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Thermosetting polymers - Classification of polymers
These are the polymers which go through permanent modification on heating. They get firm and infusible on heating. They are generally built from low molecular mass semifluid molecules. While heated they went highly cross linked to make hard infusible and insoluble components. The cross links take the atom in place that is why heating does not permit them to move liberally. Thus a thermosetting plastic is cross linked and is lastingly rigid.
The number of electrons in [ 40 19 k ] -1 is: (1) 19 (2) 20 (3)18 (4)40 Ans: 40
Yes....because at boyles law....ideal gas equation is used and z=1 for PV=nRT
write a balanced equation for the reaction in which dinitrogen pentoxide reacts with water to produce nitric acid
Completeness of a harmitian operator
1. Wet air containing 4.0 mole% water vapor at 76°F and 14.8 psia is passed through a column of calcium chloride pellets. The pellets absorb 97% of the water and none of the oth
Explain Resonance effects Resonance effects: The application of the resonance effect for predicting the relative rates of acid-catalyzed ester and amide hydrolyses is exactly
The wave nature of an electron was first given by: (1) De-Broglie (2)Heisenberg (3)Mosley (4)Sommerfield Ans: De-Broglie
Nucleophilic aromatic substitution is possible, but involves substitution of a typical leaving group rather than a hydrogen atom. Remembering that S N 2 and S N 1 mechanisms are no
Why Microwave performed at low temperature and low pressure
Q. What is Base units? There are seven base units given in SI. A base unit is a unit of calculate that is based on an object or event in the physical world. Lists of the seve
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