Silicon dioxide (SiO2\text{SiO}_2SiO2, quartz) and carbon dioxide (CO2\text{CO}_2CO2, dry ice) are both oxides of Group 14 elements. Which of the following correctly describes the main bonds or forces that are overcome when quartz melts at 1710∘C1710^\circ\text{C}1710∘C and when dry ice sublimes at −78.5∘C-78.5^\circ\text{C}−78.5∘C?
Covalent bonds in SiO2\text{SiO}_2SiO2; intermolecular forces in CO2\text{CO}_2CO2
Intermolecular forces in SiO2\text{SiO}_2SiO2; covalent bonds in CO2\text{CO}_2CO2
Covalent bonds in both SiO2\text{SiO}_2SiO2 and CO2\text{CO}_2CO2
Ionic bonds in SiO2\text{SiO}_2SiO2; intermolecular forces in CO2\text{CO}_2CO2
74 exam-style questions on OCR GCSE Chemistry Bonding. Each one has a worked solution and a mark scheme showing where the marks go.