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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.
Thallium bromide (TlBr) has a cesium chloride (CsCl) crystal structure.
i. Draw a unit cell of TlBr and determine the coordination number of Tl+ and Br- ions.
ii.Determine in which cubic form the TlBr occurs.
iii.Calculate the total number of ions in the cell unit.
iv. It is true that the edge length (a) of this crystal lattice is 2.31 times the radius (r) of the ions in the crystal? Justify your answer.
v. If the crystal has edge length (a) of 36.5 cm, calculate density of the crystal.
what is the open chain form og a-D-fructose monosaccharide
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?
What are the similarities and the difference between:
i. a 1s orbitals and a 3s orbitals
ii. a 2px orbitals and 2pz orbitals
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