Which microscopic properties allow Kevlar and spider silk to
be so strong?
A. large strongly charged atoms and forces within tight coils of molecules
B. strong chains of molecules that form tight balls
C.large strongly charged atoms with strong intermolecular forces between layers
D. strong chains of molecules and strong intermolecular forces between
layers
This is not my field but I would go with D since spider webs are composed of protein chains and hydrogen bonds (intermolecular forces) and kevlar is polyamide chains and hydrogen bonds.
The microscopic properties that allow Kevlar and spider silk to be so strong are strong chains of molecules and strong intermolecular forces between layers.
To arrive at this answer, we can analyze the given options and eliminate the ones that don't describe the microscopic properties of Kevlar and spider silk.
Option A suggests that large strongly charged atoms and forces within tight coils of molecules contribute to the strength of Kevlar and spider silk. While it's true that these materials have tight coils of molecules, the presence of large strongly charged atoms is not a significant factor in their strength.
Option B states that strong chains of molecules form tight balls, but this is not an accurate representation of the structure of Kevlar and spider silk. They have strong chains of molecules, but they do not form tight balls.
Option C mentions large strongly charged atoms and strong intermolecular forces between layers. The presence of large strongly charged atoms is again not a key factor, but the mention of strong intermolecular forces between layers is more relevant for Kevlar and spider silk's strength.
Option D, which states strong chains of molecules and strong intermolecular forces between layers, correctly summarizes the microscopic properties of Kevlar and spider silk. These materials have strong chains of molecules that contribute to their overall strength, and they also possess strong intermolecular forces between layers, which further enhances their strength.
Therefore, the correct answer is D: strong chains of molecules and strong intermolecular forces between layers.
The correct answer is D. Strong chains of molecules and strong intermolecular forces between layers.
Kevlar and spider silk are both known for their strength and durability. This is due to their unique microscopic properties.
Both Kevlar and spider silk have strong chains of molecules that form tight bonds. These chains are made up of repeating units, which create a strong molecular structure.
Additionally, both materials have strong intermolecular forces between layers. These forces, known as hydrogen bonds, help hold the molecules together and contribute to the overall strength of the material.
Therefore, the combination of strong chains of molecules and strong intermolecular forces between layers allows Kevlar and spider silk to be so strong.