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💏intro to chemistry review

C2H4

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

C2H4, commonly known as ethylene, is a colorless gas with a sweet odor that is a key hydrocarbon compound. It is an unsaturated hydrocarbon, meaning it contains at least one double bond between carbon atoms. Ethylene plays a vital role in the production of plastics and serves as a plant hormone, influencing growth and ripening processes.

5 Must Know Facts For Your Next Test

  1. Ethylene is the simplest alkene, consisting of two carbon atoms and four hydrogen atoms.
  2. It is produced in significant quantities through the steam cracking of hydrocarbons, often derived from natural gas or petroleum.
  3. Ethylene is an important precursor in the synthesis of various chemicals, including antifreeze, solvents, and detergents.
  4. In agriculture, ethylene is used to regulate the ripening of fruits and vegetables, making it essential for food preservation and distribution.
  5. As a greenhouse gas, ethylene contributes to the environmental impact of certain agricultural practices due to its role in plant growth.

Review Questions

  • How does the structure of C2H4 classify it as an alkene, and what are the implications of this classification?
    • C2H4's structure includes a carbon-carbon double bond, which classifies it as an alkene. This double bond allows for unique chemical reactivity compared to alkanes, which are saturated hydrocarbons without double bonds. The presence of this double bond makes C2H4 more reactive, enabling it to participate in various chemical reactions like polymerization to form plastics.
  • What role does C2H4 play in both industrial applications and agriculture, and why is it significant in these contexts?
    • C2H4 serves multiple roles across industries; it's primarily used as a building block in producing polyethylene and other important chemicals. In agriculture, it's recognized as a plant hormone that promotes fruit ripening. Its significance lies in its dual function: contributing to material production while also impacting food supply chains through its influence on agricultural practices.
  • Evaluate the environmental implications of using C2H4 in agriculture and industry. What measures can be taken to mitigate negative effects?
    • The use of C2H4 can lead to increased greenhouse gas emissions and potential disruptions in local ecosystems due to its role as a plant hormone. In industry, improper management of ethylene production can result in air pollution. To mitigate these effects, industries can adopt cleaner production technologies and implement regulations on emissions while farmers can use ethylene applications judiciously to minimize environmental impact.