Ketones can evaporate in cooler temperatures.

• A. Sometimes
• B. True
• C. False
• D. Never

Answer: (B)

Evaporation depends on a liquid’s volatility and its vapor pressure at a given temperature. Ketones are relatively volatile, with measurable vapor pressure even at room temperature, so they can and do evaporate when temperatures are not high. The rate is slower in cooler conditions, but evaporation still occurs rather than being completely prevented. That’s why the statement is true. To minimize vapor exposure, keep ketones in tightly sealed containers and work in a well-ventilated area.