Which statement about the disposal of waste plastics is correct?
A) They are put in landfill sites, where they quickly decompose.
B) They are burned to produce non-toxic products.
C) They accumulate in oceans, where they are harmful to aquatic life.
D) They are dissolved in water and pumped into the sea.
▶️ Answer/Explanation
Ans: C
Let’s evaluate each statement:
A) Incorrect – Plastics decompose very slowly in landfills, often taking hundreds of years.
B) Incorrect – Burning plastics typically produces toxic gases and pollutants, unless done under very controlled conditions.
C) Correct – Plastic waste does accumulate in oceans, forming things like the Great Pacific Garbage Patch, and harms marine life through ingestion and entanglement.
D) Incorrect – Most plastics are not water-soluble and this is not a standard disposal method.
Option C is the only completely accurate statement about plastic disposal issues.
Question
Polymers are long-chain molecules made from small molecules linked together. Four polymers or types of polymer are listed.
1 carbohydrates
2 nylon
3 proteins
4 Terylene
Which polymers or types of polymer are synthetic?
A. 1 and 3 B. 1 and 4 C. 2 and 3 D. 2 and 4
Answer/Explanation
Ans:
D
Question
Which polymers or types of polymer are synthetic?
1 carbohydrates
2 nylon
3 proteins
4 Terylene
A 1 and 3
B 1 and 4
C 2 and 3
D 2 and 4
▶️Answer/Explanation
Ans:D
Question
Molecule 1 undergoes a process to make molecule 2.
Answer/Explanation
Ans: B