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t is the difference between a monomer and a polymer?

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter2: Atoms And Molecules

Section: Chapter Questions

Problem 2.37PAE: 2.37 Why are empirical formulas preferred for describing polymer molecules?

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Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.

Question

What is the difference between a monomer and a polymer?

Definition Definition Large and very high-molecular-weight substances that consist of hundreds to thousands of repeating units. Polymers are also known as macromolecules. Number-average-molecular weight is the measuring system for the polymers.

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Polymers are molecules of high molecular mass formed by joining together large numbers of small molecules, called monomers. There are two general methods of creating polymers. In addition polymerization, monomers couple through the opening of their multiple bonds, as seen in the formation of polyethylene.(Figure 1) In condensation polymerization, two monomers join by the elimination of a small molecule such as water, as seen in the formation of proteins from amino acids. (Figure 2) Figure Condensation Polymerization HRO HRO || ---H-N-C-C-0-H T H T H H < 2 of 2 Amino Acids HROHRO | | || TI -N-C-C-N-C-C--- + H₂O || -C-O-H--→ H Protein R=H, CH3, or other group of atoms Draw the monomer used to make the following polymer via addition polymerization. H H H HH 1 1 T C=C-C-C C C-C-C-C-C-C--- T T I T T H CH₂ H H H CH3 H H H CH₂ H H [] Draw the molecule by placing atoms on the grid and connecting them with bonds. ► View Available Hint(s) H 8 i ?
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