S2 Structure 2: Models of bonding and structure

Practice questions on Structure 2: Models of bonding and structure

• Explain why fullerene C₆₀ has a much lower melting point than diamond, despite both being … (4 marks, Explain)
• Explain why silicon dioxide (SiO₂) has a much higher melting point than carbon dioxide (CO… (4 marks, Explain)
• Explain why metals can be drawn into wires (are ductile) and why a metal's electrical cond… (4 marks, Explain)
• Explain why metals have high melting points and why the melting point of a metal generally… (4 marks, Explain)
• Explain why metals have high thermal conductivity and why this property decreases when the… (4 marks, Explain)
• Explain why metals are malleable and why alloys are generally less malleable than the pure… (4 marks, Explain)
• Explain why metals generally have high electrical conductivity and why this conductivity d… (4 marks, Explain)
• Explain why carbon dioxide (CO₂) is a non-polar molecule despite containing two polar cova… (4 marks, Explain)
• Explain why magnesium oxide (MgO) has a higher melting point than sodium chloride (NaCl). (4 marks, Explain)
• Explain why potassium iodide (KI) dissolves readily in water but does not conduct electric… (4 marks, Explain)
• Explain why calcium fluoride (CaF₂) is a solid at room temperature with a high melting poi… (4 marks, Explain)
• Explain why a molten ionic compound conducts electricity but the same compound in its soli… (4 marks, Explain)
• Explain why the bond angle in sulfur dioxide (SO₂) is approximately 119°, which is less th… (4 marks, Explain)
• Explain why lithium fluoride (LiF) is described as an ionic compound and outline the proce… (4 marks, Explain)
• Explain why the bond angle in a water molecule (H₂O) is approximately 104.5°, which is les… (4 marks, Explain)
• Explain why the bond angle in ammonia (NH₃) is approximately 107°, which is less than the … (4 marks, Explain)
• Explain why the boiling point of hydrogen fluoride (HF) is significantly higher than that … (4 marks, Explain)
• Explain why graphite can conduct electricity whereas diamond cannot, despite both being al… (4 marks, Explain)
• Explain why graphene is an electrical conductor, whilst poly(ethene) is an electrical insu… (4 marks, Explain)
• Explain why carbon fibres used in high-performance materials are strong and stiff, yet nyl… (4 marks, Explain)