packing efficiency & calculations involving unit cell

Efficiency of packing in hcp and ccp structures - We have discussed earlier that in both type of close packing (hcp and ccp) approximately amount of the available volume is occupied by spheres (atom..

We have discussed earlier that in both type of close packing (hcp and ccp) approximately amount of the available volume is occupied by spheres (atoms..

In two-dimensional packing, hexagonal close packing is more efficient. In three dimensions the second layer spheres are placed in the A voids and B voids are unoccupied. In the second layer there are C and D voids. The third layer is placed such that it covers the C v..

a) Square close packing - Particles when placed in the adjacent rows show a horizontal as well as vertical alignment and form squares. b) Hexagonal close packing - Packing in every next row are placed in the depression between the particles of the first row. Hexagonal..

>Burning of sulphur or iron pyrites in oxygen is preferred to purified air since heat energy is wasted in heating the unreactive nitrogen component of the air. The mixture of sulphur dioxide and air obtained contains various impurities which must be removed; or else the catalyst loses its effi..

Summary - In photosynthesis, light energy is converted to chemical energy and carbon is fixed into organic compounds. Light energy is captured by the living world by means of pigments. The pigments involved in photosynthesis in eukaryotes include the chlorophyll and carotenoids. Light absorbed by t..