Polymer Chemistry: Structure, Properties, and Applications

Question 1

Which characteristic is typical of polymers?

Accepted Answer

High molecular weight

Answer

Low melting point

Answer

Good electrical conductivity

Answer

Low strength

Question 2

In which type of polymerization is a chain-like molecule formed by the sequential addition of monomers?

Accepted Answer

Addition polymerization

Answer

Condensation polymerization

Answer

Ring-opening polymerization

Answer

Cross-linking polymerization

Question 3

What is the primary effect of cross-linking in polymers?

Accepted Answer

Increased rigidity

Answer

Increased flexibility

Answer

Decreased molecular weight

Answer

Decreased solubility

Question 4

What is the structural characteristic of a copolymer?

Accepted Answer

Formed from two or more different monomers

Answer

Cross-linked

Answer

Amorphous

Answer

Crystalline

Question 5

In which application are polymers primarily utilized for their electrical insulating properties?

Accepted Answer

Electrical wires

Answer

Medical devices

Answer

Automotive parts

Answer

Food packaging

Question 6

Identify the monomer from which polyethylene is synthesized.

Accepted Answer

Ethylene

Answer

Propylene

Answer

Styrene

Answer

Vinyl chloride

Question 7

Which type of polymer is commonly used for biodegradable applications?

Accepted Answer

Polyvinyl alcohol

Answer

Polyethylene

Answer

Polystyrene

Answer

Polyethylene terephthalate

Question 8

What is the intended effect of adding a plasticizer to a polymer?

Accepted Answer

Increased flexibility

Answer

Increased strength

Answer

Increased melting point

Answer

Decreased crystallinity

Question 9

To determine the molecular weight distribution of polymers, which technique is specifically employed?

Accepted Answer

Gel permeation chromatography

Answer

Atomic emission spectroscopy

Answer

Nuclear magnetic resonance spectroscopy

Question 10

The degree of polymerization (DP) represents the:

Accepted Answer

Average chain length of a polymer

Answer

Molecular weight of a polymer

Answer

Crystallinity of a polymer

Answer

Monomer composition of a polymer

Question 11

Which type of polymer is known for its elasticity and low electrical conductivity?

Accepted Answer

Natural rubber

Answer

Polyethylene

Answer

Polystyrene

Answer

Polyvinyl chloride

Question 12

Which of the following polymers is biodegradable?

Accepted Answer

Polylactic acid

Answer

Polyethylene

Answer

Polypropylene

Answer

Polystyrene

Question 13

Which of the following is NOT a type of polymer?

Accepted Answer

Crystalline

Answer

Thermoplastic

Answer

Thermosetting

Answer

Elastomer

Question 14

The molecular weight of a polymer is typically expressed in:

Accepted Answer

Daltons

Answer

Grams per mole

Answer

Kilograms per cubic meter

Answer

Pascals

Question 15

Which of the following polymers is commonly used in the production of plastic bottles?

Accepted Answer

Polyethylene terephthalate (PET)

Answer

Polyvinyl chloride (PVC)

Answer

Polypropylene (PP)

Answer

Polystyrene (PS)

Question 16

The degree of polymerization of a polymer is defined as the:

Accepted Answer

Average number of repeating units in the polymer chain

Answer

Molecular weight of the polymer

Answer

Density of the polymer

Answer

Glass transition temperature of the polymer

Question 17

The glass transition temperature of a polymer is the temperature at which the polymer:

Accepted Answer

Changes from a glassy state to a rubbery state

Answer

Melts

Answer

Decomposes

Answer

Crystallizes

Question 18

How do functional groups within a polymer chain affect its overall properties?

Accepted Answer

They influence the polymer's solubility and polarity.

Answer

They only change the polymer's color.

Answer

They have no impact on polymer properties.

Answer

They always increase the polymer's strength and stiffness.

Question 19

What is the glass transition temperature (Tg) of a polymer?

Accepted Answer

Temperature at which a polymer transitions from a glassy to a rubbery state

Answer

Temperature at which a polymer melts

Answer

Temperature at which a polymer crosslinks

Question 20

What is the monomer for polyvinyl chloride (PVC)?

Accepted Answer

Vinyl chloride

Answer

Tetrafluoroethylene

Answer

Ethylene

Answer

Propylene

Question 21

Which of the following is NOT an application of polymers in the construction industry?

Accepted Answer

Artificial joints

Answer

Windows frames

Answer

Insulation

Answer

Pipes

Question 22

Which of the following is a synthetic polymer?

Accepted Answer

Polyethylene

Answer

Rubber

Answer

Cellulose

Answer

Starch

Question 23

What is the difference between a homopolymer and a copolymer?

Accepted Answer

Homopolymer consists of one type of repeating unit, while a copolymer consists of two or more different types of repeating units.

Answer

Copolymers have lower molecular weights than homopolymers.

Answer

Homopolymers are always crystalline, while copolymers are always amorphous.