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Classification of polymers - Thermoplastics
These are the polymers that can be simply softened repeatedly while heated and hardened when cooled along with little change in their characteristics. The intermolecular forces in these types of polymers are intermediate among those of fibres and elastomers. There is no cross binding among the chain. The softening occurs like the polymer chain go much more and more freely due to not presence of cross link. While heated, they make a fluid which can be moulded into any desired shapes and after that cooled to get the desired product and melt
Q. The pressure in a liquid droplet of radius r is greater than the pressure of the surrounding equilibrated gas phase by a quantity 2 =r, where is the surface tension. (a) Cons
You make up 0.100 L of a buffer having 1.00 M acetic acid and 1.10 M sodium acetate. The Ka of acetic acid is 1.8 x 10-4. (a) Determine the pH of this buffer.
Ask quesymmetry and clculation of charactersstion #Minimum 100 words accepted#
Q. Show Crystal Field Splitting in Square Planar Complexes? In a d 1 or d 2 system the electrons will always go in the 'e' set of orbitals with the release of corresponding a
The energy released when one mole of ionic crystal is produced by the combination of the corresponding gaseous (+ve) and (-ve) ions brought from infinite distance is known as latti
Calculate how much heat energy is required to raise the temperature of a cube of copper of side 2cm. from 300 to 320k. given: density=8933kg/m cube , atomic weight=63.55, cp=24j/k/
Q. What is Standard Enthalpy of Formation? Ans. It is really difficult to measure the total energy content or absolute entropy of a substance. In order to quantify entropy
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Vulcanization of rubber The procedure of heating natural rubber with sulphur to enhance its properties is known as vulcanization. Vulcanization was illustrated by Charles Goody
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