Question 8 · Complements de química URV Exam Bridging Courses in Chemistry

Tema: Sólidos, energía reticular y fuerzas intermoleculares · Del examen Exam Bridging Courses in Chemistry

Enunciado

Question 8 (1 point). Crystal structures and bonding in solids A and B

Consider the unit cells corresponding to two crystalline solids labeled A and B:

a)

Identify the packing type for the main lattice, the type and fraction of occupied interstitial holes for each cell, and the archetype structure name (if applicable).

b)

State the coordination number of each ion/atom in both unit cells.

c)

Propose the predominant type of chemical bond present in each solid.

Enunciado: Question 8 · Complements de química URV Exam Bridging Courses in Chemistry

Solución

Según los criterios oficiales de corrección

a) Identify the packing type for the main lattice, the type and fraction of occupied interstitial holes for each cell, and the archetype structure name (if applicable): Solid A

Solución: Solid A: Hexagonal close-packed (hcp) array of anions with 100% of octahedral interstitial sites occupied by cations; Nickel arsenide (NiAs) structure type.

a) Identify the packing type for the main lattice, the type and fraction of occupied interstitial holes for each cell, and the archetype structure name (if applicable): Solid B

Solución: Solid B: Cubic close-packed / face-centered cubic (ccp / fcc) array of anions with 100% of octahedral holes occupied by cations; Sodium chloride (NaCl) structure type.

b) State the coordination number of each ion/atom in both unit cells.

Solución: Solid A (NiAs): (6, 6) coordination; Solid B (NaCl): (6, 6) coordination.

c) Propose the predominant type of chemical bond present in each solid.

Solución: Solid A: Intermediate between ionic and metallic bonding; Solid B: Predominantly ionic bond.

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