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Vulcanization: Vulcanization is very widely used in rubber technology to improve the properties such as low tensile strength, plastic nature, thickness etc. by adding some chemicals like sulphur, hydrogen sulphide, benzene chloride etc. it is done by heating of raw rubber with sulphur at 100: 140 degree centigrade temperature. The added sulphur combines chemically as the double bonds of different rubber springs. Sulphur can also bring about vulcanization without affecting the double bonds in the polymer molecule, by eliminating H2S. The rate of vulcanization of rubber is quite slow and also depends upon the types and quality of rubber used. But, by using certain organic compounds called accelerators, vulcanization reaction speed up.
The value of the energy for the first excited state of hydrogen atom will be: (1) - 13.6 ev (2)- 3.40 eV (3) -1.51eV
How could lipids and proteins form lipoproteins, stable superstructures which can be simply transported in blood? How would a) cholesterol b) esters of cholester
explain the scale and sludge formation?
Q. Illustrate Nature of light as a particle? Ans. You have seen that when excited electrons return to the ground state they release packets of energy, called photons. Photons
THermodynamic free enrgy is the amount of work a thermodynamic system can perform. The concept is useful in the thermodynamics of chemical or thermal processes in engineering and
What is the advantage of using a flame photometer instrument designed to operate with an internal standard ?
Q) Whcih process according to Nelson's or caster - Keller process, is betterfor producing NAOH; Explain tha process Ans: Nelson's Process:- ( Perforated diaphragm Process) Princ
how can i make best assignment on unit cell topic?
Which of the following principles/rules limits the maximum number of electrons in an orbital to two: (1) Aufbau principle (2) Pauli's exclusion principle (3) Hund's rule
Choose the best definition of temperature
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