To make polyethylene, its monomer ethylene must first be synthesized from fossil fuels. Petroleum and natural gas are broken into smaller molecules through a process called steam cracking. During this process, fossil fuels are heated to temperatures up to 900°C. Large carbon-based molecules are broken apart, or "cracked," to produce small molecules like ethane. Once ethane is made, it decomposes due to the high temperatures to make hydrogen gas and ethylene.

Question

Select the true statements.

Answer 1

Based on the provided information about the synthesis of ethylene from fossil fuels, here are true statements related to the process:

1. Ethylene is synthesized from fossil fuels through steam cracking.
2. Petroleum and natural gas are used as feedstocks in the steam cracking process.
3. Steam cracking involves heating fossil fuels to high temperatures (up to 900°C).
4. The process breaks larger carbon-based molecules into smaller molecules.
5. Ethane is one of the small molecules produced during steam cracking.
6. Ethane decomposes at high temperatures to produce hydrogen gas and ethylene.

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