Question

when ethylene is made, it reacts with other ethylene monomers to make polyethylene.
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.
polyethylene is made of carbon and hydrogen.
many ethylene molecules are joined together to form polyethylene.
ethylene is a polymer.
hdpe is made of long side - by - side chains of polyethylene.

Explanation:

1. Polyethylene is a polymer composed of carbon - hydrogen chains. So, "Polyethylene is made of carbon and hydrogen" is true.
2. As shown in the description, ethylene monomers join to form polyethylene, so "Many ethylene molecules are joined together to form polyethylene" is true.
3. Ethylene is a monomer, not a polymer, so "Ethylene is a polymer" is false.
4. High - density polyethylene (HDPE) is made when long polyethylene chains line up side by side, so "HDPE is made of long side - by - side chains of polyethylene" is true.

Answer:

• Polyethylene is made of carbon and hydrogen.
• Many ethylene molecules are joined together to form polyethylene.
• HDPE is made of long side - by - side chains of polyethylene.