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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
Mutation: A mutation is a physical or chemical change which changes the sequence of bases in DNA molecule. Anything which causes mutation is known as mutagen. A mutation conseq
Q. What are Trioxides? The selenium and tellurium trioxides are not stable, SO 2 , is the only important trioxide in the group. Its preparation has been described above. Sul
Evaluate the relation between rate constant k 1 and k 2 of a first order reaction when temperature changes from 270 K to 300 K and activation energy is zero?
Explain the Components approach to the phase rule? The derivation of the phase rule in this section uses the concept of components. The number of components, C, is the minimum
Q. How do you determine the oxidizing or reducing agent? Ans. A substance that oxidizes another substance is called an oxidizing agent. One that reduces another substance
Which of the following sets is possible for quantum numbers : (1) n=4, l=3, m= -2 , s=0 (2) n=4, l=4, m= +2 , s=1/2 (3) n=4, l=3, m= -2 , s=+1/2 (4)
how to calculate equivalent weight of LMnO4
An aqueous solution has a hydroxyl concentration of 1.75 x 10^-7mol/L. Find the concentration of hydrogen ions in this solution.
Applications of photochemistry in day today life
effects of ano,alous behaviour of beryllium
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