Question

long polyethylene chains can be arranged in different ways. if these chains line up side by side, high - density polyethylene, or hdpe, is made. select the true statements. long side - by - side chains of polyethylene combine to form hdpe. polyethylene is made of many units of hdpe. ethylene is a monomer. polyethylene is made of carbon and oxygen.

Explanation:

1. The text states that long side - by - side chains of polyethylene form HDPE, so the first statement is true.
2. HDPE is a type of polyethylene, not the other way around, so "Polyethylene is made of many units of HDPE" is false.
3. Ethylene is the monomer that polymerizes to form polyethylene, so "Ethylene is a monomer" is true.
4. Polyethylene is made of carbon and hydrogen, not carbon and oxygen, so the last statement is false.

Answer:

Long side - by - side chains of polyethylene combine to form HDPE.
Ethylene is a monomer.