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Borosilicate glass: in this boric anhydride is used in place of lime. This glass generally contains 75-81% silica, 10-13.5% B2O3, 4.5-6% Na2O and 2-5% Al2O3. Sometimes Zno may be added to improve the properties. Its two outstanding proper is are high chemical resistance and low coefficient of thermal expansion which make it most suitable for laboratory and medical ware, oven and table ware and industries glass ware. Borosilicate glass may contain a small quantity of fluorine which is used to lower the viscosity. Calcium phosphate may also be included in borosilicate composition to produce optimization during forming of the glass. Pyrex is an example of such glasses known for their low coefficient of expansion. These can be made by fusing a mixture of sand, lime, borax and alkali metal carbonates.
which of the following is not a characteristic of plunck''s quantum theory of radiation? A) Radiation are associated with energy B) A body can emit less or more than a quantum of e
Can we vary the pressure while phases remain in equilibrium? Consider a system containing only NH 4 Cl(s), NH 3 (g), and HCl(g). Assume that the equilibrium NH 4 Cl(s) ↔ NH
Write a feature which will distinguish a metallic solid from an ionic solid. a) Explain 'order of a reaction'. b) What is an emulsion?
#space lattice, unit cell, calculation of particles per unit cell, laws of crystallography, symmetry elements in crystals, derivation of braggs equation#
group1 metal reacts execess of oxygen
prepartion
Applications of hybridisation - Size of the hybrid orbitals As s- orbitals are closer to the nucleus than p- orbitals, it is reasonable to suppose that greater the s character
Tranquillizer or Hypnotics: The chemical substances employed for the treatment of stress, mild and harsh mental diseases are called tranquillizers. These are employed to relea
An aqueous solution has a hydroxyl concentration of 1.75 x 10^-7mol/L. Find the concentration of hydrogen ions in this solution.
What is monohaptacity dihaptacity etc ...
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