. A layered structure with weak forces between layers
4. Graphite can be used as an electrode in electrolysis. Which structural feature allows this application?
- A. Delocalised electrons throughout its structure that can move to conduct electric current
- B. Its ability to form ionic bonds with the electrolyte
- C. The weakness of van der Waals forces allowing ions to penetrate its structure
- D. Its rigid 3D structure that resists chemical attack
5. A material has the following properties: extremely hard, very high melting point, insoluble in all solvents, and does not conduct electricity. Which giant covalent structure best matches these properties, and why?
- A. Graphite, because all its electrons are localised in covalent bonds throughout its 3D network
- B. Diamond or SiO₂, because they both have continuous 3D networks of strong covalent bonds with no delocalised electrons
- C. SiO₂ only, because it contains Si-O bonds which are stronger than C-C bonds
- D. Diamond only, because it is the hardest known natural material