Which term is a colorless syrupy alcohol used as an antifreeze?

Which term is a colorless syrupy alcohol used as an antifreeze?

• A. Ethyl chloride
• B. Ethylene glycol
• C. Ethane
• D. Ethylamine

Answer: (B)

The concept tested is identifying a chemical commonly used as antifreeze by its physical description. Ethylene glycol is a colorless, syrupy liquid that contains two hydroxyl groups, making it a diol. This structure allows it to mix with water and drastically lower the freezing point of the mixture, which is why it’s used in engine coolants as antifreeze. It’s viscous and has a sweet taste, properties that historically contributed to its widespread use, though it is toxic if ingested. The other substances don’t fit the description: ethyl chloride is a volatile compound used as a local anesthetic, not an antifreeze; ethane is a simple hydrocarbon gas used as a fuel or chemical feedstock; ethylamine is an amine, not an alcohol, and likewise isn’t used as antifreeze.

The concept tested is identifying a chemical commonly used as antifreeze by its physical description. Ethylene glycol is a colorless, syrupy liquid that contains two hydroxyl groups, making it a diol. This structure allows it to mix with water and drastically lower the freezing point of the mixture, which is why it’s used in engine coolants as antifreeze. It’s viscous and has a sweet taste, properties that historically contributed to its widespread use, though it is toxic if ingested.

The other substances don’t fit the description: ethyl chloride is a volatile compound used as a local anesthetic, not an antifreeze; ethane is a simple hydrocarbon gas used as a fuel or chemical feedstock; ethylamine is an amine, not an alcohol, and likewise isn’t used as antifreeze.