Polymers and carbohydrates - some basics

What type of reaction is involved in condensation polymerisation?

• Addition reaction

• Condensation reaction

• Decomposition reaction

• Substitution reaction

What is the general equation for the production of polyethene?

• n(CH2=CH2) → —CH2—CH2—CH2—CH2—

• n(CH2=CH2) → —CH2—CH2—CH2—CH2—CH2—CH2—

• n(CH2=CH2) → —CH2—CH2—CH2—CH2—CH2—

• n(CH2=CH2) → —CH2—CH2—CH2—CH2—CH2—CH2—CH2—

What is the main use of polyethene after its discovery?

• Electrical insulation for high-frequency radar cables

• Construction material

• Food packaging

• Textile manufacturing

What is the effect of stronger bonding in HDPE?

• Lower melting point

• Higher flexibility

• Higher melting point

• Lower density

What is the typical temperature used in the Ziegler–Natta process for HDPE production?

• 30°C

• 60°C

• 90°C

• 120°C

What is the common use of polytetrafluoroethene (PTFE)?

• Milk bottles, soft toys, plastic wrap (cling wrap)

• Kitchen utensils and containers, more rigid toys, rubbish bins, tougher carry bags

• Car bumpers, rope and twine, household goods, moulded chairs, carpets

• High-grade electrical insulation, non-stick surfaces on cookware, pipe thread sealant

Which two functional groups are at the ends of lactic acid (2-hydroxypropanoic acid)?

• Hydroxyl (—OH)

• Carboxyl (—COOH)

• Amino (—NH2)

• Methyl (—CH3)

Which of the following is used to make biodegradable surgical sutures?

• Polyethylene

• Polypropylene

• Poly(lactic acid)

• Polystyrene

What happens to the functional groups at each end of a dipeptide?

• They become inactive

• They continue to react with other amino acids

• They form a ring structure

• They are removed

What is the result when long chains of amino acid units join together?

• Monopeptide

• Dipeptide

• Tripeptide

• Polypeptide