Chem 1E polymers

Which of the following is a natural polymer?

• • Polyethylene

• • Cellulose

• • Polyvinyl chloride

• • Nylon

The process of linking smaller molecules to form a large polymer chain is called:

• • Depolymerization

• • Polymerization

• • Catalysis

• • Crystallization

What type of polymer structure consists of long, flexible chains without branching?

• • Branched

• • Cross-linked

• • Linear

• • Network

Which of the following is an example of a cross-linked polymer?

• Polyethylene

• Polystyrene

• Epoxy

• Polyvinyl chloride

Which term describes the average number of repeat units in a polymer chain?

• Molecular weight

• Degree of polymerization

• Weight fraction

• Configuration

Which polymer configuration has the CH₃ group and H positioned on opposite sides of the double bond?

• Cis

• Trans

• Branched

• Cross-linked

The primary difference between a cis and trans isomer of a polymer is:

• The size of the molecules

• The strength of their covalent bonds

• The orientation of groups around the double bond

• The number of monomers

Which type of polymer typically forms a three-dimensional network with multifunctional monomers?

• Linear

• Branched

• Cross-linked

• Network

A polymer sample has the following molecular weight distribution for its chains:

• Chain A: 1000 g/mol, 30% of the total chains

• Chain B: 2000 g/mol, 50% of the total chains

• Chain C: 3000 g/mol, 20% of the total chains

What is the number-average molecular weight (Mn​) of the polymer?

• • 1500 g/mol

• • 1900 g/mol

• • 2100 g/mol

• • 2500 g/mol

A polymer has a molecular weight of 15,000 g/mol, and each repeat unit in the polymer chain has a molecular weight of 75 g/mol. What is the degree of polymerization (DP) for this polymer?

• • 150

• • 200

• • 300

• • 350