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← ScienceWhich outcome occurs when applying mechanical stress to a molecular solid?
A)Chain scission decreases molar mass✓
B)Increased crystallinity enhances transparency
C)Debonding modifies electronic band structure
D)Plastic deformation exceeds elastic limit
💡 Explanation
Chain scission happens because mechanical stress overcomes van der Waals attractions during crack propagation. This is known as a fracture. This process reduces average polymer chain length; therefore it decreases the molar mass, rather than increasing crystallinity or band structure; plastic formation requires higher stress.
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