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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.
what is chemical properties of p block elements
Discuss the effect of substituents on the acidity of phenolic group?
describe vesper theory?
Line Spectru- A emission spectrum that contains very sharp peaks (Prism Like Structure) , corresponding to transitions between states in free atoms.For example, the line spectrum o
Free radical aromatic substitution - Hydrocarbon The aromatic substitution reactions that follow free radical mechanisms are extremely few and have limited synthetic value. Alt
Energy cycle or metabolism A cell has small molecules that are denoted as micromolecules also large molecules that is denoted as macromolecules. The chemical equations of a liv
Its Tetrahedral ( 4 sigma bonds )
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fiehes test means result if positive result always color change if negative color change or not
The maximum number of electrons which each sub-shell can occupy is: (1) 2n 2 (2) 2n (3) 2 (2l+1) (4) (2l+1) Ans: 2
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