Chapter 22, Problem 14P

Write the difference between ferromagnetism and anti-ferromagnetism.

Boron nitride (BN) has a structure similar to graphite, but is a white insulator rather than a black conductor. It is synthesized by heating diboron trioxide with ammonia at about 1000°C. (a) Write a balanced equation for the formation of BN; water forms also.(b) Calculate ΔH°rxn for the production of BN (ΔH°f of BN is -254 kJ/mol).(c) Boron is obtained from the mineral borax, Na₂B₄O₇.10H₂O.How much borax is needed to produce 1.0 kg of BN, assuming 72% yield?

What are the various phases of SiO2?

Cadmium selenide (CdSe) is used as a semiconductor quantum dot and is an example ofnanotechnology that is being developed for use as a theranostic.b) What physical chemical properties enable it to be developed as a theranostic?

Differentiate the properties of carbon filter,  ceramics, and micro alloys

Magnesium ions are removed in water treatment by the addition of slaked lime, Ca1OH22. Write a balanced chemical equation to describe what occurs in this process.

Carbon exists as several allotropes including buckminsterfullerene and carbonnanotubes. All are composed of pure carbon, but their materials properties differdramatically due to the different arrangements of atoms in their structures. Name TWO(2) other allotropes and compare both of them in terms of:i) crystal structure with a suitable diagram.ii) electrical properties

Materials, properties and testing Describe the effect compression testing have on thermal, electrical and physical properties of silicon nitride.

The heat of fusion for actinium is 10.50 kJ/mol. The entropy of fusion for actinium is 9.6 J/mol x K. From this data, calculate the melting point (in oC) of actinium.