Polymers and Environmental Impact

This video tutorial covers addition polymerization, explaining how alkenes form polymers by breaking pi bonds and joining monomer units. It demonstrates drawing repeat units and naming polymers, with examples like polypropylene and polytetrafluoroethylene. The video includes typical exam questions and discusses environmental issues with non-biodegradable polymers. It explores waste management methods, such as recycling and energy recovery, and highlights the future of polymers, emphasizing sustainable alternatives like bioplastics.

What happens to the pi bond in the carbon-carbon double bond during addition polymerization?

• It converts into a single bond without joining monomers.

• It breaks, allowing monomers to join.

• It forms a triple bond.

• It remains intact.

How is the polymer formed from propane named?

• Polytetrafluoroethylene

• Polyethene

• Polypropylene

• Polypropane

What is the first step in converting a polymer chain back to its monomer?

• Adding more monomers

• Breaking the polymer into smaller chains

• Removing the end bonds and restoring the double bond

• Heating the polymer

Which of the following is a major environmental concern regarding polymers?

• They are not versatile enough for various applications.

• They are too reactive for safe use.

• They are non-biodegradable and persist in the environment.

• They are too expensive to produce.

What is one method of dealing with waste polymers?

• Burying them in landfills

• Dumping them in oceans

• Energy recovery through incineration

• Burning them without energy recovery

What is feedstock recycling?

• Turning polymers into energy

• Converting polymers back into their original monomers

• Burning polymers for heat

• Using polymers as fertilizers

What is a characteristic of biodegradable polymers?

• They are resistant to all forms of degradation.

• They contain an OH group that helps them break down.

• They are made from synthetic materials only.

• They are made from metals.

What is the role of additives in photodegradable plastics?

• They make the plastic more durable.

• They absorb light, causing the bonds to weaken.

• They make the plastic heavier.

• They prevent the plastic from absorbing light.

What is the main advantage of using renewable resources for future polymers?

• They are more reactive.

• They are infinite and sustainable.

• They are easier to process.

• They are cheaper than crude oil.

What is a common mistake when burning chlorine-based polymers like PVC?

• Assuming they are non-toxic.

• Assuming they release hydrogen chloride.

• Assuming they release chlorine gas.

• Assuming they are biodegradable.