When polymers are recycled, the ends of the long chain polymer molecules tend to break off, and this process eventually results in a degradation of physical properties, rendering the cycled polymer unusable. Why the breaking off the end of the polymer molecules is favorable from the stand point of the entropy of the system is needs to be explained. Concept introduction: Entropy is explained as degree of randomness in a system. If there are more number of molecules more will be the entropy. In polymerization , monomers combined to form polymer, thus, molecules are in more ordered form and entropy of system decreases. Opposite to this, if polymers are recycled, due to breaking of long chains of polymer, molecules are no more in ordered form. Hence, entropy increases.
When polymers are recycled, the ends of the long chain polymer molecules tend to break off, and this process eventually results in a degradation of physical properties, rendering the cycled polymer unusable. Why the breaking off the end of the polymer molecules is favorable from the stand point of the entropy of the system is needs to be explained. Concept introduction: Entropy is explained as degree of randomness in a system. If there are more number of molecules more will be the entropy. In polymerization , monomers combined to form polymer, thus, molecules are in more ordered form and entropy of system decreases. Opposite to this, if polymers are recycled, due to breaking of long chains of polymer, molecules are no more in ordered form. Hence, entropy increases.
Solution Summary: The author explains that when polymers are recycled, the ends of the long chain polymer molecules tend to break off, and this process eventually results in a degradation of physical properties.
Definition Definition Chemical process in which one or more monomers combine to produce a very large chain-like molecule called a polymer. The functional groups present on the monomers and their steric effects are responsible for polymerization through a sequence of reactions that vary in complexity. There exists a stable covalent chemical bond between monomers that sets apart polymerization from other processes.
Chapter 10, Problem 10.79PAE
Interpretation Introduction
Interpretation:
When polymers are recycled, the ends of the long chain polymer molecules tend to break off, and this process eventually results in a degradation of physical properties, rendering the cycled polymer unusable. Why the breaking off the end of the polymer molecules is favorable from the stand point of the entropy of the system is needs to be explained.
Concept introduction:
Entropy is explained as degree of randomness in a system. If there are more number of molecules more will be the entropy. In polymerization, monomers combined to form polymer, thus, molecules are in more ordered form and entropy of system decreases. Opposite to this, if polymers are recycled, due to breaking of long chains of polymer, molecules are no more in ordered form. Hence, entropy increases.
In the solid state, oxalic acid occurs as
a dihydrate with the formula H2C2O4
C+2H2O. Use this formula to
calculate the formula weight of oxalic
acid. Use the calculated formula
weight and the number of moles
(0.00504mol)
of oxalic acid in each titrated
unknown sample recorded in Table
6.4 to calculate the number of grams
of pure oxalic acid dihydrate
contained in each titrated unknown
sample.
1.
Consider a pair of elements with 2p and 4p valence orbitals (e.g., N and Se). Draw their
(2p and 4p AO's) radial probability plots, and sketch their angular profiles. Then, consider these
orbitals from the two atoms forming a homonuclear л-bond. Which element would have a
stronger bond, and why?
(4 points)
Write the reaction and show the mechanism of the reaction. Include the mechanism
for formation of the NO2+
2. Explain, using resonance structures, why the meta isomer is formed. Draw possible
resonance structures for ortho, meta and para.
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