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← ScienceWhich outcome occurs when a covalent molecular crystal is thermally stressed above its glass transition temperature?
A)Increased long-range molecular chain mobility✓
B)Molecular bond dissociation decreases rapidly
C)Increased elastic modulus with brittle failure
D)Molecular orbital overlap prevents elongation
💡 Explanation
The polymer chains gain mobility due to exceeding energy barriers; because the chains can reconfigure via chain relaxation, there is increased mobility. This outcome is preferable, relaxing internal stresses rather than chain scission as B suggests.
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