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Chapter 18: Problem 16

This polymer is called silicone and has a noncarbon, "inorganic" backbone of alternating silicon and oxygen atoms: (a) Put a set of parentheses around one monomer unit. (b) Another name for this polymer is polydimethylsiloxane. Explain why it has this name.

Short Answer

Expert verified
(a) One monomer unit of silicone can be represented as: \((\text{CH}_3\text{SiO})\). (b) The name "polydimethylsiloxane" comes from: "Poly" referring to a polymer, "dimethyl" for the two methyl (CH3) groups bonded to each silicon atom, and "siloxane" for the alternating silicon and oxygen atoms forming a siloxane bond (-Si-O-).

Step by step solution

01

Identify silicone's monomer unit

To identify the monomer unit for silicone, look at its given structure, focusing on the pattern of alternating silicon (Si) and oxygen (O) atoms, with two methyl groups (CH3) bonded to each Si atom. Observe the repeating units that make up the structure and place parentheses around a single unit.
02

Name: Polydimethylsiloxane

The name "polydimethylsiloxane" is derived from different parts of the polymer's structure: 1. "Poly" indicates that the molecule is a polymer, composed of a repetition of monomer units. 2. "Dimethyl" accounts for the two methyl (CH3) groups bonded to each silicon atom in the structure. 3. "Siloxane" is a term that originates from the combination of "silicon" and "oxygen" atoms (alternating Si and O) in the polymer backbone, forming a siloxane bond: -Si-O-. Put together, the name "polydimethylsiloxane" accurately describes the structure of this polymer.

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