Explain why trivalent cations with a large difference between octahedral and tetrahedral EECC form exclusively normal spinels, while bivalent cations with high EECC form inverse spinels.

1). The susceptibility of FeCl₂ obeys the Curie-Weiss law over the temperature range 90 K to room temperature (293K), with 0 =48K. Its molecular susceptibility at room temperature is 1.475 1022 emu/Oe g mol). (Use: N= 6.022 x 1023 atoms/g-mol, KB= 1.38 × 10-¹6 erg/K) (a) Show that the effective magnetic moment is 5.4 µB. (b) Show that the value of J is 2.25. (c) At an applied field of 8000 Oe, what is the value of the molecular field at 0 °C ?

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Frenkel and Schottky are intrinsic or extrinsic defects, point or linear defects.

what is the mole fraction of cyclohexane in the solution ? information is in the paper

The HI molecule has an equilibrium bond length of 1.59 Angstroms and a dipole moment of 0.42 Debye. IF one were to treat this molecule as a pair of point charges +-q separated by the same distance as its bond length, what would the magnitude of q need to be to give the experimental dipole moment? Express your answer as q divided by the proton charge. In other words, what fraction of a full proton charge is the charge magnitude of the ion pair?

5. Why are Pearson symbols not sufficient to precisely describe all crystal structures?

the following figure shows the bond distances for the homonuclear diatomics of the 2 nd period p-block elements, as well as those for some of the ions derived from these species.      i) Note that N 2 + has a longer bond distance than N 2, but O 2 + has a shorter bond distance than O 2. Explain this difference.       ii) Estimate the bond distance of N 2 - and justify your answer.

True or false and why is false 1   There are 2 major classes of keratins: alpha keratins (found in mammals) and beta keratins (found in feathers and scales of birds and reptiles) 2  One estimate of mobility within a crystal is the B-factor that reflects spreading or blurring of electron density   3 In NMR, the longitudinal relaxation time (T1) reflects the rate at which magnetization returns to the longitudinal axis after a pulse

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