Polymers
Chemistry ⇒ Carbon and Organic Chemistry
Polymers starts at 12 and continues till grade 12.
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See sample questions for grade 12
A sample of a polymer has a molecular mass of 100,000 g/mol. If the monomer has a molar mass of 100 g/mol, what is the degree of polymerization?
Define the term 'copolymer'.
Describe the main difference between addition and condensation polymerization.
Describe the role of initiators in free radical polymerization.
Describe the structure of low-density polyethylene (LDPE).
Explain the difference between thermoplastic and thermosetting polymers.
Explain the term 'cross-linking' in polymers.
Explain the term 'degree of polymerization'.
Explain why natural rubber is soft and sticky at room temperature but becomes hard and less sticky after vulcanization.
Explain why thermosetting polymers cannot be remolded after setting.
Name one environmental problem associated with synthetic polymers.
Name the monomer of polystyrene.
Name the monomers used to produce nylon-6,6.
State one use of polyvinyl chloride (PVC).
State the main use of Bakelite.
A certain polyester is formed by the condensation of a dicarboxylic acid and a diol. If 0.5 mol of the acid reacts with 0.5 mol of the diol, what is the maximum number of ester linkages that can be formed?
A polymer sample contains 60% chains with a molecular mass of 50,000 g/mol and 40% chains with a molecular mass of 100,000 g/mol. Calculate the number average molecular mass (Mn) and the weight average molecular mass (Mw) of the sample.
Describe the role of plasticizers in modifying the properties of polymers and provide an example of a commonly used plasticizer.
Discuss the environmental impact of microplastics and suggest two chemical strategies for mitigating their accumulation in ecosystems.
Explain the difference between isotactic, syndiotactic, and atactic polymers, and describe how tacticity affects the physical properties of polymers.
