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forsale [732]
3 years ago
5

What gives Kevlar its bulletproof strength?

Chemistry
1 answer:
alisha [4.7K]3 years ago
5 0

Answer:

aromatic stacking

Explanation:

Kevlar derives its bulletproof strength from aromatic stacking of its molecules. Although like most compounds having hydrogen bonds, it is quite strong but its unique property which makes it useful due to its strength is as a result of aromatic stacking.

It is an aromatic polymer made up of several units  of monomers of terephthalic acid and 1,4-diaminobenzene.

The stack maximizes the hydrogen bonds and the amide linkages which therefore furnishes its unique strength.

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lora16 [44]

Answer:

0.77093576

Explanation:

4 0
3 years ago
What characteristic do all parts of the electromagnetic spectrum have in common
Elza [17]
All electromagnetic waves are amplitude, a characteristic frequency and wavelength, and the ability to travel through a vacuum at the same speed (the speed of light)
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Nitrogen and hydrogen combine at a high temperature, in the presence of a catalyst, to produce ammonia. N2(g)+3H2(g)⟶2NH3(g) Ass
yaroslaw [1]

Answer:

moles of ammonia produced = 0.28 moles

Explanation:

The reaction is

N_{2}(g)+3H_{2}(g) --> 2NH_{3}(g)

As per equation, one mole of nitrogen will react with three moles of hydrogen to give two moles of ammonia

So 0.140 moles of nitrogen will react with = 3 X 0.140 moles of Hydrogen

             = 0.42 moles of hydrogen molecule.

this will give 2 X 0.140 moles of ammonia = 0.28 moles of ammonia

the moles of ammonia produced = 0.28 moles

Here the nitrogen is limiting reagent.

4 0
4 years ago
Calculate relative mass of chlorine and boron by the help of given data Only 30 mins are left
bazaltina [42]
35.453 (chlorine) + 10.811 (boron) = 46.264
4 0
3 years ago
An electrochemical cell is constructed using two half-cells: Al(s) in Al(NO2)3(aq) and Cu(s) in Cu(NO3)2(aq). The two half cells
wlad13 [49]

Answer:

Cu(s) in Cu(NO₃)₂(aq)

Explanation:

The standard reduction potential (E°) is the energy necessary to reduce the atom in a redox reaction. When an atom reduces it gains electrons from other than oxides. As higher is E°, easily it will reduce. The substance that reduces is at the cathode of a cell, where the electrons go to, and the other that oxides are at the anode of the cell.

The standard reduction potentials from Al(s) and Cu(s) are, respectively, -1.66V and +0.15V, so the half-cell of Cu(s) in Cu(NO₃)₂(aq) is the cathode.

4 0
4 years ago
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