A-LevelChemistryChemical bondingOct/Nov 2012Paper 1 Q81 Mark
Some car paints contain small flakes of silica, SiO2. In the structure of solid SiO2 • each silicon atom is bonded to x oxygen atoms, • each oxygen atom is bonded to y silicon atoms, • each bond is a z type bond. What is the correct combination of x, y and z in this statement?
AX: 2, Y: 1, Z: covalent
BX: 2, Y: 1, Z: ionic
CX: 4, Y: 2, Z: covalent
DX: 4, Y: 2, Z: ionic
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The correct answer is C. This question tests the candidate's understanding of chemical bonding within the Chemistrysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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