Write a condensed structural formula for the repeat unit of the Kevlar molecule
2 answers:
Explanation:
Kevlar is a fiber which is used in making of bullet proof vests and armors. It is a co-polymer which is formed by condensing two organic molecules 1,4-phenylene-diamine and terephthaloyl chloride.
For Structure refer to image attached.
The condensed formula for Kevlar is attached in the image.
Further explanation:
Polymerization is a process through which monomer molecules undergo addition or condensation reaction to form a three-dimensional network structure called polymers. They are also called as macromolecules.
Monomers are defined as low molecular weight compounds that undergo reaction to form high molecular weight compounds called polymers.
Types of polymerization:
Addition polymerization is also known as chain-growth polymerization. It mainly occurs by the reaction in which a carbon-carbon double bond adds to a carbon-carbon double bond. There is no loss of small molecules in it.
Condensation reaction is a reaction where a larger molecule is formed by a reaction between two reactants by loss of small neutral molecules like .
Kevlar is copolymer formed by condensation reaction between 1,4-phenylene-diamine and terephthaloyl chloride by loss of HCl molecule. It is heat resistant and strong synthetic fiber which is used in the making of bulletproof vests and armors.
The copolymerization of Kevlar occurs as follows:
Learn more:
1. To draw a Lewis structure when the condensed formula is given: brainly.com/question/6215269
2. Write the condensed electronic configuration for monoatomic ion: brainly.com/question/8568483
Answer details:
Grade: Senior Secondary School
Subject: Chemistry
Chapter: Polymerization
Keywords: Kevlar, condensation, fiber, polymerization, addition, terephthaloyl chloride and phenylenediamine.
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Answer:
If NO₂ molecule written is for Nitrogen dioxide, then, four of the five molecules presented above have no dipole moment and only one of the five molecules, Ozone (0₃), has a dipole moment.
But if the NO₂ molecule is for nitrite ion, NO₂⁻, then three out of the five molecules presented have no dipole moment and only the Nitrite ion, NO₂⁻, and Ozone, 0₃, have dipole moments.
Explanation:
- The Lewis Structure for the molecules are drawn in the image attached to this answer.
The bond dipole moment uses the idea of electric dipole moment to measure the polarity of a chemical bond within a molecule. It occurs whenever there is a separation of positive and negative charges. Polarity occurs due to differences in electronegativity.
1) Browne or Trihydridoboron, BH₃ - No dipole moment in the molecule.
Each B-H bond in BH₃ is polar/forms a dipole because the B and H atoms have different electronegativities. But, the shape of the molecule is trigonal planar which is symmetrical, so the dipoles/bond polarities cancel. The resulting BH₃ molecule is non-polar.
2)Nitrogen dioxide, NO₂ has no dipole moment.
Nitrite ion, NO₂⁻ -> Has a dipole moment.
There are two NO₂ molecules, the Nitrogen dioxide molecule is linear and has no dipole moment, but the NO₂⁻ ion is a polar molecule. The geometry of the molecule is bent because of a non-bonding pair of electrons. The bent geometry causes the polarity and subsequent dipole moment.
3) Sulfur hexafluoride, SF₆ - no dipole moment.
Sulfur hexafluoride, abbreviated as SF₆, is a nonpolar molecule. SF₆ has an octahedral molecular geometry, which means that the sulfur molecule has six fluorine atoms surrounding it. While each individual bond is polar, there is no net effect as symmetrical nature of this octahedral molecular structure means the dipole moments all cancel out, meaning that the molecule is nonpolar.
4) Ozone, O₃ - has a dipole moment.
O₃ is polar because there are 18 valence electrons, so the lewis structure would position the central O connected to one single bond and one double bond to connect the other O's. The lone pair on the central O would also mean the molecule was bent, thus making it polar. Therefore, Ozone is a polar molecule with a dipole moment of 0.53 D. The molecule can be represented as a resonance hybrid with two contributing structures, each with a single bond on one side and double bond on the other.
5) Phosphorus pentachloride, PCl₅
PCl₅ has a symmetrical geometry, the vector sum of the dipole moments of the different P-Cl bonds cancel each other. Therefore, the overall dipole moment of PCl₅ becomes 0.
Hope this helps!
