Question

questions 1. which of the following lists include three man - made polymers? a. silk, natural rubber, plastic b. man - made rubber, sugar, silk c. plastic, nylon, man - made rubber d. sugar, silk, nylon 2. plastics are made from which of the following? a. glass b. petroleum c. natural plastics d. wood and other natural fibers 3. what is true of thermoset plastics? a. they are often used in automobile parts. b. they do not hold their shape well. c. they may be reformed over and over again. d. they are often used to make plastic baggies. 4. what do plastics coded as #1, #3, #6, and #7 have in common? a. they are all biodegradable. b. they are all choking hazards. c. they are classified as the safest of the coded plastics. d. they can leach toxic chemicals. 5. what are some detrimental consequences of widespread plastic usage? a. less recycling. b. links to cancer and pollution. c. public awareness and cooperation. d. higher crime rates.

Explanation:

Question 1

• Silk and natural rubber are natural polymers. Plastic, nylon, and man - made rubber are man - made polymers.

Question 2

• Plastics are made from petroleum through processes like polymerization. Glass is a non - polymer material, natural plastics are not the source (plastics are synthetic), and wood and natural fibers are not the base for most common plastics.

Question 3

• Thermoset plastics are often used in automobile parts as they have good mechanical properties. They hold their shape well (opposite of option b), cannot be reformed (opposite of option c), and plastic baggies are usually made from thermoplastics (opposite of option d).

Question 4

• Plastics coded as #1 (PETE), #3 (PVC), #6 (PS), and #7 (other) can leach toxic chemicals. They are not all biodegradable. Choking hazard is not a common property for these codes as a group. They are not the safest (for example, PVC is known for its toxicity issues).

Question 5

• Widespread plastic usage has links to cancer (due to leaching of chemicals like some from PVC) and pollution (e.g., land and water pollution). Less recycling is more of a consequence of other factors (like lack of infrastructure) rather than a direct detrimental consequence of usage. Public awareness is a positive thing (not a detrimental consequence), and there is no direct link between plastic usage and higher crime rates.

Answer:

1. c. Plastic, nylon, man - made rubber
2. b. Petroleum
3. a. They are often used in automobile parts.
4. d. They can leach toxic chemicals.
5. b. Links to cancer and pollution.