Inorganic Chemistry Answers

Sio2 has more glass Transition temperature than BaF.why

(a) Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: a gold coin, a cup
of coffee, a wood plank. (b) What ambiguities are there in answering part (a) from the descriptions given?
Solution:
a. A gold coin is probably a solid solution. Pure gold (element 79) is too soft and too valuable to be used for
coinage so other metals are usually added; A cup of coffee is a solution (if there no suspended solids like
coffee grounds) or an heterogenous mixture if there are grounds. If cream or sugar is added, the
homogeneity of the mixture depends on how thoroughly the components are mixed; A wood plank is a
heterogenous mixture of various cellulose components. The different domains of in the mixture are visible
as wood grain or knots.
b. The ambiguity in each of these examples is that the name of the substance does not provide a complete
description of the material. We rely on mental images, and these vary from person to person.
PRO

Washing soda, Na2CO3, is used in the manufacture of glass, pulp, and paper. What is its percentage composition?

Use periodic table to prove that the total formula mass is conserved in this equation:
Na2CO3 + H2O = NaOH + H2CO3

what is the energy of a mole of photons that have a wavelength of 705 nm?

Solid materials can be classified into three different categories named crystalline, polycrystalline and amorphous. Advance studies in material chemistry lead to development of technology and innovation. (a) Define the factors that should be taken into consideration when innovating new materials.

What are the similarities and the difference between:
i. a 1s orbitals and a 3s orbitals
ii. a 2px orbitals and 2pz orbitals
The highest energy electrons in an atom Q have the principal quantum number n = 4 and the angular quantum number l = 0. What is the maximum number of electrons present in atom Q?

Zinc sulphide (ZnS) has two common polymorphs which is sphalerite and wurtzite.
i. Diffrentiate the arrangement of ions in the sphalerite and wurtzite structure.
ii. By using your own illustration, briefly explain two most common atom orientations that generate close-packed lattice.

Miller indices form a notation system in crystallography for planes in crystal (Bravais) lattices. In particular, a family of lattice planes is determined by three integers.
a) Draw the following planes of Miller Indices in the given cubic lattice.
i. (0 1 1)
ii.(1 3 2)
iii.(1 0 2)
iv.(0 2 1)
v.(2 0 2)

Solid materials can be classified into three different categories named crystalline, polycrystalline and amorphous. Advance studies in material chemistry lead to development of technology and innovation.
(a) Define the factors that should be taken into consideration when innovating new materials.
(b) What makes crystal is different from amorphous material? Give one example for each type of materials.