🔍 Key Concepts
• Chemical Data Guide for Bulk Shipment by Water physical description entries (color, state, odor)
• How unsaturated hydrocarbons like dienes (e.g., pentadiene) are typically described (colorless vs colored)
• Difference between odor intensity terms: faint, mild, strong, aromatic, sweet
đź’ Think About
• Think about how many light hydrocarbon liquids are described in terms of color in the Chemical Data Guide: are they usually colored or colorless?
• Compare the words used to describe the smell: which options describe a clearly strong, distinctive odor and which describe something weaker or less noticeable?
• Eliminate any choices that suggest properties that are uncommon for simple C5 dienes shipped in bulk (e.g., unusual color or highly characteristic aromatic odor)
âś… Before You Answer
• Verify whether 1,3-pentadiene is listed as colorless or some shade like pale yellow/straw-colored in the Chemical Data Guide entry
• Check the odor descriptor used: faint, mild, strong, aromatic, sweet – make sure it matches the Guide’s wording, not what you might expect from the name
• Confirm you are looking at 1,3-pentadiene, not another pentadiene isomer or similar-sounding substance