M6/8 Chemistry Revision Questions

Which of the following is NOT a biodegradable plastic?

• Polyamide

• Polyester

• Polyethylene

• Polyvinyl chloride

Casein in milk can be cross-linked to produce biodegradable plastics. Which of the following is/are the application of this process?

• Buttons

• Hair combs

• Drinking bottles

• Ropes

Which pair of polymer is non-biodegradable?

• Isoprene and neoprene

• Polyamide and silicone

• Polyethylene and neoprene

• Polyester and isoprene

Which pair of polymer is biodegradable?

• Polyethylene and neoprene

• Isoprene and neoprene

• Polyamide and silicone

• Isoprene and polyester

What happens to a vulcanized rubber?

• It hardens, and improves non-viscosity and non-stickiness

• It softens, and improves resilience, non-stickiness and tensile strength.

• It hardens, and improves viscosity and non-stickiness

Which of the following best describes vulcanization?

• Heating rubber with sulfur

• Heating rubber with borax

• Heating milk and mixing with Carboxylic acid

Which of the following is TRUE in making plastics from milk?

• Casein in milk unfolds upon heating and cross-linked with Carboxylic acid.

• Carboxylic acid is cross-linked with heated casein in milk.

• Casein in milk is boiled to break into monomers and combine with Carboxylic acid to make plastic polymers with water.

Which of the following statements is correct?

• Latex is a natural rubber while rubber from petroleum byproduct is synthetic.

• Latex and rubber from petroleum byproducts are both synthetic rubber.

• Condensation polymer is synthetic while addition polymer is a natural polymer.

• All synthetic polymers are made from condensation Polymerization.

Which of the following is Correct?

• Thermoplastic is a branched polymer while thermoset plastic is a linear polymer.

• Thermoset softens when heated while thermoplastic hardens when heated.

• Thermoset plastics are recyclable while thermoplastic is non-recyclable.

• Thermoset is liquid at room temperature while thermoplastic is solid at room temperature.

Which of the following statements is correct?

• Biodegradable plastics are polar molecules while non-biodegradable plastics are non-polar molecules.

• Low-density plastics have linear polymers

• High-density plastics have branched or cross-linked polymers.

• Biodegradable plastics have non-polar molecules while non-biodegradable plastics have polar molecules.