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1. Distinguish between primary and secondary bonding in polymers What is the term for a chemical reaction in which two or more molecules combine with the separation of water? 2. Vinyl chloride has the formula CH,-CHCI and polymerizes to form polyvinyl chloride. What is the degree of polymerization of a polymer having an average molecular weight of about 33,000? 3. What is the degree of polymerization (DP) of LDPE having an average molecular weight (mass) of 27,980? 4. Explain the roles of cross linking, branching, thermosetting, and alloying of polymers. 5. What is the difference between molecular weight (mass) and average molecular weight? 6.

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