1. Classify the following as discrete molecules or solid state compounds with ex
ID: 543292 • Letter: 1
Question
1. Classify the following as discrete molecules or solid state compounds with extended structures Tio2 CsH12 SiH4. GaAs. 2. Which of the following combinations of atoms do you expect to yield a discrete molecule and which should produce an extended solid? Ba,O, 3. Gallium cyanide has a cubic structure with the Ga atoms sitting at the eight corners of the cube and the (CN) ligands aligned along the 12 edges of the cube: Na, F -Ge,H (a) What is the molecular formula of the compound? What is the oxidation number of Ga? (b) How many formula units per cell? Explain your answer using fractional Ga and CN contributions. (c) Is the unit cell primitive or non-primitive? Is it simple cubic, body centered or face centered cubic? Please explain. (d) What is the coordination of the Ga atom (how many CN ligands surround the Ga atom)? (e) What in the coordination of the CN ligand? Does the answer make chemical sense? Explain. (f) Estimate the average Ga-C (or Ga-N) bond length given that the unit cell parameter is a = 5.293 Å and the triple bonded C-N bond length is 1.125 Å in the structure. Assume Ga-N and Ga-C hve the same bond lengths. Please show your work.Explanation / Answer
1.
TiO2 is an ionic compound so it does not have the discrete molecules but has extended three dimentional electrostatic force between Ti4+ and O2- ions.
C5H12 is pentane which is molecular compound hence it has discrete molecules.
SiH4 also a molecular compound hence it has discrete molecules.
GaAs is an diode which has exteneded structrue.
2.
Discrete molecules can be formed by N, O and Ge, H
Extended solids can be formed by Ba, O and Na, F
Note:
Atoms with electronegativity difference less than 1.7 can form molecular compounds where as atoms with electronegativity difference more than 1.7 can form ionic compounds.
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