A-LevelChemistryChemical bonding9701/12 · Oct/Nov 2012 · 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?

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AX: 2, Y: 1, Z: covalent

BX: 2, Y: 1, Z: ionic

CX: 4, Y: 2, Z: covalent

DX: 4, Y: 2, Z: ionic

✓ Correct answer

C: X: 4, Y: 2, Z: covalent

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Topic: Chemical bonding, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2012 Paper 1 Variant 2, question 8.

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