The spinels have a general formula AIIB2IIIO4.  The oxide an…

The spinels have a general formula AIIB2IIIO4.  The oxide anions form a ccp (fcc) lattice and the cations occupy the tetrahedral or octahedral holes.  For NiFe2O4, please answer to the following questions (Please write your answer on a paper and upload the image file in the Assignments) : (a) Determine the CFSEs of Ni2+ occupying the tetraheral and octahedral holes in terms of Δo.  You must draw the electron configurations in the energy level diagrams (Note: The oxides are weak-field (high-spin) ligands and Δt ~ (1/2) Δo).      (b) Determine the CFSEs of Fe3+ occupying the tetraheral and octahedral holes in terms of Δo.  You must draw the electron configurations in the energy level diagrams (Note: The oxides are weak-field (high-spin) ligands and Δt ~ (1/2) Δo).      (c) Which cation (Ni2+, Fe3+) prefers the octahedral holes more strongly?  Briefly explain your answer. (d) Would you expect NiFe2O4 to form a normal or inverse spinel?  Briefly explain your answer.

The radii of Mg2+ and S2- are 0.86 and 1.70 Å, respectively….

The radii of Mg2+ and S2- are 0.86 and 1.70 Å, respectively.  Therefore, the radius ratio of MgS is   _______ , which indicate that the maximum coordination number for the magnesium cation should be _______ .  If MgS assumes a rock-salt structure (NaCl), the S2- will form a _______ lattice and Mg2+ will occupy  _______ holes.

Dr. Gowen decides to conduct the above study and see if spen…

Dr. Gowen decides to conduct the above study and see if spending time on TikTok decreases students’ overall grades. From her general psychology class, she records students’ overall grades. Then, she assigns students to two groups. Group 1 will watch TikTok videos every day for 30 minutes; Group 2 will not watch TikTok videos at all. The study will continue for 1 month. At the end, she will again record students’ overall grades. In the above study, what is the independent variable?